feature: ARSN-150 add missing constants

add missing is
2022-04-25 14:11:09 -07:00 · 2022-04-22 10:56:35 -07:00 · 2022-04-21 15:28:21 -07:00 · 2022-04-21 12:43:44 -07:00 · 2022-04-21 11:54:18 -07:00 · 2022-04-18 09:01:34 -07:00
388 changed files with 22289 additions and 44284 deletions
--- a/.eslintrc
+++ b/.eslintrc
@ -1,6 +1 @@
-{
-    "extends": "scality",
-    "parserOptions": {
-        "ecmaVersion": 2020
-    }
-}
+{ "extends": "scality" }
--- a/.github/workflows/codeql.yaml
+++ b/.github/workflows/codeql.yaml
@ -1,25 +0,0 @@
---
-name: codeQL
-
-on:
-  push:
-    branches: [development/*, stabilization/*, hotfix/*]
-  pull_request:
-    branches: [development/*, stabilization/*, hotfix/*]
-  workflow_dispatch:
-
-jobs:
-  analyze:
-    name: Static analysis with CodeQL
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout code
-        uses: actions/checkout@v4
-
-      - name: Initialize CodeQL
-        uses: github/codeql-action/init@v3
-        with:
-          languages: javascript, typescript
-
-      - name: Build and analyze
-        uses: github/codeql-action/analyze@v3
--- a/.github/workflows/dependency-review.yaml
+++ b/.github/workflows/dependency-review.yaml
@ -1,16 +0,0 @@
---
-name: dependency review
-
-on:
-  pull_request:
-    branches: [development/*, stabilization/*, hotfix/*]
-
-jobs:
-  dependency-review:
-    runs-on: ubuntu-latest
-    steps:
-      - name: 'Checkout Repository'
-        uses: actions/checkout@v4
-
-      - name: 'Dependency Review'
-        uses: actions/dependency-review-action@v4
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@ -25,30 +25,24 @@ jobs:
          - 6379:6379
    steps:
    - name: Checkout
-      uses: actions/checkout@v4
-    - uses: actions/setup-node@v4
+      uses: actions/checkout@v2
+    - uses: actions/setup-node@v2
      with:
        node-version: '16'
        cache: 'yarn'
    - name: install dependencies
-      run: yarn install --frozen-lockfile --prefer-offline --network-concurrency 1
+      run: yarn install --frozen-lockfile --prefer-offline
      continue-on-error: true # TODO ARSN-97 Remove it when no errors in TS
    - name: lint yaml
      run: yarn --silent lint_yml
    - name: lint javascript
-      run: yarn --silent lint --max-warnings 0
+      run: yarn --silent lint -- --max-warnings 0
    - name: lint markdown
      run: yarn --silent lint_md
-    - name: add hostname
-      run: |
-        sudo sh -c "echo '127.0.0.1 testrequestbucket.localhost' >> /etc/hosts"
-    - name: test and coverage
-      run: yarn --silent coverage
+    - name: run unit tests
+      run: yarn test
    - name: run functional tests
      run: yarn ft_test
-    - uses: codecov/codecov-action@v4
-      with:
-        token: ${{ secrets.CODECOV_TOKEN }}
    - name: run executables tests
      run: yarn install && yarn test
      working-directory: 'lib/executables/pensieveCreds/'
@ -59,9 +53,9 @@ jobs:
    runs-on: ubuntu-latest
    steps:
    - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@v2
    - name: Install NodeJS
-      uses: actions/setup-node@v4
+      uses: actions/setup-node@v2
      with:
        node-version: '16'
        cache: yarn
@ -72,7 +66,7 @@ jobs:
      run: yarn build
      continue-on-error: true # TODO ARSN-97 Remove it when no errors in TS
    - name: Upload artifacts
-      uses: scality/action-artifacts@v4
+      uses: scality/action-artifacts@v2
      with:
        url: https://artifacts.scality.net
        user: ${{ secrets.ARTIFACTS_USER }}
--- a/.swcrc
+++ b/.swcrc
@ -1,12 +0,0 @@
-{
-  "$schema": "https://swc.rs/schema.json",
-  "jsc": {
-    "parser": {
-      "syntax": "typescript"
-    },
-    "target": "es2017"
-  },
-  "module": {
-    "type": "commonjs"
-  }
-}
--- a/README.md
+++ b/README.md
@ -1,7 +1,5 @@
 # Arsenal

-[![codecov](https://codecov.io/gh/scality/Arsenal/branch/development/8.1/graph/badge.svg?token=X0esXhJSwb)](https://codecov.io/gh/scality/Arsenal)
-
 Common utilities for the S3 project components

 Within this repository, you will be able to find the shared libraries for the
--- a/documentation/BucketInfoModelVersion.md
+++ b/documentation/BucketInfoModelVersion.md
@ -85,66 +85,6 @@ Used to store the bucket lifecycle configuration info

 ### Properties Added

-```javascript
-this._uid = uid || uuid();
-```
-
-### Usage
-
-Used to set a unique identifier on a bucket
-
-## Model version 8
-
-### Properties Added
-
-```javascript
-this._readLocationConstraint = readLocationConstraint || null;
-```
-
-### Usage
-
-Used to store default read location of the bucket
-
-## Model version 9
-
-### Properties Added
-
-```javascript
-this._isNFS = isNFS || null;
-```
-
-### Usage
-
-Used to determine whether the bucket may be accessed through NFS
-
-## Model version 10
-
-### Properties Added
-
-```javascript
-this._ingestion = ingestionConfig || null;
-```
-
-### Usage
-
-Used to store the ingestion status of a bucket
-
-## Model version 11
-
-### Properties Added
-
-```javascript
-this._azureInfo = azureInfo || null;
-```
-
-### Usage
-
-Used to store Azure storage account specific information
-
-## Model version 12
-
-### Properties Added
-
 ```javascript
 this._objectLockEnabled = objectLockEnabled || false;
 this._objectLockConfiguration = objectLockConfiguration || null;
@ -155,7 +95,7 @@ this._objectLockConfiguration = objectLockConfiguration || null;
 Used to determine whether object lock capabilities are enabled on a bucket and
 to store the object lock configuration of the bucket

-## Model version 13
+## Model version 8

 ### Properties Added

@ -167,7 +107,7 @@ this._notificationConfiguration = notificationConfiguration || null;

 Used to store the bucket notification configuration info

-## Model version 14
+## Model version 9

 ### Properties Added

@ -179,7 +119,19 @@ this._serverSideEncryption.configuredMasterKeyId = configuredMasterKeyId || unde

 Used to store the users configured KMS key id

-## Model version 15
+## Model version 10
+
+### Properties Added
+
+```javascript
+this._uid = uid || uuid();
+```
+
+### Usage
+
+Used to set a unique identifier on a bucket
+
+## Model version 11

 ### Properties Added

@ -187,74 +139,6 @@ Used to store the users configured KMS key id
 this._tags = tags || null;
 ```

-The Tag Set of a bucket is an array of objects with Key and Value:
-
-```javascript
-[
-    {
-        Key: 'something',
-        Value: 'some_data'
-    }
-]
-```
-
-## Model version 16
-
-### Properties Added
-
-```javascript
-this._capabilities = capabilities || undefined;
-```
-
-For capacity-enabled buckets, contains the following data:
-
-```javascript
-{
-    _capabilities: {
-        VeeamSOSApi?: {
-            SystemInfo?: {
-                ProtocolVersion: String,
-                ModelName: String,
-                ProtocolCapabilities: {
-                    CapacityInfo: Boolean,
-                    UploadSessions: Boolean,
-                    IAMSTS: Boolean,
-                },
-                APIEndpoints: {
-                    IAMEndpoint: String,
-                    STSEndpoint: String,
-                },
-                SystemRecommendations?: {
-                    S3ConcurrentTaskLimit: Number,
-                    S3MultiObjectDelete: Number,
-                    StorageCurrentTasksLimit: Number,
-                    KbBlockSize: Number,
-                }
-                LastModified?: String,
-            },
-            CapacityInfo?: {
-                Capacity: Number,
-                Available: Number,
-                Used: Number,
-                LastModified?: String,
-            },
-        }
-    },
-}
-```
-
 ### Usage

 Used to store bucket tagging
-
-## Model version 17
-
-### Properties Added
-
-```javascript
-this._quotaMax = quotaMax || 0;
-```
-
-### Usage
-
-Used to store bucket quota
--- a/documentation/listingAlgos/delimiter.md
+++ b/documentation/listingAlgos/delimiter.md
@ -1,27 +0,0 @@
-# Delimiter
-
-The Delimiter class handles raw listings from the database with an
-optional delimiter, and fills in a curated listing with "Contents" and
-"CommonPrefixes" as a result.
-
-## Expected Behavior
-
- only lists keys belonging to the given **prefix** (if provided)
-
- groups listed keys that have a common prefix ending with a delimiter
-  inside CommonPrefixes
-
- can take a **marker** or **continuationToken** to list from a specific key
-
- can take a **maxKeys** parameter to limit how many keys can be returned
-
-## State Chart
-
- States with grey background are *Idle* states, which are waiting for
-  a new listing key
-
- States with blue background are *Processing* states, which are
-  actively processing a new listing key passed by the filter()
-  function
-
-![Delimiter State Chart](./pics/delimiterStateChart.svg)
--- a/documentation/listingAlgos/delimiterMaster.md
+++ b/documentation/listingAlgos/delimiterMaster.md
@ -1,45 +0,0 @@
-# DelimiterMaster
-
-The DelimiterMaster class handles raw listings from the database of a
-versioned or non-versioned bucket with an optional delimiter, and
-fills in a curated listing with "Contents" and "CommonPrefixes" as a
-result.
-
-## Expected Behavior
-
- only lists latest versions of versioned buckets
-
- only lists keys belonging to the given **prefix** (if provided)
-
- does not list latest versions that are delete markers
-
- groups listed keys that have a common prefix ending with a delimiter
-  inside CommonPrefixes
-
- can take a **marker** or **continuationToken** to list from a specific key
-
- can take a **maxKeys** parameter to limit how many keys can be returned
-
- reconciles internal PHD keys with the next version (those are
-  created when a specific version that is the latest version is
-  deleted)
-
- skips internal keys like replay keys
-
-## State Chart
-
- States with grey background are *Idle* states, which are waiting for
-  a new listing key
-
- States with blue background are *Processing* states, which are
-  actively processing a new listing key passed by the filter()
-  function
-
-### Bucket Vformat=v0
-
-![DelimiterMaster State Chart for v0 format](./pics/delimiterMasterV0StateChart.svg)
-
-### Bucket Vformat=v1
-
-For buckets in versioning key format **v1**, the algorithm used is the
-one from [Delimiter](delimiter.md).
--- a/documentation/listingAlgos/delimiterVersions.md
+++ b/documentation/listingAlgos/delimiterVersions.md
@ -1,33 +0,0 @@
-# DelimiterVersions
-
-The DelimiterVersions class handles raw listings from the database of a
-versioned or non-versioned bucket with an optional delimiter, and
-fills in a curated listing with "Versions" and "CommonPrefixes" as a
-result.
-
-## Expected Behavior
-
- lists individual distinct versions of versioned buckets
-
- only lists keys belonging to the given **prefix** (if provided)
-
- groups listed keys that have a common prefix ending with a delimiter
-  inside CommonPrefixes
-
- can take a **keyMarker** and optionally a **versionIdMarker** to
-  list from a specific key or version
-
- can take a **maxKeys** parameter to limit how many keys can be returned
-
- skips internal keys like replay keys
-
-## State Chart
-
- States with grey background are *Idle* states, which are waiting for
-  a new listing key
-
- States with blue background are *Processing* states, which are
-  actively processing a new listing key passed by the filter()
-  function
-
-![DelimiterVersions State Chart](./pics/delimiterVersionsStateChart.svg)
--- a/documentation/listingAlgos/pics/delimiterMasterV0StateChart.dot
+++ b/documentation/listingAlgos/pics/delimiterMasterV0StateChart.dot
@ -1,45 +0,0 @@
-digraph {
-  node [shape="box",style="filled,rounded",fontsize=16,fixedsize=true,width=3];
-  edge [fontsize=14];
-  rankdir=TB;
-
-  START [shape="circle",width=0.2,label="",style="filled",fillcolor="black"]
-  END [shape="circle",width=0.2,label="",style="filled",fillcolor="black",peripheries=2]
-
-  node [fillcolor="lightgrey"];
-  "NotSkippingPrefixNorVersions.Idle" [label="NotSkippingPrefixNorVersions",group="NotSkippingPrefixNorVersions",width=4];
-  "SkippingPrefix.Idle" [label="SkippingPrefix",group="SkippingPrefix"];
-  "SkippingVersions.Idle" [label="SkippingVersions",group="SkippingVersions"];
-  "WaitVersionAfterPHD.Idle" [label="WaitVersionAfterPHD",group="WaitVersionAfterPHD"];
-
-  node [fillcolor="lightblue"];
-  "NotSkippingPrefixNorVersions.Processing" [label="NotSkippingPrefixNorVersions",group="NotSkippingPrefixNorVersions",width=4];
-  "SkippingPrefix.Processing" [label="SkippingPrefix",group="SkippingPrefix"];
-  "SkippingVersions.Processing" [label="SkippingVersions",group="SkippingVersions"];
-  "WaitVersionAfterPHD.Processing" [label="WaitVersionAfterPHD",group="WaitVersionAfterPHD"];
-
-  START -> "SkippingVersions.Idle" [label="[marker != undefined]"]
-  START -> "NotSkippingPrefixNorVersions.Idle" [label="[marker == undefined]"]
-
-  "NotSkippingPrefixNorVersions.Idle" -> "NotSkippingPrefixNorVersions.Processing" [label="filter(key, value)"]
-  "SkippingPrefix.Idle" -> "SkippingPrefix.Processing" [label="filter(key, value)"]
-  "SkippingVersions.Idle" -> "SkippingVersions.Processing" [label="filter(key, value)"]
-  "WaitVersionAfterPHD.Idle" -> "WaitVersionAfterPHD.Processing" [label="filter(key, value)"]
-
-
-  "NotSkippingPrefixNorVersions.Processing" -> "SkippingVersions.Idle" [label="[Version.isDeleteMarker(value)]\n-> FILTER_ACCEPT"]
-  "NotSkippingPrefixNorVersions.Processing" -> "WaitVersionAfterPHD.Idle" [label="[Version.isPHD(value)]\n-> FILTER_ACCEPT"]
-  "NotSkippingPrefixNorVersions.Processing" -> "SkippingPrefix.Idle" [label="[key.startsWith(<ReplayPrefix>)]\n/ prefix <- <ReplayPrefix>\n-> FILTER_SKIP"]
-  "NotSkippingPrefixNorVersions.Processing" -> END [label="[isListableKey(key, value) and\nKeys == maxKeys]\n-> FILTER_END"]
-  "NotSkippingPrefixNorVersions.Processing" -> "SkippingPrefix.Idle" [label="[isListableKey(key, value) and\nnKeys < maxKeys and\nhasDelimiter(key)]\n/ prefix <- prefixOf(key)\n/ CommonPrefixes.append(prefixOf(key))\n-> FILTER_ACCEPT"]
-  "NotSkippingPrefixNorVersions.Processing" -> "SkippingVersions.Idle" [label="[isListableKey(key, value) and\nnKeys < maxKeys and\nnot hasDelimiter(key)]\n/ Contents.append(key, value)\n-> FILTER_ACCEPT"]
-
-  "SkippingPrefix.Processing" -> "SkippingPrefix.Idle" [label="[key.startsWith(prefix)]\n-> FILTER_SKIP"]
-  "SkippingPrefix.Processing" -> "NotSkippingPrefixNorVersions.Processing" [label="[not key.startsWith(prefix)]"]
-
-  "SkippingVersions.Processing" -> "SkippingVersions.Idle" [label="[isVersionKey(key)]\n-> FILTER_SKIP"]
-  "SkippingVersions.Processing" -> "NotSkippingPrefixNorVersions.Processing" [label="[not isVersionKey(key)]"]
-
-  "WaitVersionAfterPHD.Processing" -> "NotSkippingPrefixNorVersions.Processing" [label="[isVersionKey(key) and master(key) == PHDkey]\n/ key <- master(key)"]
-  "WaitVersionAfterPHD.Processing" -> "NotSkippingPrefixNorVersions.Processing" [label="[not isVersionKey(key) or master(key) != PHDkey]"]
-}
--- a/documentation/listingAlgos/pics/delimiterMasterV0StateChart.svg
+++ b/documentation/listingAlgos/pics/delimiterMasterV0StateChart.svg
@ -1,216 +0,0 @@
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+++ b/documentation/listingAlgos/pics/delimiterVersionsStateChart.dot
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-  "SkippingPrefix.Idle" [label="SkippingPrefix",group="SkippingPrefix"];
-  "WaitForNullKey.Idle" [label="WaitForNullKey",group="WaitForNullKey"];
-  "SkippingVersions.Idle" [label="SkippingVersions",group="SkippingVersions"];
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-  "WaitForNullKey.Processing" [label="WaitForNullKey",group="WaitForNullKey"];
-  "SkippingVersions.Processing" [label="SkippingVersions",group="SkippingVersions"];
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-  "SkippingPrefix.Idle" -> "SkippingPrefix.Processing" [label="filter(key, value)"]
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-  "NotSkipping.Processing" -> "NotSkippingV0.Processing" [label="vFormat='v0'"]
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-  "WaitForNullKey.Processing" -> "NotSkipping.Processing" [label="master(key) != keyMarker"]
-  "WaitForNullKey.Processing" -> "SkippingVersions.Processing" [label="master(key) == keyMarker"]
-  "NotSkippingV0.Processing" -> "SkippingPrefix.Idle" [label="[key.startsWith(<ReplayPrefix>)]\n/ prefix <- <ReplayPrefix>\n-> FILTER_SKIP"]
-  "NotSkippingV0.Processing" -> "NotSkipping.Idle" [label="[Version.isPHD(value)]\n-> FILTER_ACCEPT"]
-  "NotSkippingV0.Processing" -> "NotSkippingCommon.Processing" [label="[not key.startsWith(<ReplayPrefix>)\nand not Version.isPHD(value)]"]
-  "NotSkippingV1.Processing" -> "NotSkippingCommon.Processing" [label="[always]"]
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-  "SkippingPrefix.Processing" -> "NotSkipping.Processing" [label="[not key.startsWith(prefix)]"]
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-  "SkippingVersions.Processing" -> "SkippingVersions.Idle" [label="master(key) === keyMarker and \nversionId < versionIdMarker\n-> FILTER_SKIP"]
-  "SkippingVersions.Processing" -> "SkippingVersions.Idle" [label="master(key) === keyMarker and \nversionId == versionIdMarker\n-> FILTER_ACCEPT"]
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--- a/greenkeeper.json
+++ b/greenkeeper.json
@ -1,28 +0,0 @@
-{
-  "groups": {
-    "default": {
-      "packages": [
-        "lib/executables/pensieveCreds/package.json",
-        "package.json"
-      ]
-    }
-  },
-  "branchPrefix": "improvement/greenkeeper.io/",
-  "commitMessages": {
-    "initialBadge": "docs(readme): add Greenkeeper badge",
-    "initialDependencies": "chore(package): update dependencies",
-    "initialBranches": "chore(bert-e): whitelist greenkeeper branches",
-    "dependencyUpdate": "fix(package): update ${dependency} to version ${version}",
-    "devDependencyUpdate": "chore(package): update ${dependency} to version ${version}",
-    "dependencyPin": "fix: pin ${dependency} to ${oldVersionResolved}",
-    "devDependencyPin": "chore: pin ${dependency} to ${oldVersionResolved}",
-    "closes": "\n\nCloses #${number}"
-  },
-  "ignore": [
-    "ajv",
-    "eslint",
-    "eslint-plugin-react",
-    "eslint-config-airbnb",
-    "eslint-config-scality"
-  ]
-}
--- a/index.ts
+++ b/index.ts
@ -1,105 +1,104 @@
-import * as evaluators from './lib/policyEvaluator/evaluator';
-import evaluatePrincipal from './lib/policyEvaluator/principal';
-import RequestContext, {
-    actionNeedQuotaCheck,
-    actionNeedQuotaCheckCopy,
-    actionWithDataDeletion } from './lib/policyEvaluator/RequestContext';
-import * as requestUtils from './lib/policyEvaluator/requestUtils';
-import * as actionMaps from './lib/policyEvaluator/utils/actionMaps';
-import { validateUserPolicy } from './lib/policy/policyValidator'
-import * as locationConstraints from './lib/patches/locationConstraints';
-import * as userMetadata from './lib/s3middleware/userMetadata';
-import convertToXml from './lib/s3middleware/convertToXml';
-import escapeForXml from './lib/s3middleware/escapeForXml';
-import * as objectLegalHold from './lib/s3middleware/objectLegalHold';
-import * as tagging from './lib/s3middleware/tagging';
-import { checkDateModifiedHeaders } from './lib/s3middleware/validateConditionalHeaders';
-import { validateConditionalHeaders } from './lib/s3middleware/validateConditionalHeaders';
-import MD5Sum from './lib/s3middleware/MD5Sum';
-import NullStream from './lib/s3middleware/nullStream';
-import * as objectUtils from './lib/s3middleware/objectUtils';
-import * as mpuUtils from './lib/s3middleware/azureHelpers/mpuUtils';
-import ResultsCollector from './lib/s3middleware/azureHelpers/ResultsCollector';
-import SubStreamInterface from './lib/s3middleware/azureHelpers/SubStreamInterface';
-import { prepareStream } from './lib/s3middleware/prepareStream';
-import * as processMpuParts from './lib/s3middleware/processMpuParts';
-import * as retention from './lib/s3middleware/objectRetention';
-import * as objectRestore from './lib/s3middleware/objectRestore';
-import * as lifecycleHelpers from './lib/s3middleware/lifecycleHelpers';
 export { default as errors } from './lib/errors';
-export { default as Clustering } from './lib/Clustering';
-export * as ClusterRPC from './lib/clustering/ClusterRPC';
-export * as ipCheck from './lib/ipCheck';
-export * as auth from './lib/auth/auth';
-export * as constants from './lib/constants';
-export * as https from './lib/https';
-export * as metrics from './lib/metrics';
-export * as network from './lib/network';
-export * as s3routes from './lib/s3routes';
-export * as versioning from './lib/versioning';
-export * as stream from './lib/stream';
-export * as jsutil from './lib/jsutil';
-export { default as stringHash } from './lib/stringHash';
-export * as db from './lib/db';
-export * as errorUtils from './lib/errorUtils';
-export { default as shuffle } from './lib/shuffle';
-export * as models from './lib/models';
+
+export const auth = require('./lib/auth/auth');
+export const constants = require('./lib/constants');
+export const db = require('./lib/db');
+export const shuffle = require('./lib/shuffle');
+export const stringHash = require('./lib/stringHash');
+export const ipCheck = require('./lib/ipCheck');
+export const jsutil = require('./lib/jsutil');
+export const Clustering = require('./lib/Clustering');
+
+export const https = {
+    ciphers: require('./lib/https/ciphers.js'),
+    dhparam: require('./lib/https/dh2048.js'),
+};

 export const algorithms = {
-    list: require('./lib/algos/list/exportAlgos'),
+    list: {
+        Basic: require('./lib/algos/list/basic').List,
+        Delimiter: require('./lib/algos/list/delimiter').Delimiter,
+        DelimiterVersions: require('./lib/algos/list/delimiterVersions').DelimiterVersions,
+        DelimiterMaster: require('./lib/algos/list/delimiterMaster').DelimiterMaster,
+        MPU: require('./lib/algos/list/MPU').MultipartUploads,
+    },
    listTools: {
        DelimiterTools: require('./lib/algos/list/tools'),
-        Skip: require('./lib/algos/list/skip'),
    },
    cache: {
-        GapSet: require('./lib/algos/cache/GapSet'),
-        GapCache: require('./lib/algos/cache/GapCache'),
        LRUCache: require('./lib/algos/cache/LRUCache'),
    },
    stream: {
        MergeStream: require('./lib/algos/stream/MergeStream'),
    },
    SortedSet: require('./lib/algos/set/SortedSet'),
-    Heap: require('./lib/algos/heap/Heap'),
 };

 export const policies = {
-    evaluators,
-    validateUserPolicy,
-    evaluatePrincipal,
-    RequestContext,
-    requestUtils,
-    actionMaps,
-    actionNeedQuotaCheck,
-    actionWithDataDeletion,
-    actionNeedQuotaCheckCopy,
+    evaluators: require('./lib/policyEvaluator/evaluator.js'),
+    validateUserPolicy: require('./lib/policy/policyValidator').validateUserPolicy,
+    evaluatePrincipal: require('./lib/policyEvaluator/principal'),
+    RequestContext: require('./lib/policyEvaluator/RequestContext.js'),
+    requestUtils: require('./lib/policyEvaluator/requestUtils'),
+    actionMaps: require('./lib/policyEvaluator/utils/actionMaps'),
 };

 export const testing = {
    matrix: require('./lib/testing/matrix.js'),
 };

-export const s3middleware = {
-    userMetadata,
-    convertToXml,
-    escapeForXml,
-    objectLegalHold,
-    tagging,
-    checkDateModifiedHeaders,
-    validateConditionalHeaders,
-    MD5Sum,
-    NullStream,
-    objectUtils,
-    azureHelper: {
-        mpuUtils,
-        ResultsCollector,
-        SubStreamInterface,
+export const versioning = {
+    VersioningConstants: require('./lib/versioning/constants.js').VersioningConstants,
+    Version: require('./lib/versioning/Version.js').Version,
+    VersionID: require('./lib/versioning/VersionID.js'),
+    WriteGatheringManager: require('./lib/versioning/WriteGatheringManager.js'),
+    WriteCache: require('./lib/versioning/WriteCache.js'),
+    VersioningRequestProcessor: require('./lib/versioning/VersioningRequestProcessor.js'),
+};
+
+export const network = {
+    http: {
+        server: require('./lib/network/http/server'),
+        utils: require('./lib/network/http/utils'),
    },
-    prepareStream,
-    processMpuParts,
-    retention,
-    objectRestore,
-    lifecycleHelpers,
+    rpc: require('./lib/network/rpc/rpc'),
+    level: require('./lib/network/rpc/level-net'),
+    rest: {
+        RESTServer: require('./lib/network/rest/RESTServer'),
+        RESTClient: require('./lib/network/rest/RESTClient'),
+    },
+    probe: {
+        ProbeServer: require('./lib/network/probe/ProbeServer'),
+    },
+    RoundRobin: require('./lib/network/RoundRobin'),
+    kmip: require('./lib/network/kmip'),
+    kmipClient: require('./lib/network/kmip/Client'),
+};
+
+export const s3routes = {
+    routes: require('./lib/s3routes/routes'),
+    routesUtils: require('./lib/s3routes/routesUtils'),
+};
+
+export const s3middleware = {
+    userMetadata: require('./lib/s3middleware/userMetadata'),
+    convertToXml: require('./lib/s3middleware/convertToXml'),
+    escapeForXml: require('./lib/s3middleware/escapeForXml'),
+    objectLegalHold: require('./lib/s3middleware/objectLegalHold'),
+    tagging: require('./lib/s3middleware/tagging'),
+    validateConditionalHeaders:
+        require('./lib/s3middleware/validateConditionalHeaders').validateConditionalHeaders,
+    MD5Sum: require('./lib/s3middleware/MD5Sum'),
+    NullStream: require('./lib/s3middleware/nullStream'),
+    objectUtils: require('./lib/s3middleware/objectUtils'),
+    azureHelper: {
+        mpuUtils: require('./lib/s3middleware/azureHelpers/mpuUtils'),
+        ResultsCollector: require('./lib/s3middleware/azureHelpers/ResultsCollector'),
+        SubStreamInterface: require('./lib/s3middleware/azureHelpers/SubStreamInterface'),
+    },
+    processMpuParts: require('./lib/s3middleware/processMpuParts'),
+    retention: require('./lib/s3middleware/objectRetention'),
+    lifecycleHelpers: require('./lib/s3middleware/lifecycleHelpers'),
 };

 export const storage = {
@ -166,10 +165,31 @@ export const storage = {
    utils: require('./lib/storage/utils'),
 };

+export const models = {
+    BucketInfo: require('./lib/models/BucketInfo'),
+    ObjectMD: require('./lib/models/ObjectMD'),
+    ObjectMDLocation: require('./lib/models/ObjectMDLocation'),
+    ARN: require('./lib/models/ARN'),
+    WebsiteConfiguration: require('./lib/models/WebsiteConfiguration'),
+    ReplicationConfiguration: require('./lib/models/ReplicationConfiguration'),
+    LifecycleConfiguration: require('./lib/models/LifecycleConfiguration'),
+    LifecycleRule: require('./lib/models/LifecycleRule'),
+    BucketPolicy: require('./lib/models/BucketPolicy'),
+    ObjectLockConfiguration: require('./lib/models/ObjectLockConfiguration'),
+    NotificationConfiguration: require('./lib/models/NotificationConfiguration'),
+};
+
+export const metrics = {
+    StatsClient: require('./lib/metrics/StatsClient'),
+    StatsModel: require('./lib/metrics/StatsModel'),
+    RedisClient: require('./lib/metrics/RedisClient'),
+    ZenkoMetrics: require('./lib/metrics/ZenkoMetrics'),
+};
+
 export const pensieve = {
    credentialUtils: require('./lib/executables/pensieveCreds/utils'),
 };

-export const patches = {
-    locationConstraints,
+export const stream = {
+    readJSONStreamObject: require('./lib/stream/readJSONStreamObject'),
 };
--- a/lib/Clustering.js
+++ b/lib/Clustering.js
@ -1,28 +1,18 @@
-import cluster, { Worker } from 'cluster';
-import * as werelogs from 'werelogs';
+'use strict'; // eslint-disable-line

-export default class Clustering {
-    _size: number;
-    _shutdownTimeout: number;
-    _logger: werelogs.Logger;
-    _shutdown: boolean;
-    _workers: (Worker | undefined)[];
-    _workersTimeout: (NodeJS.Timeout | undefined)[];
-    _workersStatus: (number | string | undefined)[];
-    _status: number;
-    _exitCb?: (clustering: Clustering, exitSignal?: string) => void;
-    _index?: number;
+const cluster = require('cluster');

+class Clustering {
    /**
     * Constructor
     *
-     * @param size Cluster size
-     * @param logger Logger object
-     * @param [shutdownTimeout=5000] Change default shutdown timeout
+     * @param {number} size Cluster size
+     * @param {Logger} logger Logger object
+     * @param {number} [shutdownTimeout=5000] Change default shutdown timeout
     * releasing ressources
-     * @return itself
+     * @return {Clustering} itself
     */
-    constructor(size: number, logger: werelogs.Logger, shutdownTimeout?: number) {
+    constructor(size, logger, shutdownTimeout) {
        this._size = size;
        if (size < 1) {
            throw new Error('Cluster size must be greater than or equal to 1');
@ -42,6 +32,7 @@ export default class Clustering {
     * Method called after a stop() call
     *
     * @private
+     * @return {undefined}
     */
    _afterStop() {
        // Asuming all workers shutdown gracefully
@ -50,11 +41,10 @@ export default class Clustering {
        for (let i = 0; i < size; ++i) {
            // If the process return an error code or killed by a signal,
            // set the status
-            const status = this._workersStatus[i];
-            if (typeof status === 'number') {
-                this._status = status;
+            if (typeof this._workersStatus[i] === 'number') {
+                this._status = this._workersStatus[i];
                break;
-            } else if (typeof status === 'string') {
+            } else if (typeof this._workersStatus[i] === 'string') {
                this._status = 1;
                break;
            }
@ -68,17 +58,13 @@ export default class Clustering {
    /**
     * Method called when a worker exited
     *
-     * @param worker - Current worker
-     * @param i - Worker index
-     * @param code - Exit code
-     * @param signal - Exit signal
+     * @param {Cluster.worker} worker - Current worker
+     * @param {number} i - Worker index
+     * @param {number} code - Exit code
+     * @param {string} signal - Exit signal
+     * @return {undefined}
     */
-    _workerExited(
-        worker: Worker,
-        i: number,
-        code: number,
-        signal: string,
-    ) {
+    _workerExited(worker, i, code, signal) {
        // If the worker:
        //   - was killed by a signal
        //   - return an error code
@ -105,9 +91,8 @@ export default class Clustering {
            this._workersStatus[i] = undefined;
        }
        this._workers[i] = undefined;
-        const timeout = this._workersTimeout[i];
-        if (timeout) {
-            clearTimeout(timeout);
+        if (this._workersTimeout[i]) {
+            clearTimeout(this._workersTimeout[i]);
            this._workersTimeout[i] = undefined;
        }
        // If we don't trigger the stop method, the watchdog
@ -125,28 +110,29 @@ export default class Clustering {
    /**
     * Method to start a worker
     *
-     * @param i Index of the starting worker
+     * @param {number} i Index of the starting worker
+     * @return {undefined}
     */
-    startWorker(i: number) {
-        if (!cluster.isPrimary) {
+    startWorker(i) {
+        if (!cluster.isMaster) {
            return;
        }
        // Fork a new worker
        this._workers[i] = cluster.fork();
        // Listen for message from the worker
-        this._workers[i]!.on('message', msg => {
+        this._workers[i].on('message', msg => {
            // If the worker is ready, send him his id
            if (msg === 'ready') {
-                this._workers[i]!.send({ msg: 'setup', id: i });
+                this._workers[i].send({ msg: 'setup', id: i });
            }
        });
-        this._workers[i]!.on('exit', (code, signal) =>
-            this._workerExited(this._workers[i]!, i, code, signal));
+        this._workers[i].on('exit', (code, signal) =>
+            this._workerExited(this._workers[i], i, code, signal));
        // Trigger when the worker was started
-        this._workers[i]!.on('online', () => {
+        this._workers[i].on('online', () => {
            this._logger.info('Worker started', {
                id: i,
-                childPid: this._workers[i]!.process.pid,
+                childPid: this._workers[i].process.pid,
            });
        });
    }
@ -154,10 +140,10 @@ export default class Clustering {
    /**
     * Method to put handler on cluster exit
     *
-     * @param cb - Callback(Clustering, [exitSignal])
-     * @return Itself
+     * @param {function} cb - Callback(Clustering, [exitSignal])
+     * @return {Clustering} Itself
     */
-    onExit(cb: (clustering: Clustering, exitSignal?: string) => void) {
+    onExit(cb) {
        this._exitCb = cb;
        return this;
    }
@ -166,33 +152,33 @@ export default class Clustering {
     * Method to start the cluster (if master) or to start the callback
     * (worker)
     *
-     * @param cb - Callback to run the worker
-     * @return itself
+     * @param {function} cb - Callback to run the worker
+     * @return {Clustering} itself
     */
-    start(cb: (clustering: Clustering) => void) {
+    start(cb) {
        process.on('SIGINT', () => this.stop('SIGINT'));
        process.on('SIGHUP', () => this.stop('SIGHUP'));
        process.on('SIGQUIT', () => this.stop('SIGQUIT'));
        process.on('SIGTERM', () => this.stop('SIGTERM'));
        process.on('SIGPIPE', () => {});
-        process.on('exit', (code?: number, signal?: string) => {
+        process.on('exit', (code, signal) => {
            if (this._exitCb) {
                this._status = code || 0;
                return this._exitCb(this, signal);
            }
            return process.exit(code || 0);
        });
-        process.on('uncaughtException', (err: Error) => {
+        process.on('uncaughtException', err => {
            this._logger.fatal('caught error', {
                error: err.message,
-                stack: err.stack?.split('\n')?.map(str => str.trim()),
+                stack: err.stack.split('\n').map(str => str.trim()),
            });
            process.exit(1);
        });
-        if (!cluster.isPrimary) {
+        if (!cluster.isMaster) {
            // Waiting for message from master to
            // know the id of the slave cluster
-            process.on('message', (msg: any) => {
+            process.on('message', msg => {
                if (msg.msg === 'setup') {
                    this._index = msg.id;
                    cb(this);
@ -200,7 +186,7 @@ export default class Clustering {
            });
            // Send message to the master, to let him know
            // the worker has started
-            process.send?.('ready');
+            process.send('ready');
        } else {
            for (let i = 0; i < this._size; ++i) {
                this.startWorker(i);
@ -212,7 +198,7 @@ export default class Clustering {
    /**
     * Method to get workers
     *
-     * @return Workers
+     * @return {Cluster.Worker[]} Workers
     */
    getWorkers() {
        return this._workers;
@ -221,7 +207,7 @@ export default class Clustering {
    /**
     * Method to get the status of the cluster
     *
-     * @return Status code
+     * @return {number} Status code
     */
    getStatus() {
        return this._status;
@ -230,7 +216,7 @@ export default class Clustering {
    /**
     * Method to return if it's the master process
     *
-     * @return - True if master, false otherwise
+     * @return {boolean} - True if master, false otherwise
     */
    isMaster() {
        return this._index === undefined;
@ -239,7 +225,7 @@ export default class Clustering {
    /**
     * Method to get index of the worker
     *
-     * @return Worker index, undefined if it's master
+     * @return {number|undefined} Worker index, undefined if it's master
     */
    getIndex() {
        return this._index;
@ -248,10 +234,11 @@ export default class Clustering {
    /**
     * Method to stop the cluster
     *
-     * @param signal - Set internally when processes killed by signal
+     * @param {string} signal - Set internally when processes killed by signal
+     * @return {undefined}
     */
-    stop(signal?: string) {
-        if (!cluster.isPrimary) {
+    stop(signal) {
+        if (!cluster.isMaster) {
            if (this._exitCb) {
                return this._exitCb(this, signal);
            }
@ -264,17 +251,13 @@ export default class Clustering {
            }
            this._workersTimeout[i] = setTimeout(() => {
                // Kill the worker if the sigterm was ignored or take too long
-                if (worker.process.pid) {
                process.kill(worker.process.pid, 'SIGKILL');
-                }
            }, this._shutdownTimeout);
            // Send sigterm to the process, allowing to release ressources
            // and save some states
-            if (worker.process.pid) {
            return process.kill(worker.process.pid, 'SIGTERM');
-            } else {
-              return true;
-            }
        });
    }
 }
+
+module.exports = Clustering;
--- a/lib/algos/cache/GapCache.ts
+++ b/lib/algos/cache/GapCache.ts
@ -1,363 +0,0 @@
-import { OrderedSet } from '@js-sdsl/ordered-set';
-import {
-    default as GapSet,
-    GapSetEntry,
-} from './GapSet';
-
-// the API is similar but is not strictly a superset of GapSetInterface
-// so we don't extend from it
-export interface GapCacheInterface {
-    exposureDelayMs: number;
-    maxGapWeight: number;
-    size: number;
-
-    setGap: (firstKey: string, lastKey: string, weight: number) => void;
-    removeOverlappingGaps: (overlappingKeys: string[]) => number;
-    lookupGap: (minKey: string, maxKey?: string) => Promise<GapSetEntry | null>;
-    [Symbol.iterator]: () => Iterator<GapSetEntry>;
-    toArray: () => GapSetEntry[];
-};
-
-class GapCacheUpdateSet {
-    newGaps: GapSet;
-    updatedKeys: OrderedSet<string>;
-
-    constructor(maxGapWeight: number) {
-        this.newGaps = new GapSet(maxGapWeight);
-        this.updatedKeys = new OrderedSet();
-    }
-
-    addUpdateBatch(updatedKeys: OrderedSet<string>): void {
-        this.updatedKeys.union(updatedKeys);
-    }
-};
-
-/**
- * Cache of listing "gaps" i.e. ranges of keys that can be skipped
- * over during listing (because they only contain delete markers as
- * latest versions).
- *
- * Typically, a single GapCache instance would be attached to a raft session.
- *
- * The API usage is as follows:
- *
- * - Initialize a GapCache instance by calling start() (this starts an internal timer)
- *
- * - Insert a gap or update an existing one via setGap()
- *
- * - Lookup existing gaps via lookupGap()
- *
- * - Invalidate gaps that overlap a specific set of keys via removeOverlappingGaps()
- *
- * - Shut down a GapCache instance by calling stop() (this stops the internal timer)
- *
- * Gaps inserted via setGap() are not exposed immediately to lookupGap(), but only:
- *
- * - after a certain delay always larger than 'exposureDelayMs' and usually shorter
- *   than twice this value (but might be slightly longer in rare cases)
- *
- * - and only if they haven't been invalidated by a recent call to removeOverlappingGaps()
- *
- * This ensures atomicity between gap creation and invalidation from updates under
- * the condition that a gap is created from first key to last key within the time defined
- * by 'exposureDelayMs'.
- *
- * The implementation is based on two extra temporary "update sets" on top of the main
- * exposed gap set, one called "staging" and the other "frozen", each containing a
- * temporary updated gap set and a list of updated keys to invalidate gaps with (coming
- * from calls to removeOverlappingGaps()). Every "exposureDelayMs" milliseconds, the frozen
- * gaps are invalidated by all key updates coming from either of the "staging" or "frozen"
- * update set, then merged into the exposed gaps set, after which the staging updates become
- * the frozen updates and won't receive any new gap until the next cycle.
- */
-export default class GapCache implements GapCacheInterface {
-    _exposureDelayMs: number;
-    maxGaps: number;
-
-    _stagingUpdates: GapCacheUpdateSet;
-    _frozenUpdates: GapCacheUpdateSet;
-    _exposedGaps: GapSet;
-    _exposeFrozenInterval: NodeJS.Timeout | null;
-
-    /**
-     * @constructor
-     *
-     * @param {number} exposureDelayMs - minimum delay between
-     * insertion of a gap via setGap() and its exposure via
-     * lookupGap()
-     * @param {number} maxGaps - maximum number of cached gaps, after
-     * which no new gap can be added by setGap(). (Note: a future
-     * improvement could replace this by an eviction strategy)
-     * @param {number} maxGapWeight - maximum "weight" of individual
-     * cached gaps, which is also the granularity for
-     * invalidation. Individual gaps can be chained together,
-     * which lookupGap() transparently consolidates in the response
-     * into a single large gap.
-     */
-    constructor(exposureDelayMs: number, maxGaps: number, maxGapWeight: number) {
-        this._exposureDelayMs = exposureDelayMs;
-        this.maxGaps = maxGaps;
-
-        this._stagingUpdates = new GapCacheUpdateSet(maxGapWeight);
-        this._frozenUpdates = new GapCacheUpdateSet(maxGapWeight);
-        this._exposedGaps = new GapSet(maxGapWeight);
-        this._exposeFrozenInterval = null;
-    }
-
-    /**
-     * Create a GapCache from an array of exposed gap entries (used in tests)
-     *
-     * @return {GapCache} - a new GapCache instance
-     */
-    static createFromArray(
-        gaps: GapSetEntry[],
-        exposureDelayMs: number,
-        maxGaps: number,
-        maxGapWeight: number
-    ): GapCache {
-        const gapCache = new GapCache(exposureDelayMs, maxGaps, maxGapWeight);
-        gapCache._exposedGaps = GapSet.createFromArray(gaps, maxGapWeight)
-        return gapCache;
-    }
-
-    /**
-     * Internal helper to remove gaps in the staging and frozen sets
-     * overlapping with previously updated keys, right before the
-     * frozen gaps get exposed.
-     *
-     * @return {undefined}
-     */
-    _removeOverlappingGapsBeforeExpose(): void {
-        for (const { updatedKeys } of [this._stagingUpdates, this._frozenUpdates]) {
-            if (updatedKeys.size() === 0) {
-                continue;
-            }
-            for (const { newGaps } of [this._stagingUpdates, this._frozenUpdates]) {
-                if (newGaps.size === 0) {
-                    continue;
-                }
-                newGaps.removeOverlappingGaps(updatedKeys);
-            }
-        }
-    }
-
-    /**
-     * This function is the core mechanism that updates the exposed gaps in the
-     * cache. It is called on a regular interval defined by 'exposureDelayMs'.
-     *
-     * It does the following in order:
-     *
-     * - remove gaps from the frozen set that overlap with any key present in a
-     *   batch passed to removeOverlappingGaps() since the last two triggers of
-     *   _exposeFrozen()
-     *
-     * - merge the remaining gaps from the frozen set to the exposed set, which
-     *   makes them visible from calls to lookupGap()
-     *
-     * - rotate by freezing the currently staging updates and initiating a new
-     *   staging updates set
-     *
-     * @return {undefined}
-     */
-    _exposeFrozen(): void {
-        this._removeOverlappingGapsBeforeExpose();
-        for (const gap of this._frozenUpdates.newGaps) {
-            // Use a trivial strategy to keep the cache size within
-            // limits: refuse to add new gaps when the size is above
-            // the 'maxGaps' threshold. We solely rely on
-            // removeOverlappingGaps() to make space for new gaps.
-            if (this._exposedGaps.size < this.maxGaps) {
-                this._exposedGaps.setGap(gap.firstKey, gap.lastKey, gap.weight);
-            }
-        }
-        this._frozenUpdates = this._stagingUpdates;
-        this._stagingUpdates = new GapCacheUpdateSet(this.maxGapWeight);
-    }
-
-    /**
-     * Start the internal GapCache timer
-     *
-     * @return {undefined}
-     */
-    start(): void {
-        if (this._exposeFrozenInterval) {
-            return;
-        }
-        this._exposeFrozenInterval = setInterval(
-            () => this._exposeFrozen(),
-            this._exposureDelayMs);
-    }
-
-    /**
-     * Stop the internal GapCache timer
-     *
-     * @return {undefined}
-     */
-    stop(): void {
-        if (this._exposeFrozenInterval) {
-            clearInterval(this._exposeFrozenInterval);
-            this._exposeFrozenInterval = null;
-        }
-    }
-
-    /**
-     * Record a gap between two keys, associated with a weight to
-     * limit individual gap's spanning ranges in the cache, for a more
-     * granular invalidation.
-     *
-     * The function handles splitting and merging existing gaps to
-     * maintain an optimal weight of cache entries.
-     *
-     * NOTE 1: the caller must ensure that the full length of the gap
-     * between 'firstKey' and 'lastKey' has been built from a listing
-     * snapshot that is more recent than 'exposureDelayMs' milliseconds,
-     * in order to guarantee that the exposed gap will be fully
-     * covered (and potentially invalidated) from recent calls to
-     * removeOverlappingGaps().
-     *
-     * NOTE 2: a usual pattern when building a large gap from multiple
-     * calls to setGap() is to start the next gap from 'lastKey',
-     * which will be passed as 'firstKey' in the next call, so that
-     * gaps can be chained together and consolidated by lookupGap().
-     *
-     * @param {string} firstKey - first key of the gap
-     * @param {string} lastKey - last key of the gap, must be greater
-     * or equal than 'firstKey'
-     * @param {number} weight - total weight between 'firstKey' and 'lastKey'
-     * @return {undefined}
-     */
-    setGap(firstKey: string, lastKey: string, weight: number): void {
-        this._stagingUpdates.newGaps.setGap(firstKey, lastKey, weight);
-    }
-
-    /**
-     * Remove gaps that overlap with a given set of keys. Used to
-     * invalidate gaps when keys are inserted or deleted.
-     *
-     * @param {OrderedSet<string> | string[]} overlappingKeys - remove gaps that
-     * overlap with any of this set of keys
-     * @return {number} - how many gaps were removed from the exposed
-     * gaps only (overlapping gaps not yet exposed are also invalidated
-     * but are not accounted for in the returned value)
-     */
-    removeOverlappingGaps(overlappingKeys: OrderedSet<string> | string[]): number {
-        let overlappingKeysSet;
-        if (Array.isArray(overlappingKeys)) {
-            overlappingKeysSet = new OrderedSet(overlappingKeys);
-        } else {
-            overlappingKeysSet = overlappingKeys;
-        }
-        this._stagingUpdates.addUpdateBatch(overlappingKeysSet);
-        return this._exposedGaps.removeOverlappingGaps(overlappingKeysSet);
-    }
-
-    /**
-     * Lookup the next exposed gap that overlaps with [minKey, maxKey]. Internally
-     * chained gaps are coalesced in the response into a single contiguous large gap.
-     *
-     * @param {string} minKey - minimum key overlapping with the returned gap
-     * @param {string} [maxKey] - maximum key overlapping with the returned gap
-     * @return {Promise<GapSetEntry | null>} - result of the lookup if a gap
-     *   was found, null otherwise, as a Promise
-     */
-    lookupGap(minKey: string, maxKey?: string): Promise<GapSetEntry | null> {
-        return this._exposedGaps.lookupGap(minKey, maxKey);
-    }
-
-    /**
-     * Get the maximum weight setting for individual gaps.
-     *
-     * @return {number} - maximum weight of individual gaps
-     */
-    get maxGapWeight(): number {
-        return this._exposedGaps.maxWeight;
-    }
-
-    /**
-     * Set the maximum weight setting for individual gaps.
-     *
-     * @param {number} gapWeight - maximum weight of individual gaps
-     */
-    set maxGapWeight(gapWeight: number) {
-        this._exposedGaps.maxWeight = gapWeight;
-        // also update transient gap sets
-        this._stagingUpdates.newGaps.maxWeight = gapWeight;
-        this._frozenUpdates.newGaps.maxWeight = gapWeight;
-    }
-
-    /**
-     * Get the exposure delay in milliseconds, which is the minimum
-     * time after which newly cached gaps will be exposed by
-     * lookupGap().
-     *
-     * @return {number} - exposure delay in milliseconds
-     */
-    get exposureDelayMs(): number {
-        return this._exposureDelayMs;
-    }
-
-    /**
-     * Set the exposure delay in milliseconds, which is the minimum
-     * time after which newly cached gaps will be exposed by
-     * lookupGap(). Setting this attribute automatically updates the
-     * internal state to honor the new value.
-     *
-     * @param {number} - exposure delay in milliseconds
-     */
-    set exposureDelayMs(exposureDelayMs: number) {
-        if (exposureDelayMs !== this._exposureDelayMs) {
-            this._exposureDelayMs = exposureDelayMs;
-            if (this._exposeFrozenInterval) {
-                // invalidate all pending gap updates, as the new interval may not be
-                // safe for them
-                this._stagingUpdates = new GapCacheUpdateSet(this.maxGapWeight);
-                this._frozenUpdates = new GapCacheUpdateSet(this.maxGapWeight);
-
-                // reinitialize the _exposeFrozenInterval timer with the updated delay
-                this.stop();
-                this.start();
-            }
-        }
-    }
-
-    /**
-     * Get the number of exposed gaps
-     *
-     * @return {number} number of exposed gaps
-     */
-    get size(): number {
-        return this._exposedGaps.size;
-    }
-
-    /**
-     * Iterate over exposed gaps
-     *
-     * @return {Iterator<GapSetEntry>} an iterator over exposed gaps
-     */
-    [Symbol.iterator](): Iterator<GapSetEntry> {
-        return this._exposedGaps[Symbol.iterator]();
-    }
-
-    /**
-     * Get an array of all exposed gaps
-     *
-     * @return {GapSetEntry[]} array of exposed gaps
-     */
-    toArray(): GapSetEntry[] {
-        return this._exposedGaps.toArray();
-    }
-
-    /**
-     * Clear all exposed and staging gaps from the cache.
-     *
-     * Note: retains invalidating updates from removeOverlappingGaps()
-     * for correctness of gaps inserted afterwards.
-     *
-     * @return {undefined}
-     */
-    clear(): void {
-        this._stagingUpdates.newGaps = new GapSet(this.maxGapWeight);
-        this._frozenUpdates.newGaps = new GapSet(this.maxGapWeight);
-        this._exposedGaps = new GapSet(this.maxGapWeight);
-    }
-}
--- a/lib/algos/cache/GapSet.ts
+++ b/lib/algos/cache/GapSet.ts
@ -1,366 +0,0 @@
-import assert from 'assert';
-import { OrderedSet } from '@js-sdsl/ordered-set';
-
-import errors from '../../errors';
-
-export type GapSetEntry = {
-    firstKey: string,
-    lastKey: string,
-    weight: number,
-};
-
-export interface GapSetInterface {
-    maxWeight: number;
-    size: number;
-
-    setGap: (firstKey: string, lastKey: string, weight: number) => GapSetEntry;
-    removeOverlappingGaps: (overlappingKeys: string[]) => number;
-    lookupGap: (minKey: string, maxKey?: string) => Promise<GapSetEntry | null>;
-    [Symbol.iterator]: () => Iterator<GapSetEntry>;
-    toArray: () => GapSetEntry[];
-};
-
-/**
- * Specialized data structure to support caching of listing "gaps",
- * i.e. ranges of keys that can be skipped over during listing
- * (because they only contain delete markers as latest versions)
- */
-export default class GapSet implements GapSetInterface, Iterable<GapSetEntry> {
-    _gaps: OrderedSet<GapSetEntry>;
-    _maxWeight: number;
-
-    /**
-     * @constructor
-
-     * @param {number} maxWeight - weight threshold for each cached
-     * gap (unitless). Triggers splitting gaps when reached
-     */
-    constructor(maxWeight: number) {
-        this._gaps = new OrderedSet(
-            [],
-            (left: GapSetEntry, right: GapSetEntry) => (
-                left.firstKey < right.firstKey ? -1 :
-                left.firstKey > right.firstKey ? 1 : 0
-            )
-        );
-        this._maxWeight = maxWeight;
-    }
-
-    /**
-     * Create a GapSet from an array of gap entries (used in tests)
-     */
-    static createFromArray(gaps: GapSetEntry[], maxWeight: number): GapSet {
-        const gapSet = new GapSet(maxWeight);
-        for (const gap of gaps) {
-            gapSet._gaps.insert(gap);
-        }
-        return gapSet;
-    }
-
-    /**
-     * Record a gap between two keys, associated with a weight to limit
-     * individual gap sizes in the cache.
-     *
-     * The function handles splitting and merging existing gaps to
-     * maintain an optimal weight of cache entries.
-     *
-     * @param {string} firstKey - first key of the gap
-     * @param {string} lastKey - last key of the gap, must be greater
-     * or equal than 'firstKey'
-     * @param {number} weight - total weight between 'firstKey' and 'lastKey'
-     * @return {GapSetEntry} - existing or new gap entry
-     */
-    setGap(firstKey: string, lastKey: string, weight: number): GapSetEntry {
-        assert(lastKey >= firstKey);
-
-        // Step 1/4: Find the closest left-overlapping gap, and either re-use it
-        // or chain it with a new gap depending on the weights if it exists (otherwise
-        // just creates a new gap).
-        const curGapIt = this._gaps.reverseLowerBound(<GapSetEntry>{ firstKey });
-        let curGap;
-        if (curGapIt.isAccessible()) {
-            curGap = curGapIt.pointer;
-            if (curGap.lastKey >= lastKey) {
-                // return fully overlapping gap already cached
-                return curGap;
-            }
-        }
-        let remainingWeight = weight;
-        if (!curGap                         // no previous gap
-            || curGap.lastKey < firstKey    // previous gap not overlapping
-            || (curGap.lastKey === firstKey // previous gap overlapping by one key...
-                && curGap.weight + weight > this._maxWeight) // ...but we can't extend it
-           ) {
-            // create a new gap indexed by 'firstKey'
-            curGap = { firstKey, lastKey: firstKey, weight: 0 };
-            this._gaps.insert(curGap);
-        } else if (curGap.lastKey > firstKey && weight > this._maxWeight) {
-            // previous gap is either fully or partially contained in the new gap
-            // and cannot be extended: substract its weight from the total (heuristic
-            // in case the previous gap doesn't start at 'firstKey', which is the
-            // uncommon case)
-            remainingWeight -= curGap.weight;
-
-            // there may be an existing chained gap starting with the previous gap's
-            // 'lastKey': use it if it exists
-            const chainedGapIt = this._gaps.find(<GapSetEntry>{ firstKey: curGap.lastKey });
-            if (chainedGapIt.isAccessible()) {
-                curGap = chainedGapIt.pointer;
-            } else {
-                // no existing chained gap: chain a new gap to the previous gap
-                curGap = {
-                    firstKey: curGap.lastKey,
-                    lastKey: curGap.lastKey,
-                    weight: 0,
-                };
-                this._gaps.insert(curGap);
-            }
-        }
-        // Step 2/4: Cleanup existing gaps fully included in firstKey -> lastKey, and
-        // aggregate their weights in curGap to define the minimum weight up to the
-        // last merged gap.
-        let nextGap;
-        while (true) {
-            const nextGapIt = this._gaps.upperBound(<GapSetEntry>{ firstKey: curGap.firstKey });
-            nextGap = nextGapIt.isAccessible() && nextGapIt.pointer;
-            // stop the cleanup when no more gap or if the next gap is not fully
-            // included in curGap
-            if (!nextGap || nextGap.lastKey > lastKey) {
-                break;
-            }
-            this._gaps.eraseElementByIterator(nextGapIt);
-            curGap.lastKey = nextGap.lastKey;
-            curGap.weight += nextGap.weight;
-        }
-
-        // Step 3/4: Extend curGap to lastKey, adjusting the weight.
-        // At this point, curGap weight is the minimum weight of the finished gap, save it
-        // for step 4.
-        let minMergedWeight = curGap.weight;
-        if (curGap.lastKey === firstKey && firstKey !== lastKey) {
-            // extend the existing gap by the full amount 'firstKey -> lastKey'
-            curGap.lastKey = lastKey;
-            curGap.weight += remainingWeight;
-        } else if (curGap.lastKey <= lastKey) {
-            curGap.lastKey = lastKey;
-            curGap.weight = remainingWeight;
-        }
-
-        // Step 4/4: Find the closest right-overlapping gap, and if it exists, either merge
-        // it or chain it with curGap depending on the weights.
-        if (nextGap && nextGap.firstKey <= lastKey) {
-            // nextGap overlaps with the new gap: check if we can merge it
-            minMergedWeight += nextGap.weight;
-            let mergedWeight;
-            if (lastKey === nextGap.firstKey) {
-                // nextGap is chained with curGap: add the full weight of nextGap
-                mergedWeight = curGap.weight + nextGap.weight;
-            } else {
-                // strict overlap: don't add nextGap's weight unless
-                // it's larger than the sum of merged ranges (as it is
-                // then included in `minMergedWeight`)
-                mergedWeight = Math.max(curGap.weight, minMergedWeight);
-            }
-            if (mergedWeight <= this._maxWeight) {
-                // merge nextGap into curGap
-                curGap.lastKey = nextGap.lastKey;
-                curGap.weight = mergedWeight;
-                this._gaps.eraseElementByKey(nextGap);
-            } else {
-                // adjust the last key to chain with nextGap and substract the next
-                // gap's weight from curGap (heuristic)
-                curGap.lastKey = nextGap.firstKey;
-                curGap.weight = Math.max(mergedWeight - nextGap.weight, 0);
-                curGap = nextGap;
-            }
-        }
-        // return a copy of curGap
-        return Object.assign({}, curGap);
-    }
-
-    /**
-     * Remove gaps that overlap with one or more keys in a given array or
-     * OrderedSet. Used to invalidate gaps when keys are inserted or deleted.
-     *
-     * @param {OrderedSet<string> | string[]} overlappingKeys - remove gaps that overlap
-     * with any of this set of keys
-     * @return {number} - how many gaps were removed
-     */
-    removeOverlappingGaps(overlappingKeys: OrderedSet<string> | string[]): number {
-        // To optimize processing with a large number of keys and/or gaps, this function:
-        //
-        // 1. converts the overlappingKeys array to a OrderedSet (if not already a OrderedSet)
-        // 2. queries both the gaps set and the overlapping keys set in a loop, which allows:
-        //    - skipping ranges of overlapping keys at once when there is no new overlapping gap
-        //    - skipping ranges of gaps at once when there is no overlapping key
-        //
-        // This way, it is efficient when the number of non-overlapping gaps is large
-        // (which is the most common case in practice).
-
-        let overlappingKeysSet;
-        if (Array.isArray(overlappingKeys)) {
-            overlappingKeysSet = new OrderedSet(overlappingKeys);
-        } else {
-            overlappingKeysSet = overlappingKeys;
-        }
-        const firstKeyIt = overlappingKeysSet.begin();
-        let currentKey = firstKeyIt.isAccessible() && firstKeyIt.pointer;
-        let nRemoved = 0;
-        while (currentKey) {
-            const closestGapIt = this._gaps.reverseUpperBound(<GapSetEntry>{ firstKey: currentKey });
-            if (closestGapIt.isAccessible()) {
-                const closestGap = closestGapIt.pointer;
-                if (currentKey <= closestGap.lastKey) {
-                    // currentKey overlaps closestGap: remove the gap
-                    this._gaps.eraseElementByIterator(closestGapIt);
-                    nRemoved += 1;
-                }
-            }
-            const nextGapIt = this._gaps.lowerBound(<GapSetEntry>{ firstKey: currentKey });
-            if (!nextGapIt.isAccessible()) {
-                // no more gap: we're done
-                return nRemoved;
-            }
-            const nextGap = nextGapIt.pointer;
-            // advance to the last key potentially overlapping with nextGap
-            let currentKeyIt = overlappingKeysSet.reverseLowerBound(nextGap.lastKey);
-            if (currentKeyIt.isAccessible()) {
-                currentKey = currentKeyIt.pointer;
-                if (currentKey >= nextGap.firstKey) {
-                    // currentKey overlaps nextGap: remove the gap
-                    this._gaps.eraseElementByIterator(nextGapIt);
-                    nRemoved += 1;
-                }
-            }
-            // advance to the first key potentially overlapping with another gap
-            currentKeyIt = overlappingKeysSet.lowerBound(nextGap.lastKey);
-            currentKey = currentKeyIt.isAccessible() && currentKeyIt.pointer;
-        }
-        return nRemoved;
-    }
-
-    /**
-     * Internal helper to coalesce multiple chained gaps into a single gap.
-     *
-     * It is only used to construct lookupGap() return values and
-     * doesn't modify the GapSet.
-     *
-     * NOTE: The function may take a noticeable amount of time and CPU
-     * to execute if a large number of chained gaps have to be
-     * coalesced, but it should never take more than a few seconds. In
-     * most cases it should take less than a millisecond. It regularly
-     * yields to the nodejs event loop to avoid blocking it during a
-     * long execution.
-     *
-     * @param {GapSetEntry} firstGap - first gap of the chain to coalesce with
-     * the next ones in the chain
-     * @return {Promise<GapSetEntry>} - a new coalesced entry, as a Promise
-     */
-    _coalesceGapChain(firstGap: GapSetEntry): Promise<GapSetEntry> {
-        return new Promise(resolve => {
-            const coalescedGap: GapSetEntry = Object.assign({}, firstGap);
-            const coalesceGapChainIteration = () => {
-                // efficiency trade-off: 100 iterations of log(N) complexity lookups should
-                // not block the event loop for too long
-                for (let opCounter = 0; opCounter < 100; ++opCounter) {
-                    const chainedGapIt = this._gaps.find(
-                            <GapSetEntry>{ firstKey: coalescedGap.lastKey });
-                    if (!chainedGapIt.isAccessible()) {
-                        // chain is complete
-                        return resolve(coalescedGap);
-                    }
-                    const chainedGap = chainedGapIt.pointer;
-                    if (chainedGap.firstKey === chainedGap.lastKey) {
-                        // found a single-key gap: chain is complete
-                        return resolve(coalescedGap);
-                    }
-                    coalescedGap.lastKey = chainedGap.lastKey;
-                    coalescedGap.weight += chainedGap.weight;
-                }
-                // yield to the event loop before continuing the process
-                // of coalescing the gap chain
-                return process.nextTick(coalesceGapChainIteration);
-            };
-            coalesceGapChainIteration();
-        });
-    }
-
-    /**
-     * Lookup the next gap that overlaps with [minKey, maxKey]. Internally chained
-     * gaps are coalesced in the response into a single contiguous large gap.
-     *
-     * @param {string} minKey - minimum key overlapping with the returned gap
-     * @param {string} [maxKey] - maximum key overlapping with the returned gap
-     * @return {Promise<GapSetEntry | null>} - result of the lookup if a gap
-     *   was found, null otherwise, as a Promise
-     */
-    async lookupGap(minKey: string, maxKey?: string): Promise<GapSetEntry | null> {
-        let firstGap: GapSetEntry | null = null;
-        const minGapIt = this._gaps.reverseLowerBound(<GapSetEntry>{ firstKey: minKey });
-        const minGap = minGapIt.isAccessible() && minGapIt.pointer;
-        if (minGap && minGap.lastKey >= minKey) {
-            firstGap = minGap;
-        } else {
-            const maxGapIt = this._gaps.upperBound(<GapSetEntry>{ firstKey: minKey });
-            const maxGap = maxGapIt.isAccessible() && maxGapIt.pointer;
-            if (maxGap && (maxKey === undefined || maxGap.firstKey <= maxKey)) {
-                firstGap = maxGap;
-            }
-        }
-        if (!firstGap) {
-            return null;
-        }
-        return this._coalesceGapChain(firstGap);
-    }
-
-    /**
-     * Get the maximum weight setting for individual gaps.
-     *
-     * @return {number} - maximum weight of individual gaps
-     */
-    get maxWeight(): number {
-        return this._maxWeight;
-    }
-
-    /**
-     * Set the maximum weight setting for individual gaps.
-     *
-     * @param {number} gapWeight - maximum weight of individual gaps
-     */
-    set maxWeight(gapWeight: number) {
-        this._maxWeight = gapWeight;
-    }
-
-    /**
-     * Get the number of gaps stored in this set.
-     *
-     * @return {number} - number of gaps stored in this set
-     */
-    get size(): number {
-        return this._gaps.size();
-    }
-
-    /**
-     * Iterate over each gap of the set, ordered by first key
-     *
-     * @return {Iterator<GapSetEntry>} - an iterator over all gaps
-     *   Example:
-     *     for (const gap of myGapSet) { ... }
-     */
-    [Symbol.iterator](): Iterator<GapSetEntry> {
-        return this._gaps[Symbol.iterator]();
-    }
-
-    /**
-     * Return an array containing all gaps, ordered by first key
-     *
-     * NOTE: there is a toArray() method in the OrderedSet implementation
-     * but it does not scale well and overflows the stack quickly. This is
-     * why we provide an implementation based on an iterator.
-     *
-     * @return {GapSetEntry[]} - an array containing all gaps
-     */
-    toArray(): GapSetEntry[] {
-        return [...this];
-    }
-}
--- a/lib/algos/heap/Heap.ts
+++ b/lib/algos/heap/Heap.ts
@ -1,124 +0,0 @@
-export enum HeapOrder {
-    Min = -1,
-    Max = 1,
-}
-
-export enum CompareResult {
-    LT = -1,
-    EQ = 0,
-    GT = 1,
-}
-
-export type CompareFunction = (x: any, y: any) => CompareResult;
-
-export class Heap {
-    size: number;
-    _maxSize: number;
-    _order: HeapOrder;
-    _heap: any[];
-    _cmpFn: CompareFunction;
-    
-    constructor(size: number, order: HeapOrder, cmpFn: CompareFunction) {
-        this.size = 0;
-        this._maxSize = size;
-        this._order = order;
-        this._cmpFn = cmpFn;
-        this._heap = new Array<any>(this._maxSize);
-    }
-
-    _parent(i: number): number {
-        return Math.floor((i - 1) / 2);
-    }
-
-    _left(i: number): number {
-        return Math.floor((2 * i) + 1);
-    }
-
-    _right(i: number): number {
-        return Math.floor((2 * i) + 2);
-    }
-
-    _shouldSwap(childIdx: number, parentIdx: number): boolean {
-        return this._cmpFn(this._heap[childIdx], this._heap[parentIdx]) as number === this._order as number;
-    }
-
-    _swap(i: number, j: number) {
-        const tmp = this._heap[i];
-        this._heap[i] = this._heap[j];
-        this._heap[j] = tmp;
-    }
-
-    _heapify(i: number) {
-        const l = this._left(i);
-        const r = this._right(i);
-        let c = i;
-
-        if (l < this.size && this._shouldSwap(l, c)) {
-            c = l;
-        }
-
-        if (r < this.size && this._shouldSwap(r, c)) {
-            c = r;
-        }
-
-        if (c != i) {
-            this._swap(c, i);
-            this._heapify(c);
-        }
-    }
-
-    add(item: any): any {
-        if (this.size >= this._maxSize) {
-            return new Error('Max heap size reached');
-        }
-
-        ++this.size;
-        let c = this.size - 1;
-        this._heap[c] = item;
-
-        while (c > 0) {
-            if (!this._shouldSwap(c, this._parent(c))) {
-                return null;
-            }
-
-            this._swap(c, this._parent(c));
-            c = this._parent(c);
-        }
-
-        return null;
-    };
-
-    remove(): any {
-        if (this.size <= 0) {
-            return null;
-        }
-
-        const ret = this._heap[0];
-        this._heap[0] = this._heap[this.size - 1];
-        this._heapify(0);
-        --this.size;
-
-        return ret;
-    };
-
-    peek(): any {
-        if (this.size <= 0) {
-            return null;
-        }
-
-        return this._heap[0];
-    };
-}
-
-export class MinHeap extends Heap {
-    constructor(size: number, cmpFn: CompareFunction) {
-        super(size, HeapOrder.Min, cmpFn);
-    }
-}
-
-export class MaxHeap extends Heap {
-    constructor(size: number, cmpFn: CompareFunction) {
-        super(size, HeapOrder.Max, cmpFn);
-    }
-} 
-
--- a/lib/algos/list/Extension.js
+++ b/lib/algos/list/Extension.js
@ -1,6 +1,6 @@
 'use strict'; // eslint-disable-line strict

-const { FILTER_ACCEPT, SKIP_NONE } = require('./tools');
+const { FILTER_SKIP, SKIP_NONE } = require('./tools');

 // Use a heuristic to amortize the cost of JSON
 // serialization/deserialization only on largest metadata where the
@ -92,26 +92,21 @@ class Extension {
     * @param {object} entry - a listing entry from metadata
     *                         expected format: { key, value }
     * @return {number} - result of filtering the entry:
-     *                    FILTER_ACCEPT: entry is accepted and may or not be included
-     *                                   in the result
-     *                    FILTER_SKIP: listing may skip directly (with "gte" param) to
-     *                                 the key returned by the skipping() method
-     *                    FILTER_END: the results are complete, listing can be stopped
+     *                    > 0: entry is accepted and included in the result
+     *                    = 0: entry is accepted but not included (skipping)
+     *                    < 0: entry is not accepted, listing should finish
     */
-    filter(/* entry: { key, value } */) {
-        return FILTER_ACCEPT;
+    filter(entry) {
+        return entry ? FILTER_SKIP : FILTER_SKIP;
    }

    /**
-     * Provides the next key at which the listing task is allowed to skip to.
-     * This could allow to skip over:
-     * - a key prefix ending with the delimiter
-     * - all remaining versions of an object when doing a current
-     *   versions listing in v0 format
-     * - a cached "gap" of deleted objects when doing a current
-     *   versions listing in v0 format
+     * Provides the insight into why filter is skipping an entry. This could be
+     * because it is skipping a range of delimited keys or a range of specific
+     * version when doing master version listing.
     *
-     * @return {string} - the next key at which the listing task is allowed to skip to
+     * @return {string} - the insight: a common prefix or a master key,
+     *                                 or SKIP_NONE if there is no insight
     */
    skipping() {
        return SKIP_NONE;
--- a/lib/algos/list/MPU.js
+++ b/lib/algos/list/MPU.js
@ -1,7 +1,7 @@
 'use strict'; // eslint-disable-line strict

 const { inc, checkLimit, listingParamsMasterKeysV0ToV1,
-    FILTER_END, FILTER_ACCEPT, SKIP_NONE } = require('./tools');
+    FILTER_END, FILTER_ACCEPT } = require('./tools');
 const DEFAULT_MAX_KEYS = 1000;
 const VSConst = require('../../versioning/constants').VersioningConstants;
 const { DbPrefixes, BucketVersioningKeyFormat } = VSConst;
@ -163,7 +163,7 @@ class MultipartUploads {
    }

    skipping() {
-        return SKIP_NONE;
+        return '';
    }

    /**
--- a/lib/algos/list/basic.js
+++ b/lib/algos/list/basic.js
@ -2,7 +2,7 @@

 const Extension = require('./Extension').default;

-const { checkLimit, FILTER_END, FILTER_ACCEPT } = require('./tools');
+const { checkLimit, FILTER_END, FILTER_ACCEPT, FILTER_SKIP } = require('./tools');
 const DEFAULT_MAX_KEYS = 10000;

 /**
@ -91,7 +91,7 @@ class List extends Extension {
     *                     < 0 : listing done
     */
    filter(elem) {
-        // Check if the result array is full
+        // Check first in case of maxkeys <= 0
        if (this.keys >= this.maxKeys) {
            return FILTER_END;
        }
@ -99,7 +99,7 @@ class List extends Extension {
             this.filterKeyStartsWith !== undefined) &&
            typeof elem === 'object' &&
            !this.customFilter(elem.value)) {
-            return FILTER_ACCEPT;
+            return FILTER_SKIP;
        }
        if (typeof elem === 'object') {
            this.res.push({
--- a/lib/algos/list/delimiter.js
+++ b/lib/algos/list/delimiter.js
@ -0,0 +1,274 @@
+'use strict'; // eslint-disable-line strict
+
+const Extension = require('./Extension').default;
+const { inc, listingParamsMasterKeysV0ToV1,
+    FILTER_END, FILTER_ACCEPT, FILTER_SKIP } = require('./tools');
+const VSConst = require('../../versioning/constants').VersioningConstants;
+const { DbPrefixes, BucketVersioningKeyFormat } = VSConst;
+
+/**
+ * Find the common prefix in the path
+ *
+ * @param {String} key            - path of the object
+ * @param {String} delimiter      - separator
+ * @param {Number} delimiterIndex - 'folder' index in the path
+ * @return {String}               - CommonPrefix
+ */
+function getCommonPrefix(key, delimiter, delimiterIndex) {
+    return key.substring(0, delimiterIndex + delimiter.length);
+}
+
+/**
+ * Handle object listing with parameters
+ *
+ * @prop {String[]} CommonPrefixes     - 'folders' defined by the delimiter
+ * @prop {String[]} Contents           - 'files' to list
+ * @prop {Boolean} IsTruncated         - truncated listing flag
+ * @prop {String|undefined} NextMarker - marker per amazon format
+ * @prop {Number} keys                 - count of listed keys
+ * @prop {String|undefined} delimiter  - separator per amazon format
+ * @prop {String|undefined} prefix     - prefix per amazon format
+ * @prop {Number} maxKeys              - number of keys to list
+ */
+class Delimiter extends Extension {
+    /**
+     * Create a new Delimiter instance
+     * @constructor
+     * @param {Object}  parameters                     - listing parameters
+     * @param {String}  [parameters.delimiter]         - delimiter per amazon
+     *                                                   format
+     * @param {String}  [parameters.prefix]            - prefix per amazon
+     *                                                   format
+     * @param {String}  [parameters.marker]            - marker per amazon
+     *                                                   format
+     * @param {Number}  [parameters.maxKeys]           - number of keys to list
+     * @param {Boolean} [parameters.v2]                - indicates whether v2
+     *                                                   format
+     * @param {String}  [parameters.startAfter]        - marker per amazon
+     *                                                   format
+     * @param {String}  [parameters.continuationToken] - obfuscated amazon
+     *                                                   token
+     * @param {Boolean} [parameters.alphabeticalOrder] - Either the result is
+     *                                                   alphabetically ordered
+     *                                                   or not
+     * @param {RequestLogger} logger                   - The logger of the
+     *                                                   request
+     * @param {String} [vFormat]                       - versioning key format
+     */
+    constructor(parameters, logger, vFormat) {
+        super(parameters, logger);
+        // original listing parameters
+        this.delimiter = parameters.delimiter;
+        this.prefix = parameters.prefix;
+        this.marker = parameters.marker;
+        this.maxKeys = parameters.maxKeys || 1000;
+        this.startAfter = parameters.startAfter;
+        this.continuationToken = parameters.continuationToken;
+        this.alphabeticalOrder =
+          typeof parameters.alphabeticalOrder !== 'undefined' ?
+              parameters.alphabeticalOrder : true;
+
+        this.vFormat = vFormat || BucketVersioningKeyFormat.v0;
+        // results
+        this.CommonPrefixes = [];
+        this.Contents = [];
+        this.IsTruncated = false;
+        this.NextMarker = parameters.marker;
+        this.NextContinuationToken =
+            parameters.continuationToken || parameters.startAfter;
+
+        this.startMarker = parameters.v2 ? 'startAfter' : 'marker';
+        this.continueMarker = parameters.v2 ? 'continuationToken' : 'marker';
+        this.nextContinueMarker = parameters.v2 ?
+            'NextContinuationToken' : 'NextMarker';
+
+        if (this.delimiter !== undefined &&
+            this[this.nextContinueMarker] !== undefined &&
+            this[this.nextContinueMarker].startsWith(this.prefix || '')) {
+            const nextDelimiterIndex =
+                this[this.nextContinueMarker].indexOf(this.delimiter,
+                    this.prefix ? this.prefix.length : 0);
+            this[this.nextContinueMarker] =
+                this[this.nextContinueMarker].slice(0, nextDelimiterIndex +
+                                        this.delimiter.length);
+        }
+
+        Object.assign(this, {
+            [BucketVersioningKeyFormat.v0]: {
+                genMDParams: this.genMDParamsV0,
+                getObjectKey: this.getObjectKeyV0,
+                skipping: this.skippingV0,
+            },
+            [BucketVersioningKeyFormat.v1]: {
+                genMDParams: this.genMDParamsV1,
+                getObjectKey: this.getObjectKeyV1,
+                skipping: this.skippingV1,
+            },
+        }[this.vFormat]);
+    }
+
+    genMDParamsV0() {
+        const params = {};
+        if (this.prefix) {
+            params.gte = this.prefix;
+            params.lt = inc(this.prefix);
+        }
+        const startVal = this[this.continueMarker] || this[this.startMarker];
+        if (startVal) {
+            if (params.gte && params.gte > startVal) {
+                return params;
+            }
+            delete params.gte;
+            params.gt = startVal;
+        }
+        return params;
+    }
+
+    genMDParamsV1() {
+        const params = this.genMDParamsV0();
+        return listingParamsMasterKeysV0ToV1(params);
+    }
+
+    /**
+     * check if the max keys count has been reached and set the
+     * final state of the result if it is the case
+     * @return {Boolean} - indicates if the iteration has to stop
+     */
+    _reachedMaxKeys() {
+        if (this.keys >= this.maxKeys) {
+            // In cases of maxKeys <= 0 -> IsTruncated = false
+            this.IsTruncated = this.maxKeys > 0;
+            return true;
+        }
+        return false;
+    }
+
+    /**
+     *  Add a (key, value) tuple to the listing
+     *  Set the NextMarker to the current key
+     *  Increment the keys counter
+     *  @param {String} key   - The key to add
+     *  @param {String} value - The value of the key
+     *  @return {number}      - indicates if iteration should continue
+     */
+    addContents(key, value) {
+        if (this._reachedMaxKeys()) {
+            return FILTER_END;
+        }
+        this.Contents.push({ key, value: this.trimMetadata(value) });
+        this[this.nextContinueMarker] = key;
+        ++this.keys;
+        return FILTER_ACCEPT;
+    }
+
+    getObjectKeyV0(obj) {
+        return obj.key;
+    }
+
+    getObjectKeyV1(obj) {
+        return obj.key.slice(DbPrefixes.Master.length);
+    }
+
+    /**
+     *  Filter to apply on each iteration, based on:
+     *  - prefix
+     *  - delimiter
+     *  - maxKeys
+     *  The marker is being handled directly by levelDB
+     *  @param {Object} obj       - The key and value of the element
+     *  @param {String} obj.key   - The key of the element
+     *  @param {String} obj.value - The value of the element
+     *  @return {number}          - indicates if iteration should continue
+     */
+    filter(obj) {
+        const key = this.getObjectKey(obj);
+        const value = obj.value;
+        if ((this.prefix && !key.startsWith(this.prefix))
+            || (this.alphabeticalOrder
+                && typeof this[this.nextContinueMarker] === 'string'
+                && key <= this[this.nextContinueMarker])) {
+            return FILTER_SKIP;
+        }
+        if (this.delimiter) {
+            const baseIndex = this.prefix ? this.prefix.length : 0;
+            const delimiterIndex = key.indexOf(this.delimiter, baseIndex);
+            if (delimiterIndex === -1) {
+                return this.addContents(key, value);
+            }
+            return this.addCommonPrefix(key, delimiterIndex);
+        }
+        return this.addContents(key, value);
+    }
+
+    /**
+     * Add a Common Prefix in the list
+     * @param {String} key   - object name
+     * @param {Number} index - after prefix starting point
+     * @return {Boolean}     - indicates if iteration should continue
+     */
+    addCommonPrefix(key, index) {
+        const commonPrefix = getCommonPrefix(key, this.delimiter, index);
+        if (this.CommonPrefixes.indexOf(commonPrefix) === -1
+                && this[this.nextContinueMarker] !== commonPrefix) {
+            if (this._reachedMaxKeys()) {
+                return FILTER_END;
+            }
+            this.CommonPrefixes.push(commonPrefix);
+            this[this.nextContinueMarker] = commonPrefix;
+            ++this.keys;
+            return FILTER_ACCEPT;
+        }
+        return FILTER_SKIP;
+    }
+
+    /**
+     * If repd happens to want to skip listing on a bucket in v0
+     * versioning key format, here is an idea.
+     *
+     * @return {string} - the present range (NextMarker) if repd believes
+     *                    that it's enough and should move on
+     */
+    skippingV0() {
+        return this[this.nextContinueMarker];
+    }
+
+    /**
+     * If repd happens to want to skip listing on a bucket in v1
+     * versioning key format, here is an idea.
+     *
+     * @return {string} - the present range (NextMarker) if repd believes
+     *                    that it's enough and should move on
+     */
+    skippingV1() {
+        return DbPrefixes.Master + this[this.nextContinueMarker];
+    }
+
+    /**
+     *  Return an object containing all mandatory fields to use once the
+     *  iteration is done, doesn't show a NextMarker field if the output
+     *  isn't truncated
+     *  @return {Object} - following amazon format
+     */
+    result() {
+        /* NextMarker is only provided when delimiter is used.
+         * specified in v1 listing documentation
+         * http://docs.aws.amazon.com/AmazonS3/latest/API/RESTBucketGET.html
+         */
+        const result = {
+            CommonPrefixes: this.CommonPrefixes,
+            Contents: this.Contents,
+            IsTruncated: this.IsTruncated,
+            Delimiter: this.delimiter,
+        };
+        if (this.parameters.v2) {
+            result.NextContinuationToken = this.IsTruncated
+                ? this.NextContinuationToken : undefined;
+        } else {
+            result.NextMarker = (this.IsTruncated && this.delimiter)
+                ? this.NextMarker : undefined;
+        }
+        return result;
+    }
+}
+
+module.exports = { Delimiter };
--- a/lib/algos/list/delimiter.ts
+++ b/lib/algos/list/delimiter.ts
@ -1,356 +0,0 @@
-'use strict'; // eslint-disable-line strict
-
-const Extension = require('./Extension').default;
-const { inc, listingParamsMasterKeysV0ToV1,
-    FILTER_END, FILTER_ACCEPT, FILTER_SKIP, SKIP_NONE } = require('./tools');
-const VSConst = require('../../versioning/constants').VersioningConstants;
-const { DbPrefixes, BucketVersioningKeyFormat } = VSConst;
-
-export interface FilterState {
-    id: number,
-};
-
-export interface FilterReturnValue {
-    FILTER_ACCEPT,
-    FILTER_SKIP,
-    FILTER_END,
-};
-
-export const enum DelimiterFilterStateId {
-    NotSkipping = 1,
-    SkippingPrefix = 2,
-};
-
-export interface DelimiterFilterState_NotSkipping extends FilterState {
-    id: DelimiterFilterStateId.NotSkipping,
-};
-
-export interface DelimiterFilterState_SkippingPrefix extends FilterState {
-    id: DelimiterFilterStateId.SkippingPrefix,
-    prefix: string;
-};
-
-type KeyHandler = (key: string, value: string) => FilterReturnValue;
-
-export type ResultObject = {
-    CommonPrefixes: string[];
-    Contents: {
-        key: string;
-        value: string;
-    }[];
-    IsTruncated: boolean;
-    Delimiter ?: string;
-    NextMarker ?: string;
-    NextContinuationToken ?: string;
-};
-
-/**
- * Handle object listing with parameters
- *
- * @prop {String[]} CommonPrefixes     - 'folders' defined by the delimiter
- * @prop {String[]} Contents           - 'files' to list
- * @prop {Boolean} IsTruncated         - truncated listing flag
- * @prop {String|undefined} NextMarker - marker per amazon format
- * @prop {Number} keys                 - count of listed keys
- * @prop {String|undefined} delimiter  - separator per amazon format
- * @prop {String|undefined} prefix     - prefix per amazon format
- * @prop {Number} maxKeys              - number of keys to list
- */
-export class Delimiter extends Extension {
-
-    state: FilterState;
-    keyHandlers: { [id: number]: KeyHandler };
-
-    /**
-     * Create a new Delimiter instance
-     * @constructor
-     * @param {Object}  parameters                     - listing parameters
-     * @param {String}  [parameters.delimiter]         - delimiter per amazon
-     *                                                   format
-     * @param {String}  [parameters.prefix]            - prefix per amazon
-     *                                                   format
-     * @param {String}  [parameters.marker]            - marker per amazon
-     *                                                   format
-     * @param {Number}  [parameters.maxKeys]           - number of keys to list
-     * @param {Boolean} [parameters.v2]                - indicates whether v2
-     *                                                   format
-     * @param {String}  [parameters.startAfter]        - marker per amazon
-     *                                                   format
-     * @param {String}  [parameters.continuationToken] - obfuscated amazon
-     *                                                   token
-     * @param {RequestLogger} logger                   - The logger of the
-     *                                                   request
-     * @param {String} [vFormat]                       - versioning key format
-     */
-    constructor(parameters, logger, vFormat) {
-        super(parameters, logger);
-        // original listing parameters
-        this.delimiter = parameters.delimiter;
-        this.prefix = parameters.prefix;
-        this.maxKeys = parameters.maxKeys || 1000;
-
-        if (parameters.v2) {
-            this.marker = parameters.continuationToken || parameters.startAfter;
-        } else {
-            this.marker = parameters.marker;
-        }
-        this.nextMarker = this.marker;
-
-        this.vFormat = vFormat || BucketVersioningKeyFormat.v0;
-        // results
-        this.CommonPrefixes = [];
-        this.Contents = [];
-        this.IsTruncated = false;
-        this.keyHandlers = {};
-
-        Object.assign(this, {
-            [BucketVersioningKeyFormat.v0]: {
-                genMDParams: this.genMDParamsV0,
-                getObjectKey: this.getObjectKeyV0,
-                skipping: this.skippingV0,
-            },
-            [BucketVersioningKeyFormat.v1]: {
-                genMDParams: this.genMDParamsV1,
-                getObjectKey: this.getObjectKeyV1,
-                skipping: this.skippingV1,
-            },
-        }[this.vFormat]);
-
-        // if there is a delimiter, we may skip ranges by prefix,
-        // hence using the NotSkippingPrefix flavor that checks the
-        // subprefix up to the delimiter for the NotSkipping state
-        if (this.delimiter) {
-            this.setKeyHandler(
-                DelimiterFilterStateId.NotSkipping,
-                this.keyHandler_NotSkippingPrefix.bind(this));
-        } else {
-            // listing without a delimiter never has to skip over any
-            // prefix -> use NeverSkipping flavor for the NotSkipping
-            // state
-            this.setKeyHandler(
-                DelimiterFilterStateId.NotSkipping,
-                this.keyHandler_NeverSkipping.bind(this));
-        }
-        this.setKeyHandler(
-            DelimiterFilterStateId.SkippingPrefix,
-            this.keyHandler_SkippingPrefix.bind(this));
-
-        this.state = <DelimiterFilterState_NotSkipping> {
-            id: DelimiterFilterStateId.NotSkipping,
-        };
-    }
-
-    genMDParamsV0() {
-        const params: { gt ?: string, gte ?: string, lt ?: string } = {};
-        if (this.prefix) {
-            params.gte = this.prefix;
-            params.lt = inc(this.prefix);
-        }
-        if (this.marker && this.delimiter) {
-            const commonPrefix = this.getCommonPrefix(this.marker);
-            if (commonPrefix) {
-                const afterPrefix = inc(commonPrefix);
-                if (!params.gte || afterPrefix > params.gte) {
-                    params.gte = afterPrefix;
-                }
-            }
-        }
-        if (this.marker && (!params.gte || this.marker >= params.gte)) {
-            delete params.gte;
-            params.gt = this.marker;
-        }
-        return params;
-    }
-
-    genMDParamsV1() {
-        const params = this.genMDParamsV0();
-        return listingParamsMasterKeysV0ToV1(params);
-    }
-
-    /**
-     * check if the max keys count has been reached and set the
-     * final state of the result if it is the case
-     * @return {Boolean} - indicates if the iteration has to stop
-     */
-    _reachedMaxKeys(): boolean {
-        if (this.keys >= this.maxKeys) {
-            // In cases of maxKeys <= 0 -> IsTruncated = false
-            this.IsTruncated = this.maxKeys > 0;
-            return true;
-        }
-        return false;
-    }
-
-    /**
-     *  Add a (key, value) tuple to the listing
-     *  Set the NextMarker to the current key
-     *  Increment the keys counter
-     *  @param {String} key   - The key to add
-     *  @param {String} value - The value of the key
-     *  @return {number}      - indicates if iteration should continue
-     */
-    addContents(key: string, value: string): void {
-        this.Contents.push({ key, value: this.trimMetadata(value) });
-        ++this.keys;
-        this.nextMarker = key;
-    }
-
-    getCommonPrefix(key: string): string | undefined {
-        if (!this.delimiter) {
-            return undefined;
-        }
-        const baseIndex = this.prefix ? this.prefix.length : 0;
-        const delimiterIndex = key.indexOf(this.delimiter, baseIndex);
-        if (delimiterIndex === -1) {
-            return undefined;
-        }
-        return key.substring(0, delimiterIndex + this.delimiter.length);
-    }
-
-    /**
-     * Add a Common Prefix in the list
-     * @param {String} commonPrefix   - common prefix to add
-     * @param {String} key            - full key starting with commonPrefix
-     * @return {Boolean}     - indicates if iteration should continue
-     */
-    addCommonPrefix(commonPrefix: string, key: string): void {
-        // add the new prefix to the list
-        this.CommonPrefixes.push(commonPrefix);
-        ++this.keys;
-        this.nextMarker = commonPrefix;
-    }
-
-    addCommonPrefixOrContents(key: string, value: string): string | undefined {
-        // add the subprefix to the common prefixes if the key has the delimiter
-        const commonPrefix = this.getCommonPrefix(key);
-        if (commonPrefix) {
-            this.addCommonPrefix(commonPrefix, key);
-            return commonPrefix;
-        }
-        this.addContents(key, value);
-        return undefined;
-    }
-
-    getObjectKeyV0(obj: { key: string }): string {
-        return obj.key;
-    }
-
-    getObjectKeyV1(obj: { key: string }): string {
-        return obj.key.slice(DbPrefixes.Master.length);
-    }
-
-    /**
-     *  Filter to apply on each iteration, based on:
-     *  - prefix
-     *  - delimiter
-     *  - maxKeys
-     *  The marker is being handled directly by levelDB
-     *  @param {Object} obj       - The key and value of the element
-     *  @param {String} obj.key   - The key of the element
-     *  @param {String} obj.value - The value of the element
-     *  @return {number}          - indicates if iteration should continue
-     */
-    filter(obj: { key: string, value: string }): FilterReturnValue {
-        const key = this.getObjectKey(obj);
-        const value = obj.value;
-
-        return this.handleKey(key, value);
-    }
-
-    setState(state: FilterState): void {
-        this.state = state;
-    }
-
-    setKeyHandler(stateId: number, keyHandler: KeyHandler): void {
-        this.keyHandlers[stateId] = keyHandler;
-    }
-
-    handleKey(key: string, value: string): FilterReturnValue {
-        return this.keyHandlers[this.state.id](key, value);
-    }
-
-    keyHandler_NeverSkipping(key: string, value: string): FilterReturnValue {
-        if (this._reachedMaxKeys()) {
-            return FILTER_END;
-        }
-        this.addContents(key, value);
-        return FILTER_ACCEPT;
-    }
-
-    keyHandler_NotSkippingPrefix(key: string, value: string): FilterReturnValue {
-        if (this._reachedMaxKeys()) {
-            return FILTER_END;
-        }
-        const commonPrefix = this.addCommonPrefixOrContents(key, value);
-        if (commonPrefix) {
-            // transition into SkippingPrefix state to skip all following keys
-            // while they start with the same prefix
-            this.setState(<DelimiterFilterState_SkippingPrefix> {
-                id: DelimiterFilterStateId.SkippingPrefix,
-                prefix: commonPrefix,
-            });
-        }
-        return FILTER_ACCEPT;
-    }
-
-    keyHandler_SkippingPrefix(key: string, value: string): FilterReturnValue {
-        const { prefix } = <DelimiterFilterState_SkippingPrefix> this.state;
-        if (key.startsWith(prefix)) {
-            return FILTER_SKIP;
-        }
-        this.setState(<DelimiterFilterState_NotSkipping> {
-            id: DelimiterFilterStateId.NotSkipping,
-        });
-        return this.handleKey(key, value);
-    }
-
-    skippingBase(): string | undefined {
-        switch (this.state.id) {
-        case DelimiterFilterStateId.SkippingPrefix:
-            const { prefix } = <DelimiterFilterState_SkippingPrefix> this.state;
-            return inc(prefix);
-
-        default:
-            return SKIP_NONE;
-        }
-    }
-
-    skippingV0() {
-        return this.skippingBase();
-    }
-
-    skippingV1() {
-        const skipTo = this.skippingBase();
-        if (skipTo === SKIP_NONE) {
-            return SKIP_NONE;
-        }
-        return DbPrefixes.Master + skipTo;
-    }
-
-    /**
-     *  Return an object containing all mandatory fields to use once the
-     *  iteration is done, doesn't show a NextMarker field if the output
-     *  isn't truncated
-     *  @return {Object} - following amazon format
-     */
-    result(): ResultObject {
-        /* NextMarker is only provided when delimiter is used.
-         * specified in v1 listing documentation
-         * http://docs.aws.amazon.com/AmazonS3/latest/API/RESTBucketGET.html
-         */
-        const result: ResultObject = {
-            CommonPrefixes: this.CommonPrefixes,
-            Contents: this.Contents,
-            IsTruncated: this.IsTruncated,
-            Delimiter: this.delimiter,
-        };
-        if (this.parameters.v2) {
-            result.NextContinuationToken = this.IsTruncated
-                ? this.nextMarker : undefined;
-        } else {
-            result.NextMarker = (this.IsTruncated && this.delimiter)
-                ? this.nextMarker : undefined;
-        }
-        return result;
-    }
-}
--- a/lib/algos/list/delimiterCurrent.ts
+++ b/lib/algos/list/delimiterCurrent.ts
@ -1,127 +0,0 @@
-const { DelimiterMaster } = require('./delimiterMaster');
-const { FILTER_ACCEPT, FILTER_END } = require('./tools');
-
-type ResultObject = {
-    Contents: {
-        key: string;
-        value: string;
-    }[];
-    IsTruncated: boolean;
-    NextMarker ?: string;
-};
-
-/**
- * Handle object listing with parameters. This extends the base class DelimiterMaster
- * to return the master/current versions.
- */
-class DelimiterCurrent extends DelimiterMaster {
-    /**
-     * Delimiter listing of current versions.
-     * @param {Object}  parameters            - listing parameters
-     * @param {String}  parameters.beforeDate - limit the response to keys older than beforeDate
-     * @param {String}  parameters.excludedDataStoreName - excluded datatore name
-     * @param {Number} parameters.maxScannedLifecycleListingEntries - max number of entries to be scanned
-     * @param {RequestLogger} logger          - The logger of the request
-     * @param {String} [vFormat]              - versioning key format
-     */
-    constructor(parameters, logger, vFormat) {
-        super(parameters, logger, vFormat);
-
-        this.beforeDate = parameters.beforeDate;
-        this.excludedDataStoreName = parameters.excludedDataStoreName;
-        this.maxScannedLifecycleListingEntries = parameters.maxScannedLifecycleListingEntries;
-        this.scannedKeys = 0;
-    }
-
-    genMDParamsV0() {
-        const params = super.genMDParamsV0();
-        // lastModified and dataStoreName parameters are used by metadata that enables built-in filtering, 
-        // a feature currently exclusive to MongoDB
-        if (this.beforeDate) {
-            params.lastModified = {
-                lt: this.beforeDate,
-            };
-        }
-
-        if (this.excludedDataStoreName) {
-            params.dataStoreName = {
-                ne: this.excludedDataStoreName,
-            }
-        }
-
-        return params;
-    }
-
-    /**
-     * Parses the stringified entry's value.
-     * @param s - sringified value
-     * @return - undefined if parsing fails, otherwise it contains the parsed value.
-     */
-    _parse(s) {
-        let p;
-        try {
-            p = JSON.parse(s);
-        } catch (e: any) {
-            this.logger.warn(
-                'Could not parse Object Metadata while listing',
-                { err: e.toString() });
-        }
-        return p;
-    }
-
-    /**
-     * check if the max keys count has been reached and set the
-     * final state of the result if it is the case
-     *
-     * specialized implementation on DelimiterCurrent to also check
-     * the number of scanned keys
-     *
-     * @return {Boolean} - indicates if the iteration has to stop
-     */
-    _reachedMaxKeys(): boolean {
-        if (this.maxScannedLifecycleListingEntries && this.scannedKeys >= this.maxScannedLifecycleListingEntries) {
-            this.IsTruncated = true;
-            this.logger.info('listing stopped due to reaching the maximum scanned entries limit',
-                {
-                    maxScannedLifecycleListingEntries: this.maxScannedLifecycleListingEntries,
-                    scannedKeys: this.scannedKeys,
-                });
-            return true;
-        }
-        return super._reachedMaxKeys();
-    }
-
-    addContents(key, value) {
-        ++this.scannedKeys;
-        const parsedValue = this._parse(value);
-        // if parsing fails, skip the key.
-        if (parsedValue) {
-            const lastModified = parsedValue['last-modified'];
-            const dataStoreName = parsedValue.dataStoreName;
-            // We then check if the current version is older than the "beforeDate" and
-            // "excludedDataStoreName" is not specified or if specified and the data store name is different.
-            if ((!this.beforeDate || (lastModified && lastModified < this.beforeDate)) &&
-                (!this.excludedDataStoreName || dataStoreName !== this.excludedDataStoreName)) {
-                super.addContents(key, value);
-            }
-            // In the event of a timeout occurring before any content is added,
-            // NextMarker is updated even if the object is not eligible.
-            // It minimizes the amount of data that the client needs to re-process if the request times out.
-            this.nextMarker = key;
-        }
-    }
-
-    result(): object {
-        const result: ResultObject = {
-            Contents: this.Contents,
-            IsTruncated: this.IsTruncated,
-        };
-
-        if (this.IsTruncated) {
-            result.NextMarker = this.nextMarker;
-        }
-
-        return result;
-    }
-}
-module.exports = { DelimiterCurrent };
--- a/lib/algos/list/delimiterMaster.js
+++ b/lib/algos/list/delimiterMaster.js
@ -0,0 +1,196 @@
+'use strict'; // eslint-disable-line strict
+
+const Delimiter = require('./delimiter').Delimiter;
+const Version = require('../../versioning/Version').Version;
+const VSConst = require('../../versioning/constants').VersioningConstants;
+const { BucketVersioningKeyFormat } = VSConst;
+const { FILTER_ACCEPT, FILTER_SKIP, SKIP_NONE } = require('./tools');
+
+const VID_SEP = VSConst.VersionId.Separator;
+const { DbPrefixes } = VSConst;
+
+/**
+ * Handle object listing with parameters. This extends the base class Delimiter
+ * to return the raw master versions of existing objects.
+ */
+class DelimiterMaster extends Delimiter {
+    /**
+     * Delimiter listing of master versions.
+     * @param {Object}  parameters            - listing parameters
+     * @param {String}  parameters.delimiter  - delimiter per amazon format
+     * @param {String}  parameters.prefix     - prefix per amazon format
+     * @param {String}  parameters.marker     - marker per amazon format
+     * @param {Number}  parameters.maxKeys    - number of keys to list
+     * @param {Boolean} parameters.v2         - indicates whether v2 format
+     * @param {String}  parameters.startAfter - marker per amazon v2 format
+     * @param {String}  parameters.continuationToken - obfuscated amazon token
+     * @param {RequestLogger} logger          - The logger of the request
+     * @param {String} [vFormat]              - versioning key format
+     */
+    constructor(parameters, logger, vFormat) {
+        super(parameters, logger, vFormat);
+        // non-PHD master version or a version whose master is a PHD version
+        this.prvKey = undefined;
+        this.prvPHDKey = undefined;
+        this.inReplayPrefix = false;
+
+        Object.assign(this, {
+            [BucketVersioningKeyFormat.v0]: {
+                filter: this.filterV0,
+                skipping: this.skippingV0,
+            },
+            [BucketVersioningKeyFormat.v1]: {
+                filter: this.filterV1,
+                skipping: this.skippingV1,
+            },
+        }[this.vFormat]);
+    }
+
+    /**
+     *  Filter to apply on each iteration for buckets in v0 format,
+     *  based on:
+     *  - prefix
+     *  - delimiter
+     *  - maxKeys
+     *  The marker is being handled directly by levelDB
+     *  @param {Object} obj       - The key and value of the element
+     *  @param {String} obj.key   - The key of the element
+     *  @param {String} obj.value - The value of the element
+     *  @return {number}          - indicates if iteration should continue
+     */
+    filterV0(obj) {
+        let key = obj.key;
+        const value = obj.value;
+
+        if (key.startsWith(DbPrefixes.Replay)) {
+            this.inReplayPrefix = true;
+            return FILTER_SKIP;
+        }
+        this.inReplayPrefix = false;
+
+        /* Skip keys not starting with the prefix or not alphabetically
+         * ordered. */
+        if ((this.prefix && !key.startsWith(this.prefix))
+                || (typeof this[this.nextContinueMarker] === 'string' &&
+                    key <= this[this.nextContinueMarker])) {
+            return FILTER_SKIP;
+        }
+
+        /* Skip version keys (<key><versionIdSeparator><version>) if we already
+         * have a master version. */
+        const versionIdIndex = key.indexOf(VID_SEP);
+        if (versionIdIndex >= 0) {
+            key = key.slice(0, versionIdIndex);
+            /* - key === this.prvKey is triggered when a master version has
+             *   been accepted for this key,
+             * - key === this.NextMarker or this.NextContinueToken is triggered
+             *   when a listing page ends on an accepted obj and the next page
+             *   starts with a version of this object.
+             *   In that case prvKey is default set to undefined
+             *   in the constructor and comparing to NextMarker is the only
+             *   way to know  we should not accept this version. This test is
+             *   not redundant with the one at the beginning of this function,
+             *   we are comparing here the key without the version suffix,
+             * - key startsWith the previous NextMarker happens because we set
+             *   NextMarker to the common prefix instead of the whole key
+             *   value. (TODO: remove this test once ZENKO-1048 is fixed)
+             *   */
+            if (key === this.prvKey || key === this[this.nextContinueMarker] ||
+                (this.delimiter &&
+                key.startsWith(this[this.nextContinueMarker]))) {
+                /* master version already filtered */
+                return FILTER_SKIP;
+            }
+        }
+        if (Version.isPHD(value)) {
+            /* master version is a PHD version, we want to wait for the next
+             * one:
+             * - Set the prvKey to undefined to not skip the next version,
+             * - return accept to avoid users to skip the next values in range
+             *   (skip scan mechanism in metadata backend like Metadata or
+             *   MongoClient). */
+            this.prvKey = undefined;
+            this.prvPHDKey = key;
+            return FILTER_ACCEPT;
+        }
+        if (Version.isDeleteMarker(value)) {
+            /* This entry is a deleteMarker which has not been filtered by the
+             * version test. Either :
+             * - it is a deleteMarker on the master version, we want to SKIP
+             *   all the following entries with this key (no master version),
+             * - or a deleteMarker following a PHD (setting prvKey to undefined
+             *   when an entry is a PHD avoids the skip on version for the
+             *   next entry). In that case we expect the master version to
+             *   follow. */
+            if (key === this.prvPHDKey) {
+                this.prvKey = undefined;
+                return FILTER_ACCEPT;
+            }
+            this.prvKey = key;
+            return FILTER_SKIP;
+        }
+
+        this.prvKey = key;
+        if (this.delimiter) {
+            // check if the key has the delimiter
+            const baseIndex = this.prefix ? this.prefix.length : 0;
+            const delimiterIndex = key.indexOf(this.delimiter, baseIndex);
+            if (delimiterIndex >= 0) {
+                // try to add the prefix to the list
+                return this.addCommonPrefix(key, delimiterIndex);
+            }
+        }
+        return this.addContents(key, value);
+    }
+
+    /**
+     *  Filter to apply on each iteration for buckets in v1 format,
+     *  based on:
+     *  - prefix
+     *  - delimiter
+     *  - maxKeys
+     *  The marker is being handled directly by levelDB
+     *  @param {Object} obj       - The key and value of the element
+     *  @param {String} obj.key   - The key of the element
+     *  @param {String} obj.value - The value of the element
+     *  @return {number}          - indicates if iteration should continue
+     */
+    filterV1(obj) {
+        // Filtering master keys in v1 is simply listing the master
+        // keys, as the state of version keys do not change the
+        // result, so we can use Delimiter method directly.
+        return super.filter(obj);
+    }
+
+    skippingBase() {
+        if (this[this.nextContinueMarker]) {
+            // next marker or next continuation token:
+            // - foo/ : skipping foo/
+            // - foo  : skipping foo.
+            const index = this[this.nextContinueMarker].
+                lastIndexOf(this.delimiter);
+            if (index === this[this.nextContinueMarker].length - 1) {
+                return this[this.nextContinueMarker];
+            }
+            return this[this.nextContinueMarker] + VID_SEP;
+        }
+        return SKIP_NONE;
+    }
+
+    skippingV0() {
+        if (this.inReplayPrefix) {
+            return DbPrefixes.Replay;
+        }
+        return this.skippingBase();
+    }
+
+    skippingV1() {
+        const skipTo = this.skippingBase();
+        if (skipTo === SKIP_NONE) {
+            return SKIP_NONE;
+        }
+        return DbPrefixes.Master + skipTo;
+    }
+}
+
+module.exports = { DelimiterMaster };
--- a/lib/algos/list/delimiterMaster.ts
+++ b/lib/algos/list/delimiterMaster.ts
@ -1,620 +0,0 @@
-import {
-    Delimiter,
-    FilterState,
-    FilterReturnValue,
-    DelimiterFilterStateId,
-    DelimiterFilterState_NotSkipping,
-    DelimiterFilterState_SkippingPrefix,
-    ResultObject,
-} from './delimiter';
-const Version = require('../../versioning/Version').Version;
-const VSConst = require('../../versioning/constants').VersioningConstants;
-const { BucketVersioningKeyFormat } = VSConst;
-const { FILTER_ACCEPT, FILTER_SKIP, FILTER_END, SKIP_NONE, inc } = require('./tools');
-
-import { GapSetEntry } from '../cache/GapSet';
-import { GapCacheInterface } from '../cache/GapCache';
-
-const VID_SEP = VSConst.VersionId.Separator;
-const { DbPrefixes } = VSConst;
-
-export const enum DelimiterMasterFilterStateId {
-    SkippingVersionsV0 = 101,
-    WaitVersionAfterPHDV0 = 102,
-    SkippingGapV0 = 103,
-};
-
-interface DelimiterMasterFilterState_SkippingVersionsV0 extends FilterState {
-    id: DelimiterMasterFilterStateId.SkippingVersionsV0,
-    masterKey: string,
-};
-
-interface DelimiterMasterFilterState_WaitVersionAfterPHDV0 extends FilterState {
-    id: DelimiterMasterFilterStateId.WaitVersionAfterPHDV0,
-    masterKey: string,
-};
-
-interface DelimiterMasterFilterState_SkippingGapV0 extends FilterState {
-    id: DelimiterMasterFilterStateId.SkippingGapV0,
-};
-
-export const enum GapCachingState {
-    NoGapCache = 0, // there is no gap cache
-    UnknownGap = 1, // waiting for a cache lookup
-    GapLookupInProgress = 2, // asynchronous gap lookup in progress
-    GapCached = 3, // an upcoming or already skippable gap is cached
-    NoMoreGap = 4, // the cache doesn't have any more gaps inside the listed range
-};
-
-type GapCachingInfo_NoGapCache = {
-    state: GapCachingState.NoGapCache;
-};
-
-type GapCachingInfo_NoCachedGap = {
-    state: GapCachingState.UnknownGap
-        | GapCachingState.GapLookupInProgress
-    gapCache: GapCacheInterface;
-};
-
-type GapCachingInfo_GapCached = {
-    state: GapCachingState.GapCached;
-    gapCache: GapCacheInterface;
-    gapCached: GapSetEntry;
-};
-
-type GapCachingInfo_NoMoreGap = {
-    state: GapCachingState.NoMoreGap;
-};
-
-type GapCachingInfo = GapCachingInfo_NoGapCache
-    | GapCachingInfo_NoCachedGap
-    | GapCachingInfo_GapCached
-    | GapCachingInfo_NoMoreGap;
-
-
-export const enum GapBuildingState {
-    Disabled = 0, // no gap cache or no gap building needed (e.g. in V1 versioning format)
-    NotBuilding = 1, // not currently building a gap (i.e. not listing within a gap)
-    Building = 2, // currently building a gap (i.e. listing within a gap)
-    Expired = 3, // not allowed to build due to exposure delay timeout
-};
-
-type GapBuildingInfo_NothingToBuild = {
-    state: GapBuildingState.Disabled | GapBuildingState.Expired;
-};
-
-type GapBuildingParams = {
-    /**
-     * minimum weight for a gap to be created in the cache
-     */
-    minGapWeight: number;
-    /**
-     * trigger a cache setGap() call every N skippable keys
-     */
-    triggerSaveGapWeight: number;
-    /**
-     * timestamp to assess whether we're still inside the validity period to
-     * be allowed to build gaps
-     */
-    initTimestamp: number;
-};
-
-type GapBuildingInfo_NotBuilding = {
-    state: GapBuildingState.NotBuilding;
-    gapCache: GapCacheInterface;
-    params: GapBuildingParams;
-};
-
-type GapBuildingInfo_Building = {
-    state: GapBuildingState.Building;
-    gapCache: GapCacheInterface;
-    params: GapBuildingParams;
-    /**
-     * Gap currently being created
-     */
-    gap: GapSetEntry;
-    /**
-     * total current weight of the gap being created
-     */
-    gapWeight: number;
-};
-
-type GapBuildingInfo = GapBuildingInfo_NothingToBuild
-    | GapBuildingInfo_NotBuilding
-    | GapBuildingInfo_Building;
-
-/**
- * Handle object listing with parameters. This extends the base class Delimiter
- * to return the raw master versions of existing objects.
- */
-export class DelimiterMaster extends Delimiter {
-
-    _gapCaching: GapCachingInfo;
-    _gapBuilding: GapBuildingInfo;
-    _refreshedBuildingParams: GapBuildingParams | null;
-
-    /**
-     * Delimiter listing of master versions.
-     * @param {Object}  parameters            - listing parameters
-     * @param {String}  [parameters.delimiter]  - delimiter per amazon format
-     * @param {String}  [parameters.prefix]     - prefix per amazon format
-     * @param {String}  [parameters.marker]     - marker per amazon format
-     * @param {Number}  [parameters.maxKeys]    - number of keys to list
-     * @param {Boolean} [parameters.v2]         - indicates whether v2 format
-     * @param {String}  [parameters.startAfter] - marker per amazon v2 format
-     * @param {String}  [parameters.continuationToken] - obfuscated amazon token
-     * @param {RequestLogger} logger            - The logger of the request
-     * @param {String}  [vFormat="v0"]          - versioning key format
-     */
-    constructor(parameters, logger, vFormat?: string) {
-        super(parameters, logger, vFormat);
-
-        if (this.vFormat === BucketVersioningKeyFormat.v0) {
-            // override Delimiter's implementation of NotSkipping for
-            // DelimiterMaster logic (skipping versions and special
-            // handling of delete markers and PHDs)
-            this.setKeyHandler(
-                DelimiterFilterStateId.NotSkipping,
-                this.keyHandler_NotSkippingPrefixNorVersionsV0.bind(this));
-
-            // add extra state handlers specific to DelimiterMaster with v0 format
-            this.setKeyHandler(
-                DelimiterMasterFilterStateId.SkippingVersionsV0,
-                this.keyHandler_SkippingVersionsV0.bind(this));
-
-            this.setKeyHandler(
-                DelimiterMasterFilterStateId.WaitVersionAfterPHDV0,
-                this.keyHandler_WaitVersionAfterPHDV0.bind(this));
-
-            this.setKeyHandler(
-                DelimiterMasterFilterStateId.SkippingGapV0,
-                this.keyHandler_SkippingGapV0.bind(this));
-
-            if (this.marker) {
-                // distinct initial state to include some special logic
-                // before the first master key is found that does not have
-                // to be checked afterwards
-                this.state = <DelimiterMasterFilterState_SkippingVersionsV0> {
-                    id: DelimiterMasterFilterStateId.SkippingVersionsV0,
-                    masterKey: this.marker,
-                };
-            } else {
-                this.state = <DelimiterFilterState_NotSkipping> {
-                    id: DelimiterFilterStateId.NotSkipping,
-                };
-            }
-        } else {
-            // save base implementation of the `NotSkipping` state in
-            // Delimiter before overriding it with ours, to be able to call it from there
-            this.keyHandler_NotSkipping_Delimiter = this.keyHandlers[DelimiterFilterStateId.NotSkipping];
-            this.setKeyHandler(
-                DelimiterFilterStateId.NotSkipping,
-                this.keyHandler_NotSkippingPrefixNorVersionsV1.bind(this));
-        }
-        // in v1, we can directly use Delimiter's implementation,
-        // which is already set to the proper state
-
-        // default initialization of the gap cache and building states, can be
-        // set by refreshGapCache()
-        this._gapCaching = {
-            state: GapCachingState.NoGapCache,
-        };
-        this._gapBuilding = {
-            state: GapBuildingState.Disabled,
-        };
-        this._refreshedBuildingParams = null;
-    }
-
-    /**
-     * Get the validity period left before a refresh of the gap cache is needed
-     * to continue building new gaps.
-     *
-     * @return {number|null} one of:
-     * - the remaining time in milliseconds in which gaps can be added to the
-     *   cache before a call to refreshGapCache() is required
-     * - or 0 if there is no time left and a call to refreshGapCache() is required
-     *   to resume caching gaps
-     * - or null if refreshing the cache is never needed (because the gap cache
-     *   is either not available or not used)
-     */
-    getGapBuildingValidityPeriodMs(): number | null {
-        let gapBuilding;
-        switch (this._gapBuilding.state) {
-        case GapBuildingState.Disabled:
-            return null;
-        case GapBuildingState.Expired:
-            return 0;
-        case GapBuildingState.NotBuilding:
-            gapBuilding = <GapBuildingInfo_NotBuilding> this._gapBuilding;
-            break;
-        case GapBuildingState.Building:
-            gapBuilding = <GapBuildingInfo_Building> this._gapBuilding;
-            break;
-        }
-        const { gapCache, params } = gapBuilding;
-        const elapsedTime = Date.now() - params.initTimestamp;
-        return Math.max(gapCache.exposureDelayMs - elapsedTime, 0);
-    }
-
-    /**
-     * Refresh the gaps caching logic (gaps are series of current delete markers
-     * in V0 bucket metadata format). It has two effects:
-     *
-     * - starts exposing existing and future gaps from the cache to efficiently
-     *   skip over series of current delete markers that have been seen and cached
-     *   earlier
-     *
-     * - enables building and caching new gaps (or extend existing ones), for a
-     *   limited time period defined by the `gapCacheProxy.exposureDelayMs` value
-     *   in milliseconds. To refresh the validity period and resume building and
-     *   caching new gaps, one must restart a new listing from the database (starting
-     *   at the current listing key, included), then call refreshGapCache() again.
-     *
-     * @param {GapCacheInterface} gapCacheProxy - API proxy to the gaps cache
-     *   (the proxy should handle prefixing object keys with the bucket name)
-     * @param {number} [minGapWeight=100] - minimum weight of a gap for it to be
-     *   added in the cache
-     * @param {number} [triggerSaveGapWeight] - cumulative weight to wait for
-     *   before saving the current building gap. Cannot be greater than
-     *   `gapCacheProxy.maxGapWeight` (the value is thresholded to `maxGapWeight`
-     *   otherwise). Defaults to `gapCacheProxy.maxGapWeight / 2`.
-     * @return {undefined}
-     */
-    refreshGapCache(
-        gapCacheProxy: GapCacheInterface,
-        minGapWeight?: number,
-        triggerSaveGapWeight?: number
-    ): void {
-        if (this.vFormat !== BucketVersioningKeyFormat.v0) {
-            return;
-        }
-        if (this._gapCaching.state === GapCachingState.NoGapCache) {
-            this._gapCaching = {
-                state: GapCachingState.UnknownGap,
-                gapCache: gapCacheProxy,
-            };
-        }
-        const refreshedBuildingParams: GapBuildingParams = {
-            minGapWeight: minGapWeight || 100,
-            triggerSaveGapWeight: triggerSaveGapWeight
-                || Math.trunc(gapCacheProxy.maxGapWeight / 2),
-            initTimestamp: Date.now(),
-        };
-        if (this._gapBuilding.state === GapBuildingState.Building) {
-            // refreshed params will be applied as soon as the current building gap is saved
-            this._refreshedBuildingParams = refreshedBuildingParams;
-        } else {
-            this._gapBuilding = {
-                state: GapBuildingState.NotBuilding,
-                gapCache: gapCacheProxy,
-                params: refreshedBuildingParams,
-            };
-        }
-    }
-
-    /**
-     * Trigger a lookup of the closest upcoming or already skippable gap.
-     *
-     * @param {string} fromKey - lookup a gap not before 'fromKey'
-     * @return {undefined} - the lookup is asynchronous and its
-     * response is handled inside this function
-     */
-    _triggerGapLookup(gapCaching: GapCachingInfo_NoCachedGap, fromKey: string): void {
-        this._gapCaching = {
-            state: GapCachingState.GapLookupInProgress,
-            gapCache: gapCaching.gapCache,
-        };
-        const maxKey = this.prefix ? inc(this.prefix) : undefined;
-        gapCaching.gapCache.lookupGap(fromKey, maxKey).then(_gap => {
-            const gap = <GapSetEntry | null> _gap;
-            if (gap) {
-                this._gapCaching = {
-                    state: GapCachingState.GapCached,
-                    gapCache: gapCaching.gapCache,
-                    gapCached: gap,
-                };
-            } else {
-                this._gapCaching = {
-                    state: GapCachingState.NoMoreGap,
-                };
-            }
-        });
-    }
-
-    _checkGapOnMasterDeleteMarker(key: string): FilterReturnValue {
-        switch (this._gapBuilding.state) {
-        case GapBuildingState.Disabled:
-        case GapBuildingState.Expired:
-            break;
-        case GapBuildingState.NotBuilding:
-            this._createBuildingGap(key, 1);
-            break;
-        case GapBuildingState.Building:
-            this._updateBuildingGap(key);
-            break;
-        }
-        if (this._gapCaching.state === GapCachingState.GapCached) {
-            const { gapCached } = this._gapCaching;
-            if (key >= gapCached.firstKey) {
-                if (key <= gapCached.lastKey) {
-                    // we are inside the last looked up cached gap: transition to
-                    // 'SkippingGapV0' state
-                    this.setState(<DelimiterMasterFilterState_SkippingGapV0> {
-                        id: DelimiterMasterFilterStateId.SkippingGapV0,
-                    });
-                    // cut the current gap before skipping, it will be merged or
-                    // chained with the existing one (depending on its weight)
-                    if (this._gapBuilding.state === GapBuildingState.Building) {
-                        // substract 1 from the weight because we are going to chain this gap,
-                        // which has an overlap of one key.
-                        this._gapBuilding.gap.weight -= 1;
-                        this._cutBuildingGap();
-                    }
-                    return FILTER_SKIP;
-                }
-                // as we are past the cached gap, we will need another lookup
-                this._gapCaching = {
-                    state: GapCachingState.UnknownGap,
-                    gapCache: this._gapCaching.gapCache,
-                };
-            }
-        }
-        if (this._gapCaching.state === GapCachingState.UnknownGap) {
-            this._triggerGapLookup(this._gapCaching, key);
-        }
-        return FILTER_ACCEPT;
-    }
-
-    filter_onNewMasterKeyV0(key: string, value: string): FilterReturnValue {
-        // if this master key is a delete marker, accept it without
-        // adding the version to the contents
-        if (Version.isDeleteMarker(value)) {
-            // update the state to start skipping versions of the new master key
-            this.setState(<DelimiterMasterFilterState_SkippingVersionsV0> {
-                id: DelimiterMasterFilterStateId.SkippingVersionsV0,
-                masterKey: key,
-            });
-            return this._checkGapOnMasterDeleteMarker(key);
-        }
-        if (Version.isPHD(value)) {
-            // master version is a PHD version: wait for the first
-            // following version that will be considered as the actual
-            // master key
-            this.setState(<DelimiterMasterFilterState_WaitVersionAfterPHDV0> {
-                id: DelimiterMasterFilterStateId.WaitVersionAfterPHDV0,
-                masterKey: key,
-            });
-            return FILTER_ACCEPT;
-        }
-        // cut the current gap as soon as a non-deleted entry is seen
-        this._cutBuildingGap();
-
-        if (key.startsWith(DbPrefixes.Replay)) {
-            // skip internal replay prefix entirely
-            this.setState(<DelimiterFilterState_SkippingPrefix> {
-                id: DelimiterFilterStateId.SkippingPrefix,
-                prefix: DbPrefixes.Replay,
-            });
-            return FILTER_SKIP;
-        }
-        if (this._reachedMaxKeys()) {
-            return FILTER_END;
-        }
-
-        const commonPrefix = this.addCommonPrefixOrContents(key, value);
-        if (commonPrefix) {
-            // transition into SkippingPrefix state to skip all following keys
-            // while they start with the same prefix
-            this.setState(<DelimiterFilterState_SkippingPrefix> {
-                id: DelimiterFilterStateId.SkippingPrefix,
-                prefix: commonPrefix,
-            });
-            return FILTER_ACCEPT;
-        }
-        // update the state to start skipping versions of the new master key
-        this.setState(<DelimiterMasterFilterState_SkippingVersionsV0> {
-            id: DelimiterMasterFilterStateId.SkippingVersionsV0,
-            masterKey: key,
-        });
-        return FILTER_ACCEPT;
-    }
-
-    keyHandler_NotSkippingPrefixNorVersionsV0(key: string, value: string): FilterReturnValue {
-        return this.filter_onNewMasterKeyV0(key, value);
-    }
-
-    filter_onNewMasterKeyV1(key: string, value: string): FilterReturnValue {
-        // if this master key is a delete marker, accept it without
-        // adding the version to the contents
-        if (Version.isDeleteMarker(value)) {
-            return FILTER_ACCEPT;
-        }
-        // use base Delimiter's implementation
-        return this.keyHandler_NotSkipping_Delimiter(key, value);
-    }
-
-    keyHandler_NotSkippingPrefixNorVersionsV1(key: string, value: string): FilterReturnValue {
-        return this.filter_onNewMasterKeyV1(key, value);
-    }
-
-    keyHandler_SkippingVersionsV0(key: string, value: string): FilterReturnValue {
-        /* In the SkippingVersionsV0 state, skip all version keys
-         * (<key><versionIdSeparator><version>) */
-        const versionIdIndex = key.indexOf(VID_SEP);
-        if (versionIdIndex !== -1) {
-            // version keys count in the building gap weight because they must
-            // also be listed until skipped
-            if (this._gapBuilding.state === GapBuildingState.Building) {
-                this._updateBuildingGap(key);
-            }
-            return FILTER_SKIP;
-        }
-        return this.filter_onNewMasterKeyV0(key, value);
-    }
-
-    keyHandler_WaitVersionAfterPHDV0(key: string, value: string): FilterReturnValue {
-        // After a PHD key is encountered, the next version key of the
-        // same object if it exists is the new master key, hence
-        // consider it as such and call 'onNewMasterKeyV0' (the test
-        // 'masterKey == phdKey' is probably redundant when we already
-        // know we have a versioned key, since all objects in v0 have
-        // a master key, but keeping it in doubt)
-        const { masterKey: phdKey } = <DelimiterMasterFilterState_WaitVersionAfterPHDV0> this.state;
-        const versionIdIndex = key.indexOf(VID_SEP);
-        if (versionIdIndex !== -1) {
-            const masterKey = key.slice(0, versionIdIndex);
-            if (masterKey === phdKey) {
-                return this.filter_onNewMasterKeyV0(masterKey, value);
-            }
-        }
-        return this.filter_onNewMasterKeyV0(key, value);
-    }
-
-    keyHandler_SkippingGapV0(key: string, value: string): FilterReturnValue {
-        const { gapCache, gapCached } = <GapCachingInfo_GapCached> this._gapCaching;
-        if (key <= gapCached.lastKey) {
-            return FILTER_SKIP;
-        }
-        this._gapCaching = {
-            state: GapCachingState.UnknownGap,
-            gapCache,
-        };
-        this.setState(<DelimiterMasterFilterState_SkippingVersionsV0> {
-            id: DelimiterMasterFilterStateId.SkippingVersionsV0,
-        });
-        // Start a gap with weight=0 from the latest skippable key. This will
-        // allow to extend the gap just skipped with a chained gap in case
-        // other delete markers are seen after the existing gap is skipped.
-        this._createBuildingGap(gapCached.lastKey, 0, gapCached.weight);
-
-        return this.handleKey(key, value);
-    }
-
-    skippingBase(): string | undefined {
-        switch (this.state.id) {
-        case DelimiterMasterFilterStateId.SkippingVersionsV0:
-            const { masterKey } = <DelimiterMasterFilterState_SkippingVersionsV0> this.state;
-            return masterKey + inc(VID_SEP);
-
-        case DelimiterMasterFilterStateId.SkippingGapV0:
-            const { gapCached } = <GapCachingInfo_GapCached> this._gapCaching;
-            return gapCached.lastKey;
-
-        default:
-            return super.skippingBase();
-        }
-    }
-
-    result(): ResultObject {
-        this._cutBuildingGap();
-        return super.result();
-    }
-
-    _checkRefreshedBuildingParams(params: GapBuildingParams): GapBuildingParams {
-        if (this._refreshedBuildingParams) {
-            const newParams = this._refreshedBuildingParams;
-            this._refreshedBuildingParams = null;
-            return newParams;
-        }
-        return params;
-    }
-
-    /**
-     * Save the gap being built if allowed (i.e. still within the
-     * allocated exposure time window).
-     *
-     * @return {boolean} - true if the gap was saved, false if we are
-     * outside the allocated exposure time window.
-     */
-    _saveBuildingGap(): boolean {
-        const { gapCache, params, gap, gapWeight } =
-              <GapBuildingInfo_Building> this._gapBuilding;
-        const totalElapsed = Date.now() - params.initTimestamp;
-        if (totalElapsed >= gapCache.exposureDelayMs) {
-            this._gapBuilding = {
-                state: GapBuildingState.Expired,
-            };
-            this._refreshedBuildingParams = null;
-            return false;
-        }
-        const { firstKey, lastKey, weight } = gap;
-        gapCache.setGap(firstKey, lastKey, weight);
-        this._gapBuilding = {
-            state: GapBuildingState.Building,
-            gapCache,
-            params: this._checkRefreshedBuildingParams(params),
-            gap: {
-                firstKey: gap.lastKey,
-                lastKey: gap.lastKey,
-                weight: 0,
-            },
-            gapWeight,
-        };
-        return true;
-    }
-
-    /**
-     * Create a new gap to be extended afterwards
-     *
-     * @param {string} newKey - gap's first key
-     * @param {number} startWeight - initial weight of the building gap (usually 0 or 1)
-     * @param {number} [cachedWeight] - if continuing a cached gap, weight of the existing
-     *   cached portion
-     * @return {undefined}
-     */
-    _createBuildingGap(newKey: string, startWeight: number, cachedWeight?: number): void {
-        if (this._gapBuilding.state === GapBuildingState.NotBuilding) {
-            const { gapCache, params } = <GapBuildingInfo_NotBuilding> this._gapBuilding;
-            this._gapBuilding = {
-                state: GapBuildingState.Building,
-                gapCache,
-                params: this._checkRefreshedBuildingParams(params),
-                gap: {
-                    firstKey: newKey,
-                    lastKey: newKey,
-                    weight: startWeight,
-                },
-                gapWeight: (cachedWeight || 0) + startWeight,
-            };
-        }
-    }
-
-    _updateBuildingGap(newKey: string): void {
-        const gapBuilding = <GapBuildingInfo_Building> this._gapBuilding;
-        const { params, gap } = gapBuilding;
-        gap.lastKey = newKey;
-        gap.weight += 1;
-        gapBuilding.gapWeight += 1;
-        // the GapCache API requires updating a gap regularly because it can only split
-        // it once per update, by the known last key. In practice the default behavior
-        // is to trigger an update after a number of keys that is half the maximum weight.
-        // It is also useful for other listings to benefit from the cache sooner.
-        if (gapBuilding.gapWeight >= params.minGapWeight &&
-            gap.weight >= params.triggerSaveGapWeight) {
-            this._saveBuildingGap();
-        }
-    }
-
-    _cutBuildingGap(): void {
-        if (this._gapBuilding.state === GapBuildingState.Building) {
-            let gapBuilding = <GapBuildingInfo_Building> this._gapBuilding;
-            let { gapCache, params, gap, gapWeight } = gapBuilding;
-            // only set gaps that are significant enough in weight and
-            // with a non-empty extension
-            if (gapWeight >= params.minGapWeight && gap.weight > 0) {
-                // we're done if we were not allowed to save the gap
-                if (!this._saveBuildingGap()) {
-                    return;
-                }
-                // params may have been refreshed, reload them
-                gapBuilding = <GapBuildingInfo_Building> this._gapBuilding;
-                params = gapBuilding.params;
-            }
-            this._gapBuilding = {
-                state: GapBuildingState.NotBuilding,
-                gapCache,
-                params,
-            };
-        }
-    }
-}
--- a/lib/algos/list/delimiterNonCurrent.js
+++ b/lib/algos/list/delimiterNonCurrent.js
@ -1,202 +0,0 @@
-const { DelimiterVersions } = require('./delimiterVersions');
-const { FILTER_END, FILTER_SKIP } = require('./tools');
-
-const TRIM_METADATA_MIN_BLOB_SIZE = 10000;
-
-/**
- * Handle object listing with parameters. This extends the base class DelimiterVersions
- * to return the raw non-current versions objects.
- */
-class DelimiterNonCurrent extends DelimiterVersions {
-    /**
-     * Delimiter listing of non-current versions.
-     * @param {Object}  parameters                  - listing parameters
-     * @param {String}  parameters.keyMarker        - key marker
-     * @param {String}  parameters.versionIdMarker  - version id marker
-     * @param {String}  parameters.beforeDate       - limit the response to keys with stale date older than beforeDate.
-     * “stale date” is the date on when a version becomes non-current.
-     * @param {Number} parameters.maxScannedLifecycleListingEntries - max number of entries to be scanned
-     * @param {String} parameters.excludedDataStoreName - exclude dataStoreName matches from the versions
-     * @param {RequestLogger} logger                - The logger of the request
-     * @param {String} [vFormat]                    - versioning key format
-     */
-    constructor(parameters, logger, vFormat) {
-        super(parameters, logger, vFormat);
-
-        this.beforeDate = parameters.beforeDate;
-        this.excludedDataStoreName = parameters.excludedDataStoreName;
-        this.maxScannedLifecycleListingEntries = parameters.maxScannedLifecycleListingEntries;
-
-        // internal state
-        this.prevKey = null;
-        this.staleDate = null;
-
-        this.scannedKeys = 0;
-    }
-
-    getLastModified(value) {
-        let lastModified;
-        try {
-            const v = JSON.parse(value);
-            lastModified = v['last-modified'];
-        } catch (e) {
-            this.logger.warn('could not parse Object Metadata while listing',
-                {
-                    method: 'getLastModified',
-                    err: e.toString(),
-                });
-        }
-        return lastModified;
-    }
-
-    // Overwrite keyHandler_SkippingVersions to include the last version from the previous listing.
-    // The creation (last-modified) date of this version will be the stale date for the following version.
-    // eslint-disable-next-line camelcase
-    keyHandler_SkippingVersions(key, versionId, value) {
-        if (key === this.keyMarker) {
-            // since the nonversioned key equals the marker, there is
-            // necessarily a versionId in this key
-            const _versionId = versionId;
-            if (_versionId < this.versionIdMarker) {
-                // skip all versions until marker
-                return FILTER_SKIP;
-            }
-        }
-        this.setState({
-            id: 1 /* NotSkipping */,
-        });
-        return this.handleKey(key, versionId, value);
-    }
-
-    filter(obj) {
-        if (this.maxScannedLifecycleListingEntries && this.scannedKeys >= this.maxScannedLifecycleListingEntries) {
-            this.IsTruncated = true;
-            this.logger.info('listing stopped due to reaching the maximum scanned entries limit',
-                {
-                    maxScannedLifecycleListingEntries: this.maxScannedLifecycleListingEntries,
-                    scannedKeys: this.scannedKeys,
-                });
-            return FILTER_END;
-        }
-        ++this.scannedKeys;
-        return super.filter(obj);
-    }
-
-    /**
-     * NOTE: Each version of a specific key is sorted from the latest to the oldest
-     * thanks to the way version ids are generated.
-     * DESCRIPTION: Skip the version if it represents the master key, but keep its last-modified date in memory,
-     * which will be the stale date of the following version.
-     * The following version is pushed only:
-     * - if the "stale date" (picked up from the previous version) is available (JSON.parse has not failed),
-     * - if "beforeDate" is not specified or if specified and the "stale date" is older.
-     * - if "excludedDataStoreName" is not specified or if specified and the data store name is different
-     * The in-memory "stale date" is then updated with the version's last-modified date to be used for
-     * the following version.
-     * The process stops and returns the available results if either:
-     * - no more metadata key is left to be processed
-     * - the listing reaches the maximum number of key to be returned
-     * - the internal timeout is reached
-     *  @param {String} key   - The key to add
-     *  @param {String} versionId - The version id
-     *  @param {String} value - The value of the key
-     *  @return {undefined}
-     */
-    addVersion(key, versionId, value) {
-        this.nextKeyMarker = key;
-        this.nextVersionIdMarker = versionId;
-
-        // Skip the version if it represents the non-current version, but keep its last-modified date,
-        // which will be the stale date of the following version.
-        const isCurrentVersion = key !== this.prevKey;
-        if (isCurrentVersion) {
-            this.staleDate = this.getLastModified(value);
-            this.prevKey = key;
-            return;
-        }
-
-        // The following version is pushed only:
-        // - if the "stale date" (picked up from the previous version) is available (JSON.parse has not failed),
-        // - if "beforeDate" is not specified or if specified and the "stale date" is older.
-        // - if "excludedDataStoreName" is not specified or if specified and the data store name is different
-        let lastModified;
-        if (this.staleDate && (!this.beforeDate || this.staleDate < this.beforeDate)) {
-            const parsedValue = this._parse(value);
-            // if parsing fails, skip the key.
-            if (parsedValue) {
-                const dataStoreName = parsedValue.dataStoreName;
-                lastModified = parsedValue['last-modified'];
-                if (!this.excludedDataStoreName || dataStoreName !== this.excludedDataStoreName) {
-                    const s = this._stringify(parsedValue, this.staleDate);
-                    // check that _stringify succeeds to only push objects with a defined staleDate.
-                    if (s) {
-                        this.Versions.push({ key, value: s });
-                        ++this.keys;
-                    }
-                }
-            }
-        }
-
-        // The in-memory "stale date" is then updated with the version's last-modified date to be used for
-        // the following version.
-        this.staleDate = lastModified || this.getLastModified(value);
-
-        return;
-    }
-
-    /**
-     * Parses the stringified entry's value and remove the location property if too large.
-     * @param {string} s - sringified value
-     * @return {object} p - undefined if parsing fails, otherwise it contains the parsed value.
-     */
-    _parse(s) {
-        let p;
-        try {
-            p = JSON.parse(s);
-            if (s.length >= TRIM_METADATA_MIN_BLOB_SIZE) {
-                delete p.location;
-            }
-        } catch (e) {
-            this.logger.warn('Could not parse Object Metadata while listing', {
-                method: 'DelimiterNonCurrent._parse',
-                err: e.toString(),
-            });
-        }
-        return p;
-    }
-
-    _stringify(parsedMD, staleDate) {
-        const p = parsedMD;
-        let s = undefined;
-        p.staleDate = staleDate;
-        try {
-            s = JSON.stringify(p);
-        } catch (e) {
-            this.logger.warn('could not stringify Object Metadata while listing', {
-                method: 'DelimiterNonCurrent._stringify',
-                err: e.toString(),
-            });
-        }
-        return s;
-    }
-
-    result() {
-        const { Versions, IsTruncated, NextKeyMarker, NextVersionIdMarker } = super.result();
-
-        const result = {
-            Contents: Versions,
-            IsTruncated,
-        };
-
-        if (NextKeyMarker) {
-            result.NextKeyMarker = NextKeyMarker;
-        }
-
-        if (NextVersionIdMarker) {
-            result.NextVersionIdMarker = NextVersionIdMarker;
-        }
-
-        return result;
-    }
-}
-module.exports = { DelimiterNonCurrent };
--- a/lib/algos/list/delimiterOrphanDeleteMarker.js
+++ b/lib/algos/list/delimiterOrphanDeleteMarker.js
@ -1,204 +0,0 @@
-const DelimiterVersions = require('./delimiterVersions').DelimiterVersions;
-const { FILTER_END } = require('./tools');
-const TRIM_METADATA_MIN_BLOB_SIZE = 10000;
-/**
- * Handle object listing with parameters. This extends the base class DelimiterVersions
- * to return the orphan delete markers. Orphan delete markers are also
- * refered as expired object delete marker.
- * They are delete marker with zero noncurrent versions.
- */
-class DelimiterOrphanDeleteMarker extends DelimiterVersions {
-    /**
-     * Delimiter listing of orphan delete markers.
-     * @param {Object}  parameters            - listing parameters
-     * @param {String}  parameters.beforeDate - limit the response to keys older than beforeDate
-     * @param {Number} parameters.maxScannedLifecycleListingEntries - max number of entries to be scanned
-     * @param {RequestLogger} logger          - The logger of the request
-     * @param {String} [vFormat]              - versioning key format
-     */
-    constructor(parameters, logger, vFormat) {
-        const {
-            marker,
-            maxKeys,
-            prefix,
-            beforeDate,
-            maxScannedLifecycleListingEntries,
-        } = parameters;
-
-        const versionParams = {
-            // The orphan delete marker logic uses the term 'marker' instead of 'keyMarker',
-            // as the latter could suggest the presence of a 'versionIdMarker'.
-            keyMarker: marker,
-            maxKeys,
-            prefix,
-        };
-        super(versionParams, logger, vFormat);
-
-        this.maxScannedLifecycleListingEntries = maxScannedLifecycleListingEntries;
-        this.beforeDate = beforeDate;
-        // this.prevKeyName is used as a marker for the next listing when the current one reaches its entry limit.
-        // We cannot rely on this.keyName, as it contains the name of the current key.
-        // In the event of a listing interruption due to reaching the maximum scanned entries,
-        // relying on this.keyName would cause the next listing to skip the current key because S3 starts
-        // listing after the marker.
-        this.prevKeyName = null;
-        this.keyName = null;
-        this.value = null;
-        this.scannedKeys = 0;
-    }
-
-    _reachedMaxKeys() {
-        if (this.keys >= this.maxKeys) {
-            return true;
-        }
-        return false;
-    }
-
-    _addOrphan() {
-        const parsedValue = this._parse(this.value);
-        // if parsing fails, skip the key.
-        if (parsedValue) {
-            const lastModified = parsedValue['last-modified'];
-            const isDeleteMarker = parsedValue.isDeleteMarker;
-            // We then check if the orphan version is a delete marker and if it is older than the "beforeDate"
-            if ((!this.beforeDate || (lastModified && lastModified < this.beforeDate)) && isDeleteMarker) {
-                // Prefer returning an untrimmed data rather than stopping the service in case of parsing failure.
-                const s = this._stringify(parsedValue) || this.value;
-                this.Versions.push({ key: this.keyName, value: s });
-                this.nextKeyMarker = this.keyName;
-                ++this.keys;
-            }
-        }
-    }
-
-    /**
-     * Parses the stringified entry's value and remove the location property if too large.
-     * @param {string} s - sringified value
-     * @return {object} p - undefined if parsing fails, otherwise it contains the parsed value.
-     */
-    _parse(s) {
-        let p;
-        try {
-            p = JSON.parse(s);
-            if (s.length >= TRIM_METADATA_MIN_BLOB_SIZE) {
-                delete p.location;
-            }
-        } catch (e) {
-            this.logger.warn('Could not parse Object Metadata while listing', {
-                method: 'DelimiterOrphanDeleteMarker._parse',
-                err: e.toString(),
-            });
-        }
-        return p;
-    }
-
-    _stringify(value) {
-        const p = value;
-        let s = undefined;
-        try {
-            s = JSON.stringify(p);
-        } catch (e) {
-            this.logger.warn('could not stringify Object Metadata while listing',
-                {
-                    method: 'DelimiterOrphanDeleteMarker._stringify',
-                    err: e.toString(),
-                });
-        }
-        return s;
-    }
-    /**
-     * The purpose of _isMaxScannedEntriesReached is to restrict the number of scanned entries,
-     * thus controlling resource overhead (CPU...).
-     * @return {boolean} isMaxScannedEntriesReached - true if the maximum limit on the number
-     * of entries scanned has been reached, false otherwise.
-    */
-    _isMaxScannedEntriesReached() {
-        return this.maxScannedLifecycleListingEntries && this.scannedKeys >= this.maxScannedLifecycleListingEntries;
-    }
-
-    filter(obj) {
-        if (this._isMaxScannedEntriesReached()) {
-            this.nextKeyMarker = this.prevKeyName;
-            this.IsTruncated = true;
-            this.logger.info('listing stopped due to reaching the maximum scanned entries limit',
-                {
-                    maxScannedLifecycleListingEntries: this.maxScannedLifecycleListingEntries,
-                    scannedKeys: this.scannedKeys,
-                });
-            return FILTER_END;
-        }
-        ++this.scannedKeys;
-        return super.filter(obj);
-    }
-
-    /**
-     * NOTE: Each version of a specific key is sorted from the latest to the oldest
-     * thanks to the way version ids are generated.
-     * DESCRIPTION: For a given key, the latest version is kept in memory since it is the current version.
-     * If the following version reference a new key, it means that the previous one was an orphan version.
-     * We then check if the orphan version is a delete marker and if it is older than the "beforeDate"
-     * The process stops and returns the available results if either:
-     * - no more metadata key is left to be processed
-     * - the listing reaches the maximum number of key to be returned
-     * - the internal timeout is reached
-     * NOTE: we cannot leverage MongoDB to list keys older than "beforeDate"
-     * because then we will not be able to assess its orphanage.
-     *  @param {String} key   - The object key.
-     * @param {String} versionId   - The object version id.
-     *  @param {String} value - The value of the key
-     *  @return {undefined}
-     */
-    addVersion(key, versionId, value) {
-        // For a given key, the youngest version is kept in memory since it represents the current version.
-        if (key !== this.keyName) {
-            // If this.value is defined, it means that <this.keyName, this.value> pair is "allowed" to be an orphan.
-            if (this.value) {
-                this._addOrphan();
-            }
-            this.prevKeyName = this.keyName;
-            this.keyName = key;
-            this.value = value;
-
-            return;
-        }
-
-        // If the key is not the current version, we can skip it in the next listing
-        // in the case where the current listing is interrupted due to reaching the maximum scanned entries.
-        this.prevKeyName = key;
-        this.keyName = key;
-        this.value = null;
-
-        return;
-    }
-
-    result() {
-        // Only check for remaining last orphan delete marker if the listing is not interrupted.
-        // This will help avoid false positives.
-        if (!this._isMaxScannedEntriesReached()) {
-            // The following check makes sure the last orphan delete marker is not forgotten.
-            if (this.keys < this.maxKeys) {
-                if (this.value) {
-                    this._addOrphan();
-                }
-            // The following make sure that if makeKeys is reached, isTruncated is set to true.
-            // We moved the "isTruncated" from _reachedMaxKeys to make sure we take into account the last entity
-            // if listing is truncated right before the last entity and the last entity is a orphan delete marker.
-            } else {
-                this.IsTruncated = this.maxKeys > 0;
-            }
-        }
-
-        const result = {
-            Contents: this.Versions,
-            IsTruncated: this.IsTruncated,
-        };
-
-        if (this.IsTruncated) {
-            result.NextMarker = this.nextKeyMarker;
-        }
-
-        return result;
-    }
-}
-
-module.exports = { DelimiterOrphanDeleteMarker };
--- a/lib/algos/list/delimiterVersions.js
+++ b/lib/algos/list/delimiterVersions.js
@ -0,0 +1,283 @@
+'use strict'; // eslint-disable-line strict
+
+const Delimiter = require('./delimiter').Delimiter;
+const Version = require('../../versioning/Version').Version;
+const VSConst = require('../../versioning/constants').VersioningConstants;
+const { inc, FILTER_END, FILTER_ACCEPT, FILTER_SKIP, SKIP_NONE } =
+    require('./tools');
+
+const VID_SEP = VSConst.VersionId.Separator;
+const { DbPrefixes, BucketVersioningKeyFormat } = VSConst;
+
+/**
+ * Handle object listing with parameters
+ *
+ * @prop {String[]} CommonPrefixes     - 'folders' defined by the delimiter
+ * @prop {String[]} Contents           - 'files' to list
+ * @prop {Boolean} IsTruncated         - truncated listing flag
+ * @prop {String|undefined} NextMarker - marker per amazon format
+ * @prop {Number} keys                 - count of listed keys
+ * @prop {String|undefined} delimiter  - separator per amazon format
+ * @prop {String|undefined} prefix     - prefix per amazon format
+ * @prop {Number} maxKeys              - number of keys to list
+ */
+class DelimiterVersions extends Delimiter {
+    constructor(parameters, logger, vFormat) {
+        super(parameters, logger, vFormat);
+        // specific to version listing
+        this.keyMarker = parameters.keyMarker;
+        this.versionIdMarker = parameters.versionIdMarker;
+        // internal state
+        this.masterKey = undefined;
+        this.masterVersionId = undefined;
+        // listing results
+        this.NextMarker = parameters.keyMarker;
+        this.NextVersionIdMarker = undefined;
+        this.inReplayPrefix = false;
+
+        Object.assign(this, {
+            [BucketVersioningKeyFormat.v0]: {
+                genMDParams: this.genMDParamsV0,
+                filter: this.filterV0,
+                skipping: this.skippingV0,
+            },
+            [BucketVersioningKeyFormat.v1]: {
+                genMDParams: this.genMDParamsV1,
+                filter: this.filterV1,
+                skipping: this.skippingV1,
+            },
+        }[this.vFormat]);
+    }
+
+    genMDParamsV0() {
+        const params = {};
+        if (this.parameters.prefix) {
+            params.gte = this.parameters.prefix;
+            params.lt = inc(this.parameters.prefix);
+        }
+        if (this.parameters.keyMarker) {
+            if (params.gte && params.gte > this.parameters.keyMarker) {
+                return params;
+            }
+            delete params.gte;
+            if (this.parameters.versionIdMarker) {
+                // versionIdMarker should always come with keyMarker
+                // but may not be the other way around
+                params.gt = this.parameters.keyMarker
+                    + VID_SEP
+                    + this.parameters.versionIdMarker;
+            } else {
+                params.gt = inc(this.parameters.keyMarker + VID_SEP);
+            }
+        }
+        return params;
+    }
+
+    genMDParamsV1() {
+        // return an array of two listing params sets to ask for
+        // synchronized listing of M and V ranges
+        const params = [{}, {}];
+        if (this.parameters.prefix) {
+            params[0].gte = DbPrefixes.Master + this.parameters.prefix;
+            params[0].lt = DbPrefixes.Master + inc(this.parameters.prefix);
+            params[1].gte = DbPrefixes.Version + this.parameters.prefix;
+            params[1].lt = DbPrefixes.Version + inc(this.parameters.prefix);
+        } else {
+            params[0].gte = DbPrefixes.Master;
+            params[0].lt = inc(DbPrefixes.Master); // stop after the last master key
+            params[1].gte = DbPrefixes.Version;
+            params[1].lt = inc(DbPrefixes.Version); // stop after the last version key
+        }
+        if (this.parameters.keyMarker) {
+            if (params[1].gte <= DbPrefixes.Version + this.parameters.keyMarker) {
+                delete params[0].gte;
+                delete params[1].gte;
+                params[0].gt = DbPrefixes.Master + inc(this.parameters.keyMarker + VID_SEP);
+                if (this.parameters.versionIdMarker) {
+                    // versionIdMarker should always come with keyMarker
+                    // but may not be the other way around
+                    params[1].gt = DbPrefixes.Version
+                        + this.parameters.keyMarker
+                        + VID_SEP
+                        + this.parameters.versionIdMarker;
+                } else {
+                    params[1].gt = DbPrefixes.Version
+                        + inc(this.parameters.keyMarker + VID_SEP);
+                }
+            }
+        }
+        return params;
+    }
+
+    /**
+     * Used to synchronize listing of M and V prefixes by object key
+     *
+     * @param {object} masterObj object listed from first range
+     * returned by genMDParamsV1() (the master keys range)
+     * @param {object} versionObj object listed from second range
+     * returned by genMDParamsV1() (the version keys range)
+     * @return {number} comparison result:
+     *   * -1 if master key < version key
+     *   * 1 if master key > version key
+     */
+    compareObjects(masterObj, versionObj) {
+        const masterKey = masterObj.key.slice(DbPrefixes.Master.length);
+        const versionKey = versionObj.key.slice(DbPrefixes.Version.length);
+        return masterKey < versionKey ? -1 : 1;
+    }
+
+    /**
+     *  Add a (key, versionId, value) tuple to the listing.
+     *  Set the NextMarker to the current key
+     *  Increment the keys counter
+     *  @param {object} obj             - the entry to add to the listing result
+     *  @param {String} obj.key         - The key to add
+     *  @param {String} obj.versionId   - versionId
+     *  @param {String} obj.value       - The value of the key
+     *  @return {Boolean} - indicates if iteration should continue
+     */
+    addContents(obj) {
+        if (this._reachedMaxKeys()) {
+            return FILTER_END;
+        }
+        this.Contents.push({
+            key: obj.key,
+            value: this.trimMetadata(obj.value),
+            versionId: obj.versionId,
+        });
+        this.NextMarker = obj.key;
+        this.NextVersionIdMarker = obj.versionId;
+        ++this.keys;
+        return FILTER_ACCEPT;
+    }
+
+    /**
+     *  Filter to apply on each iteration if bucket is in v0
+     *  versioning key format, based on:
+     *  - prefix
+     *  - delimiter
+     *  - maxKeys
+     *  The marker is being handled directly by levelDB
+     *  @param {Object} obj       - The key and value of the element
+     *  @param {String} obj.key   - The key of the element
+     *  @param {String} obj.value - The value of the element
+     *  @return {number}          - indicates if iteration should continue
+     */
+    filterV0(obj) {
+        if (obj.key.startsWith(DbPrefixes.Replay)) {
+            this.inReplayPrefix = true;
+            return FILTER_SKIP;
+        }
+        this.inReplayPrefix = false;
+
+        if (Version.isPHD(obj.value)) {
+            // return accept to avoid skipping the next values in range
+            return FILTER_ACCEPT;
+        }
+        return this.filterCommon(obj.key, obj.value);
+    }
+
+    /**
+     *  Filter to apply on each iteration if bucket is in v1
+     *  versioning key format, based on:
+     *  - prefix
+     *  - delimiter
+     *  - maxKeys
+     *  The marker is being handled directly by levelDB
+     *  @param {Object} obj       - The key and value of the element
+     *  @param {String} obj.key   - The key of the element
+     *  @param {String} obj.value - The value of the element
+     *  @return {number}          - indicates if iteration should continue
+     */
+    filterV1(obj) {
+        if (Version.isPHD(obj.value)) {
+            // return accept to avoid skipping the next values in range
+            return FILTER_ACCEPT;
+        }
+        // this function receives both M and V keys, but their prefix
+        // length is the same so we can remove their prefix without
+        // looking at the type of key
+        return this.filterCommon(obj.key.slice(DbPrefixes.Master.length),
+            obj.value);
+    }
+
+    filterCommon(key, value) {
+        if (this.prefix && !key.startsWith(this.prefix)) {
+            return FILTER_SKIP;
+        }
+        let nonversionedKey;
+        let versionId = undefined;
+        const versionIdIndex = key.indexOf(VID_SEP);
+        if (versionIdIndex < 0) {
+            nonversionedKey = key;
+            this.masterKey = key;
+            this.masterVersionId =
+                Version.from(value).getVersionId() || 'null';
+            versionId = this.masterVersionId;
+        } else {
+            nonversionedKey = key.slice(0, versionIdIndex);
+            versionId = key.slice(versionIdIndex + 1);
+            // skip a version key if it is the master version
+            if (this.masterKey === nonversionedKey && this.masterVersionId === versionId) {
+                return FILTER_SKIP;
+            }
+            this.masterKey = undefined;
+            this.masterVersionId = undefined;
+        }
+        if (this.delimiter) {
+            const baseIndex = this.prefix ? this.prefix.length : 0;
+            const delimiterIndex = nonversionedKey.indexOf(this.delimiter, baseIndex);
+            if (delimiterIndex >= 0) {
+                return this.addCommonPrefix(nonversionedKey, delimiterIndex);
+            }
+        }
+        return this.addContents({ key: nonversionedKey, value, versionId });
+    }
+
+    skippingV0() {
+        if (this.inReplayPrefix) {
+            return DbPrefixes.Replay;
+        }
+        if (this.NextMarker) {
+            const index = this.NextMarker.lastIndexOf(this.delimiter);
+            if (index === this.NextMarker.length - 1) {
+                return this.NextMarker;
+            }
+        }
+        return SKIP_NONE;
+    }
+
+    skippingV1() {
+        const skipV0 = this.skippingV0();
+        if (skipV0 === SKIP_NONE) {
+            return SKIP_NONE;
+        }
+        // skip to the same object key in both M and V range listings
+        return [DbPrefixes.Master + skipV0,
+            DbPrefixes.Version + skipV0];
+    }
+
+    /**
+     *  Return an object containing all mandatory fields to use once the
+     *  iteration is done, doesn't show a NextMarker field if the output
+     *  isn't truncated
+     *  @return {Object} - following amazon format
+     */
+    result() {
+        /* NextMarker is only provided when delimiter is used.
+         * specified in v1 listing documentation
+         * http://docs.aws.amazon.com/AmazonS3/latest/API/RESTBucketGET.html
+         */
+        return {
+            CommonPrefixes: this.CommonPrefixes,
+            Versions: this.Contents,
+            IsTruncated: this.IsTruncated,
+            NextKeyMarker: this.IsTruncated ? this.NextMarker : undefined,
+            NextVersionIdMarker: this.IsTruncated ?
+                this.NextVersionIdMarker : undefined,
+            Delimiter: this.delimiter,
+        };
+    }
+}
+
+module.exports = { DelimiterVersions };
--- a/lib/algos/list/delimiterVersions.ts
+++ b/lib/algos/list/delimiterVersions.ts
@ -1,535 +0,0 @@
-'use strict'; // eslint-disable-line strict
-
-const Extension = require('./Extension').default;
-
-import {
-    FilterState,
-    FilterReturnValue,
-} from './delimiter';
-
-const Version = require('../../versioning/Version').Version;
-const VSConst = require('../../versioning/constants').VersioningConstants;
-const { inc, FILTER_END, FILTER_ACCEPT, FILTER_SKIP, SKIP_NONE } =
-    require('./tools');
-
-const VID_SEP = VSConst.VersionId.Separator;
-const { DbPrefixes, BucketVersioningKeyFormat } = VSConst;
-
-export const enum DelimiterVersionsFilterStateId {
-    NotSkipping = 1,
-    SkippingPrefix = 2,
-    SkippingVersions = 3,
-};
-
-export interface DelimiterVersionsFilterState_NotSkipping extends FilterState {
-    id: DelimiterVersionsFilterStateId.NotSkipping,
-};
-
-export interface DelimiterVersionsFilterState_SkippingPrefix extends FilterState {
-    id: DelimiterVersionsFilterStateId.SkippingPrefix,
-    prefix: string;
-};
-
-export interface DelimiterVersionsFilterState_SkippingVersions extends FilterState {
-    id: DelimiterVersionsFilterStateId.SkippingVersions,
-    gt: string;
-};
-
-type KeyHandler = (key: string, versionId: string | undefined, value: string) => FilterReturnValue;
-
-type ResultObject = {
-    CommonPrefixes: string[],
-    Versions: {
-        key: string;
-        value: string;
-        versionId: string;
-    }[];
-    IsTruncated: boolean;
-    Delimiter ?: string;
-    NextKeyMarker ?: string;
-    NextVersionIdMarker ?: string;
-};
-
-type GenMDParamsItem = {
-    gt ?: string,
-    gte ?: string,
-    lt ?: string,
-};
-
-/**
- * Handle object listing with parameters
- *
- * @prop {String[]} CommonPrefixes     - 'folders' defined by the delimiter
- * @prop {String[]} Contents           - 'files' to list
- * @prop {Boolean} IsTruncated         - truncated listing flag
- * @prop {String|undefined} NextMarker - marker per amazon format
- * @prop {Number} keys                 - count of listed keys
- * @prop {String|undefined} delimiter  - separator per amazon format
- * @prop {String|undefined} prefix     - prefix per amazon format
- * @prop {Number} maxKeys              - number of keys to list
- */
-export class DelimiterVersions extends Extension {
-
-    state: FilterState;
-    keyHandlers: { [id: number]: KeyHandler };
-
-    constructor(parameters, logger, vFormat) {
-        super(parameters, logger);
-        // original listing parameters
-        this.delimiter = parameters.delimiter;
-        this.prefix = parameters.prefix;
-        this.maxKeys = parameters.maxKeys || 1000;
-        // specific to version listing
-        this.keyMarker = parameters.keyMarker;
-        this.versionIdMarker = parameters.versionIdMarker;
-        // internal state
-        this.masterKey = undefined;
-        this.masterVersionId = undefined;
-        this.nullKey = null;
-        this.vFormat = vFormat || BucketVersioningKeyFormat.v0;
-        // listing results
-        this.CommonPrefixes = [];
-        this.Versions = [];
-        this.IsTruncated = false;
-        this.nextKeyMarker = parameters.keyMarker;
-        this.nextVersionIdMarker = undefined;
-
-        this.keyHandlers = {};
-
-        Object.assign(this, {
-            [BucketVersioningKeyFormat.v0]: {
-                genMDParams: this.genMDParamsV0,
-                getObjectKey: this.getObjectKeyV0,
-                skipping: this.skippingV0,
-            },
-            [BucketVersioningKeyFormat.v1]: {
-                genMDParams: this.genMDParamsV1,
-                getObjectKey: this.getObjectKeyV1,
-                skipping: this.skippingV1,
-            },
-        }[this.vFormat]);
-
-        if (this.vFormat === BucketVersioningKeyFormat.v0) {
-            this.setKeyHandler(
-                DelimiterVersionsFilterStateId.NotSkipping,
-                this.keyHandler_NotSkippingV0.bind(this));
-        } else {
-            this.setKeyHandler(
-                DelimiterVersionsFilterStateId.NotSkipping,
-                this.keyHandler_NotSkippingV1.bind(this));
-        }
-        this.setKeyHandler(
-            DelimiterVersionsFilterStateId.SkippingPrefix,
-            this.keyHandler_SkippingPrefix.bind(this));
-
-        this.setKeyHandler(
-            DelimiterVersionsFilterStateId.SkippingVersions,
-            this.keyHandler_SkippingVersions.bind(this));
-
-        if (this.versionIdMarker) {
-            this.state = <DelimiterVersionsFilterState_SkippingVersions> {
-                id: DelimiterVersionsFilterStateId.SkippingVersions,
-                gt: `${this.keyMarker}${VID_SEP}${this.versionIdMarker}`,
-            };
-        } else {
-            this.state = <DelimiterVersionsFilterState_NotSkipping> {
-                id: DelimiterVersionsFilterStateId.NotSkipping,
-            };
-        }
-    }
-
-    genMDParamsV0() {
-        const params: GenMDParamsItem = {};
-        if (this.prefix) {
-            params.gte = this.prefix;
-            params.lt = inc(this.prefix);
-        }
-        if (this.keyMarker && this.delimiter) {
-            const commonPrefix = this.getCommonPrefix(this.keyMarker);
-            if (commonPrefix) {
-                const afterPrefix = inc(commonPrefix);
-                if (!params.gte || afterPrefix > params.gte) {
-                    params.gte = afterPrefix;
-                }
-            }
-        }
-        if (this.keyMarker && (!params.gte || this.keyMarker >= params.gte)) {
-            delete params.gte;
-            if (this.versionIdMarker) {
-                // start from the beginning of versions so we can
-                // check if there's a null key and fetch it
-                // (afterwards, we can skip the rest of versions until
-                // we reach versionIdMarker)
-                params.gte = `${this.keyMarker}${VID_SEP}`;
-            } else {
-                params.gt = `${this.keyMarker}${inc(VID_SEP)}`;
-            }
-        }
-        return params;
-    }
-
-    genMDParamsV1() {
-        // return an array of two listing params sets to ask for
-        // synchronized listing of M and V ranges
-        const v0Params: GenMDParamsItem = this.genMDParamsV0();
-        const mParams: GenMDParamsItem = {};
-        const vParams: GenMDParamsItem = {};
-        if (v0Params.gt) {
-            mParams.gt = `${DbPrefixes.Master}${v0Params.gt}`;
-            vParams.gt = `${DbPrefixes.Version}${v0Params.gt}`;
-        } else if (v0Params.gte) {
-            mParams.gte = `${DbPrefixes.Master}${v0Params.gte}`;
-            vParams.gte = `${DbPrefixes.Version}${v0Params.gte}`;
-        } else {
-            mParams.gte = DbPrefixes.Master;
-            vParams.gte = DbPrefixes.Version;
-        }
-        if (v0Params.lt) {
-            mParams.lt = `${DbPrefixes.Master}${v0Params.lt}`;
-            vParams.lt = `${DbPrefixes.Version}${v0Params.lt}`;
-        } else {
-            mParams.lt = inc(DbPrefixes.Master);
-            vParams.lt = inc(DbPrefixes.Version);
-        }
-        return [mParams, vParams];
-    }
-
-    /**
-     * check if the max keys count has been reached and set the
-     * final state of the result if it is the case
-     * @return {Boolean} - indicates if the iteration has to stop
-     */
-    _reachedMaxKeys(): boolean {
-        if (this.keys >= this.maxKeys) {
-            // In cases of maxKeys <= 0 -> IsTruncated = false
-            this.IsTruncated = this.maxKeys > 0;
-            return true;
-        }
-        return false;
-    }
-
-    /**
-     * Used to synchronize listing of M and V prefixes by object key
-     *
-     * @param {object} masterObj object listed from first range
-     * returned by genMDParamsV1() (the master keys range)
-     * @param {object} versionObj object listed from second range
-     * returned by genMDParamsV1() (the version keys range)
-     * @return {number} comparison result:
-     *   * -1 if master key < version key
-     *   * 1 if master key > version key
-     */
-    compareObjects(masterObj, versionObj) {
-        const masterKey = masterObj.key.slice(DbPrefixes.Master.length);
-        const versionKey = versionObj.key.slice(DbPrefixes.Version.length);
-        return masterKey < versionKey ? -1 : 1;
-    }
-
-    /**
-     * Parse a listing key into its nonversioned key and version ID components
-     *
-     * @param {string} key - full listing key
-     * @return {object} obj
-     * @return {string} obj.key - nonversioned part of key
-     * @return {string} [obj.versionId] - version ID in the key
-     */
-    parseKey(fullKey: string): { key: string, versionId ?: string } {
-        const versionIdIndex = fullKey.indexOf(VID_SEP);
-        if (versionIdIndex === -1) {
-            return { key: fullKey };
-        }
-        const nonversionedKey: string = fullKey.slice(0, versionIdIndex);
-        let versionId: string = fullKey.slice(versionIdIndex + 1);
-        return { key: nonversionedKey, versionId };
-    }
-
-    /**
-     * Include a key in the listing output, in the Versions or CommonPrefix result
-     *
-     * @param {string} key - key (without version ID)
-     * @param {string} versionId - version ID
-     * @param {string} value - metadata value
-     * @return {undefined}
-     */
-    addKey(key: string, versionId: string, value: string) {
-        // add the subprefix to the common prefixes if the key has the delimiter
-        const commonPrefix = this.getCommonPrefix(key);
-        if (commonPrefix) {
-            this.addCommonPrefix(commonPrefix);
-            // transition into SkippingPrefix state to skip all following keys
-            // while they start with the same prefix
-            this.setState(<DelimiterVersionsFilterState_SkippingPrefix> {
-                id: DelimiterVersionsFilterStateId.SkippingPrefix,
-                prefix: commonPrefix,
-            });
-        } else {
-            this.addVersion(key, versionId, value);
-        }
-    }
-
-    /**
-     *  Add a (key, versionId, value) tuple to the listing.
-     *  Set the NextMarker to the current key
-     *  Increment the keys counter
-     *  @param {String} key         - The key to add
-     *  @param {String} versionId   - versionId
-     *  @param {String} value       - The value of the key
-     *  @return {undefined}
-     */
-    addVersion(key: string, versionId: string, value: string) {
-        this.Versions.push({
-            key,
-            versionId,
-            value: this.trimMetadata(value),
-        });
-        this.nextKeyMarker = key;
-        this.nextVersionIdMarker = versionId;
-        ++this.keys;
-    }
-
-    getCommonPrefix(key: string): string | undefined {
-        if (!this.delimiter) {
-            return undefined;
-        }
-        const baseIndex = this.prefix ? this.prefix.length : 0;
-        const delimiterIndex = key.indexOf(this.delimiter, baseIndex);
-        if (delimiterIndex === -1) {
-            return undefined;
-        }
-        return key.substring(0, delimiterIndex + this.delimiter.length);
-    }
-
-    /**
-     * Add a Common Prefix in the list
-     * @param {String} commonPrefix   - common prefix to add
-     * @return {undefined}
-     */
-    addCommonPrefix(commonPrefix: string): void {
-        // add the new prefix to the list
-        this.CommonPrefixes.push(commonPrefix);
-        ++this.keys;
-        this.nextKeyMarker = commonPrefix;
-        this.nextVersionIdMarker = undefined;
-    }
-
-    /**
-     * Cache the current null key, to save it for outputting it later at
-     * the correct position
-     *
-     * @param {String} key        - nonversioned key of the null key
-     * @param {String} versionId  - real version ID of the null key
-     * @param {String} value      - value of the null key
-     * @return {undefined}
-     */
-    cacheNullKey(key: string, versionId: string, value: string): void {
-        this.nullKey = { key, versionId, value };
-    }
-
-    getObjectKeyV0(obj: { key: string }): string {
-        return obj.key;
-    }
-
-    getObjectKeyV1(obj: { key: string }): string {
-        return obj.key.slice(DbPrefixes.Master.length);
-    }
-
-    /**
-     *  Filter to apply on each iteration, based on:
-     *  - prefix
-     *  - delimiter
-     *  - maxKeys
-     *  The marker is being handled directly by levelDB
-     *  @param {Object} obj       - The key and value of the element
-     *  @param {String} obj.key   - The key of the element
-     *  @param {String} obj.value - The value of the element
-     *  @return {number}          - indicates if iteration should continue
-     */
-    filter(obj: { key: string, value: string }): FilterReturnValue {
-        const key = this.getObjectKey(obj);
-        const value = obj.value;
-
-        const { key: nonversionedKey, versionId: keyVersionId } = this.parseKey(key);
-        if (this.nullKey) {
-            if (this.nullKey.key !== nonversionedKey
-                || this.nullKey.versionId < <string> keyVersionId) {
-                this.handleKey(
-                    this.nullKey.key, this.nullKey.versionId, this.nullKey.value);
-                this.nullKey = null;
-            }
-        }
-        if (keyVersionId === '') {
-            // null key
-            this.cacheNullKey(nonversionedKey, Version.from(value).getVersionId(), value);
-            if (this.state.id === DelimiterVersionsFilterStateId.SkippingVersions) {
-                return FILTER_SKIP;
-            }
-            return FILTER_ACCEPT;
-        }
-        return this.handleKey(nonversionedKey, keyVersionId, value);
-    }
-
-    setState(state: FilterState): void {
-        this.state = state;
-    }
-
-    setKeyHandler(stateId: number, keyHandler: KeyHandler): void {
-        this.keyHandlers[stateId] = keyHandler;
-    }
-
-    handleKey(key: string, versionId: string | undefined, value: string): FilterReturnValue {
-        return this.keyHandlers[this.state.id](key, versionId, value);
-    }
-
-    keyHandler_NotSkippingV0(key: string, versionId: string | undefined, value: string): FilterReturnValue {
-        if (key.startsWith(DbPrefixes.Replay)) {
-            // skip internal replay prefix entirely
-            this.setState(<DelimiterVersionsFilterState_SkippingPrefix> {
-                id: DelimiterVersionsFilterStateId.SkippingPrefix,
-                prefix: DbPrefixes.Replay,
-            });
-            return FILTER_SKIP;
-        }
-        if (Version.isPHD(value)) {
-            return FILTER_ACCEPT;
-        }
-        return this.filter_onNewKey(key, versionId, value);
-    }
-
-    keyHandler_NotSkippingV1(key: string, versionId: string | undefined, value: string): FilterReturnValue {
-        // NOTE: this check on PHD is only useful for Artesca, S3C
-        // does not use PHDs in V1 format
-        if (Version.isPHD(value)) {
-            return FILTER_ACCEPT;
-        }
-        return this.filter_onNewKey(key, versionId, value);
-    }
-
-    filter_onNewKey(key: string, versionId: string | undefined, value: string): FilterReturnValue {
-        if (this._reachedMaxKeys()) {
-            return FILTER_END;
-        }
-        if (versionId === undefined) {
-            this.masterKey = key;
-            this.masterVersionId = Version.from(value).getVersionId() || 'null';
-            this.addKey(this.masterKey, this.masterVersionId, value);
-        } else {
-            if (this.masterKey === key && this.masterVersionId === versionId) {
-                // do not add a version key if it is the master version
-                return FILTER_ACCEPT;
-            }
-            this.addKey(key, versionId, value);
-        }
-        return FILTER_ACCEPT;
-    }
-
-    keyHandler_SkippingPrefix(key: string, versionId: string | undefined, value: string): FilterReturnValue {
-        const { prefix } = <DelimiterVersionsFilterState_SkippingPrefix> this.state;
-        if (key.startsWith(prefix)) {
-            return FILTER_SKIP;
-        }
-        this.setState(<DelimiterVersionsFilterState_NotSkipping> {
-            id: DelimiterVersionsFilterStateId.NotSkipping,
-        });
-        return this.handleKey(key, versionId, value);
-    }
-
-    keyHandler_SkippingVersions(key: string, versionId: string | undefined, value: string): FilterReturnValue {
-        if (key === this.keyMarker) {
-            // since the nonversioned key equals the marker, there is
-            // necessarily a versionId in this key
-            const _versionId = <string> versionId;
-            if (_versionId < this.versionIdMarker) {
-                // skip all versions until marker
-                return FILTER_SKIP;
-            }
-            if (_versionId === this.versionIdMarker) {
-                // nothing left to skip, so return ACCEPT, but don't add this version
-                return FILTER_ACCEPT;
-            }
-        }
-        this.setState(<DelimiterVersionsFilterState_NotSkipping> {
-            id: DelimiterVersionsFilterStateId.NotSkipping,
-        });
-        return this.handleKey(key, versionId, value);
-    }
-
-    skippingBase(): string | undefined {
-        switch (this.state.id) {
-        case DelimiterVersionsFilterStateId.SkippingPrefix:
-            const { prefix } = <DelimiterVersionsFilterState_SkippingPrefix> this.state;
-            return inc(prefix);
-
-        case DelimiterVersionsFilterStateId.SkippingVersions:
-            const { gt } = <DelimiterVersionsFilterState_SkippingVersions> this.state;
-            // the contract of skipping() is to return the first key
-            // that can be skipped to, so adding a null byte to skip
-            // over the existing versioned key set in 'gt'
-            return `${gt}\0`;
-
-        default:
-            return SKIP_NONE;
-        }
-    }
-
-    skippingV0() {
-        return this.skippingBase();
-    }
-
-    skippingV1() {
-        const skipTo = this.skippingBase();
-        if (skipTo === SKIP_NONE) {
-            return SKIP_NONE;
-        }
-        // skip to the same object key in both M and V range listings
-        return [
-            `${DbPrefixes.Master}${skipTo}`,
-            `${DbPrefixes.Version}${skipTo}`,
-        ];
-    }
-
-    /**
-     *  Return an object containing all mandatory fields to use once the
-     *  iteration is done, doesn't show a NextMarker field if the output
-     *  isn't truncated
-     *  @return {Object} - following amazon format
-     */
-    result() {
-        // Add the last null key if still in cache (when it is the
-        // last version of the last key)
-        //
-        // NOTE: _reachedMaxKeys sets IsTruncated to true when it
-        // returns true. Here we want this because either:
-        //
-        // - we did not reach the max keys yet so the result is not
-        // - truncated, and there is still room for the null key in
-        // - the results
-        //
-        // - OR we reached it already while having to process a new
-        //   key (so the result is truncated even without the null key)
-        //
-        // - OR we are *just* below the limit but the null key to add
-        //   does not fit, so we know the result is now truncated
-        //   because there remains the null key to be output.
-        //
-        if (this.nullKey) {
-            this.handleKey(this.nullKey.key, this.nullKey.versionId, this.nullKey.value);
-        }
-        const result: ResultObject = {
-            CommonPrefixes: this.CommonPrefixes,
-            Versions: this.Versions,
-            IsTruncated: this.IsTruncated,
-        };
-        if (this.delimiter) {
-            result.Delimiter = this.delimiter;
-        }
-        if (this.IsTruncated) {
-            result.NextKeyMarker = this.nextKeyMarker;
-            if (this.nextVersionIdMarker) {
-                result.NextVersionIdMarker = this.nextVersionIdMarker;
-            }
-        };
-        return result;
-    }
-}
-
-module.exports = { DelimiterVersions };
--- a/lib/algos/list/exportAlgos.js
+++ b/lib/algos/list/exportAlgos.js
@ -6,7 +6,4 @@ module.exports = {
    DelimiterMaster: require('./delimiterMaster')
        .DelimiterMaster,
    MPU: require('./MPU').MultipartUploads,
-    DelimiterCurrent: require('./delimiterCurrent').DelimiterCurrent,
-    DelimiterNonCurrent: require('./delimiterNonCurrent').DelimiterNonCurrent,
-    DelimiterOrphanDeleteMarker: require('./delimiterOrphanDeleteMarker').DelimiterOrphanDeleteMarker,
 };
--- a/lib/algos/list/skip.js
+++ b/lib/algos/list/skip.js
@ -52,21 +52,21 @@ class Skip {
        assert(this.skipRangeCb);

        const filteringResult = this.extension.filter(entry);
-        const skipTo = this.extension.skipping();
+        const skippingRange = this.extension.skipping();

        if (filteringResult === FILTER_END) {
            this.listingEndCb();
        } else if (filteringResult === FILTER_SKIP
-                   && skipTo !== SKIP_NONE) {
+                   && skippingRange !== SKIP_NONE) {
            if (++this.streakLength >= MAX_STREAK_LENGTH) {
                let newRange;
-                if (Array.isArray(skipTo)) {
+                if (Array.isArray(skippingRange)) {
                    newRange = [];
-                    for (let i = 0; i < skipTo.length; ++i) {
-                        newRange.push(skipTo[i]);
+                    for (let i = 0; i < skippingRange.length; ++i) {
+                        newRange.push(this._inc(skippingRange[i]));
                    }
                } else {
-                    newRange = skipTo;
+                    newRange = this._inc(skippingRange);
                }
                /* Avoid to loop on the same range again and again. */
                if (newRange === this.gteParams) {
@ -79,6 +79,16 @@ class Skip {
            this.streakLength = 0;
        }
    }
+
+    _inc(str) {
+        if (!str) {
+            return str;
+        }
+        const lastCharValue = str.charCodeAt(str.length - 1);
+        const lastCharNewValue = String.fromCharCode(lastCharValue + 1);
+
+        return `${str.slice(0, str.length - 1)}${lastCharNewValue}`;
+    }
 }


--- a/lib/auth/AuthInfo.js
+++ b/lib/auth/AuthInfo.js
@ -1,4 +1,6 @@
-import * as constants from '../constants';
+'use strict'; // eslint-disable-line strict
+
+const constants = require('../constants');

 /**
 * Class containing requester's information received from Vault
@ -6,15 +8,9 @@ import * as constants from '../constants';
 * shortid, email, accountDisplayName and IAMdisplayName (if applicable)
 * @return {AuthInfo} an AuthInfo instance
 */
-export default class AuthInfo {
-    arn: string;
-    canonicalID: string;
-    shortid: string;
-    email: string;
-    accountDisplayName: string;
-    IAMdisplayName: string;

-    constructor(objectFromVault: any) {
+class AuthInfo {
+    constructor(objectFromVault) {
        // amazon resource name for IAM user (if applicable)
        this.arn = objectFromVault.arn;
        // account canonicalID
@ -57,8 +53,10 @@ export default class AuthInfo {
        return this.canonicalID.startsWith(
            `${constants.zenkoServiceAccount}/`);
    }
-    isRequesterThisServiceAccount(serviceName: string) {
-        const computedCanonicalID = `${constants.zenkoServiceAccount}/${serviceName}`;
-        return this.canonicalID === computedCanonicalID;
+    isRequesterThisServiceAccount(serviceName) {
+        return this.canonicalID ===
+            `${constants.zenkoServiceAccount}/${serviceName}`;
    }
 }
+
+module.exports = AuthInfo;
--- a/lib/auth/Vault.js
+++ b/lib/auth/Vault.js
@ -1,22 +1,16 @@
-import { Logger } from 'werelogs';
-import errors from '../errors';
-import AuthInfo from './AuthInfo';
+const errors = require('../errors').default;
+const AuthInfo = require('./AuthInfo');

 /** vaultSignatureCb parses message from Vault and instantiates
- * @param err - error from vault
- * @param authInfo - info from vault
- * @param log - log for request
- * @param callback - callback to authCheck functions
- * @param [streamingV4Params] - present if v4 signature;
+ * @param {object} err - error from vault
+ * @param {object} authInfo - info from vault
+ * @param {object} log - log for request
+ * @param {function} callback - callback to authCheck functions
+ * @param {object} [streamingV4Params] - present if v4 signature;
 * items used to calculate signature on chunks if streaming auth
+ * @return {undefined}
 */
-function vaultSignatureCb(
-    err: Error | null,
-    authInfo: { message: { body: any } },
-    log: Logger,
-    callback: (err: Error | null, data?: any, results?: any, params?: any, infos?: any) => void,
-    streamingV4Params?: any
-) {
+function vaultSignatureCb(err, authInfo, log, callback, streamingV4Params) {
    // vaultclient API guarantees that it returns:
    // - either `err`, an Error object with `code` and `message` properties set
    // - or `err == null` and `info` is an object with `message.code` and
@ -30,101 +24,58 @@ function vaultSignatureCb(
    const info = authInfo.message.body;
    const userInfo = new AuthInfo(info.userInfo);
    const authorizationResults = info.authorizationResults;
-    const auditLog: { accountDisplayName: string, IAMdisplayName?: string } =
-        { accountDisplayName: userInfo.getAccountDisplayName() };
+    const auditLog = { accountDisplayName: userInfo.getAccountDisplayName() };
    const iamDisplayName = userInfo.getIAMdisplayName();
    if (iamDisplayName) {
        auditLog.IAMdisplayName = iamDisplayName;
    }
-    // @ts-ignore
    log.addDefaultFields(auditLog);
-    return callback(null, userInfo, authorizationResults, streamingV4Params, {
-        accountQuota: info.accountQuota || {},
-    });
+    return callback(null, userInfo, authorizationResults, streamingV4Params);
 }

-export type AuthV4RequestParams = {
-    version: 4;
-    log: Logger;
-    data: {
-        accessKey: string;
-        signatureFromRequest: string;
-        region: string;
-        stringToSign: string;
-        scopeDate: string;
-        authType: 'query' | 'header';
-        signatureVersion: string;
-        signatureAge?: number;
-        timestamp: number;
-        credentialScope: string;
-        securityToken: string;
-        algo: string;
-        log: Logger;
-    };
-};

 /**
 * Class that provides common authentication methods against different
 * authentication backends.
 * @class Vault
 */
-export default class Vault {
-    client: any;
-    implName: string;
-
+class Vault {
    /**
     * @constructor
     * @param {object} client - authentication backend or vault client
     * @param {string} implName - implementation name for auth backend
     */
-    constructor(client: any, implName: string) {
+    constructor(client, implName) {
        this.client = client;
        this.implName = implName;
    }
    /**
     * authenticateV2Request
     *
-     * @param params - the authentication parameters as returned by
+     * @param {string} params - the authentication parameters as returned by
     *                          auth.extractParams
-     * @param params.version - shall equal 2
-     * @param params.data.accessKey - the user's accessKey
-     * @param params.data.signatureFromRequest - the signature read
+     * @param {number} params.version - shall equal 2
+     * @param {string} params.data.accessKey - the user's accessKey
+     * @param {string} params.data.signatureFromRequest - the signature read
     *                                                    from the request
-     * @param params.data.stringToSign - the stringToSign
-     * @param params.data.algo - the hashing algorithm used for the
+     * @param {string} params.data.stringToSign - the stringToSign
+     * @param {string} params.data.algo - the hashing algorithm used for the
     *                                    signature
-     * @param params.data.authType - the type of authentication (query
+     * @param {string} params.data.authType - the type of authentication (query
     *                                        or header)
-     * @param params.data.signatureVersion - the version of the
+     * @param {string} params.data.signatureVersion - the version of the
     *                                                signature (AWS or AWS4)
-     * @param [params.data.signatureAge] - the age of the signature in
+     * @param {number} [params.data.signatureAge] - the age of the signature in
     *                                              ms
-     * @param params.data.log - the logger object
+     * @param {string} params.data.log - the logger object
     * @param {RequestContext []} requestContexts - an array of RequestContext
     * instances which contain information for policy authorization check
-     * @param callback - callback with either error or user info
+     * @param {function} callback - callback with either error or user info
+     * @returns {undefined}
     */
-    authenticateV2Request(
-        params: {
-            version: 2;
-            log: Logger;
-            data: {
-                securityToken: string;
-                accessKey: string;
-                signatureFromRequest: string;
-                stringToSign: string;
-                algo: string;
-                authType: 'query' | 'header';
-                signatureVersion: string;
-                signatureAge?: number;
-                log: Logger;
-            };
-        },
-        requestContexts: any[],
-        callback: (err: Error | null, data?: any) => void
-    ) {
+    authenticateV2Request(params, requestContexts, callback) {
        params.log.debug('authenticating V2 request');
-        let serializedRCsArr: any;
+        let serializedRCsArr;
        if (requestContexts) {
            serializedRCsArr = requestContexts.map(rc => rc.serialize());
        }
@ -134,48 +85,44 @@ export default class Vault {
            params.data.accessKey,
            {
                algo: params.data.algo,
-                // @ts-ignore
                reqUid: params.log.getSerializedUids(),
                logger: params.log,
                securityToken: params.data.securityToken,
                requestContext: serializedRCsArr,
            },
-            (err: Error | null, userInfo?: any) => vaultSignatureCb(err, userInfo,
-                params.log, callback),
+            (err, userInfo) => vaultSignatureCb(err, userInfo,
+                                                params.log, callback)
        );
    }

    /** authenticateV4Request
-     * @param params - the authentication parameters as returned by
+     * @param {object} params - the authentication parameters as returned by
     *                          auth.extractParams
-     * @param params.version - shall equal 4
-     * @param params.data.log - the logger object
-     * @param params.data.accessKey - the user's accessKey
-     * @param params.data.signatureFromRequest - the signature read
+     * @param {number} params.version - shall equal 4
+     * @param {string} params.data.log - the logger object
+     * @param {string} params.data.accessKey - the user's accessKey
+     * @param {string} params.data.signatureFromRequest - the signature read
     *                                                    from the request
-     * @param params.data.region - the AWS region
-     * @param params.data.stringToSign - the stringToSign
-     * @param params.data.scopeDate - the timespan to allow the request
-     * @param params.data.authType - the type of authentication (query
+     * @param {string} params.data.region - the AWS region
+     * @param {string} params.data.stringToSign - the stringToSign
+     * @param {string} params.data.scopeDate - the timespan to allow the request
+     * @param {string} params.data.authType - the type of authentication (query
     *                                        or header)
-     * @param params.data.signatureVersion - the version of the
+     * @param {string} params.data.signatureVersion - the version of the
     *                                                signature (AWS or AWS4)
-     * @param params.data.signatureAge - the age of the signature in ms
-     * @param params.data.timestamp - signaure timestamp
-     * @param params.credentialScope - credentialScope for signature
+     * @param {number} params.data.signatureAge - the age of the signature in ms
+     * @param {number} params.data.timestamp - signaure timestamp
+     * @param {string} params.credentialScope - credentialScope for signature
     * @param {RequestContext [] | null} requestContexts -
     * an array of RequestContext or null if authenticaiton of a chunk
     * in streamingv4 auth
     * instances which contain information for policy authorization check
-     * @param callback - callback with either error or user info
+     * @param {function} callback - callback with either error or user info
+     * @return {undefined}
    */
-    authenticateV4Request(
-        params: AuthV4RequestParams,
-        requestContexts: any[] | null,
-        callback: (err: Error | null, data?: any) => void
-    ) {
+    authenticateV4Request(params, requestContexts, callback) {
        params.log.debug('authenticating V4 request');
-        let serializedRCs: any;
+        let serializedRCs;
        if (requestContexts) {
            serializedRCs = requestContexts.map(rc => rc.serialize());
        }
@ -193,39 +140,31 @@ export default class Vault {
            params.data.region,
            params.data.scopeDate,
            {
-                // @ts-ignore
                reqUid: params.log.getSerializedUids(),
                logger: params.log,
                securityToken: params.data.securityToken,
                requestContext: serializedRCs,
            },
-            (err: Error | null, userInfo?: any) => vaultSignatureCb(err, userInfo,
-                params.log, callback, streamingV4Params),
+            (err, userInfo) => vaultSignatureCb(err, userInfo,
+                params.log, callback, streamingV4Params)
        );
    }

    /** getCanonicalIds -- call Vault to get canonicalIDs based on email
     * addresses
-     * @param emailAddresses - list of emailAddresses
-     * @param log - log object
-     * @param callback - callback with either error or an array
+     * @param {array} emailAddresses - list of emailAddresses
+     * @param {object} log - log object
+     * @param {function} callback - callback with either error or an array
     * of objects with each object containing the canonicalID and emailAddress
     * of an account as properties
+     * @return {undefined}
    */
-    getCanonicalIds(
-        emailAddresses: string[],
-        log: Logger,
-        callback: (
-            err: Error | null,
-            data?: { canonicalID: string; email: string }[]
-        ) => void
-    ) {
+    getCanonicalIds(emailAddresses, log, callback) {
        log.trace('getting canonicalIDs from Vault based on emailAddresses',
            { emailAddresses });
        this.client.getCanonicalIds(emailAddresses,
-            // @ts-ignore
            { reqUid: log.getSerializedUids() },
-            (err: Error | null, info?: any) => {
+            (err, info) => {
                if (err) {
                    log.debug('received error message from auth provider',
                        { errorMessage: err });
@ -233,17 +172,17 @@ export default class Vault {
                }
                const infoFromVault = info.message.body;
                log.trace('info received from vault', { infoFromVault });
-                const foundIds: { canonicalID: string; email: string }[] = [];
+                const foundIds = [];
                for (let i = 0; i < Object.keys(infoFromVault).length; i++) {
                    const key = Object.keys(infoFromVault)[i];
                    if (infoFromVault[key] === 'WrongFormat'
                    || infoFromVault[key] === 'NotFound') {
                        return callback(errors.UnresolvableGrantByEmailAddress);
                    }
-                    foundIds.push({
-                        email: key,
-                        canonicalID: infoFromVault[key],
-                    })
+                    const obj = {};
+                    obj.email = key;
+                    obj.canonicalID = infoFromVault[key];
+                    foundIds.push(obj);
                }
                return callback(null, foundIds);
            });
@ -251,22 +190,18 @@ export default class Vault {

    /** getEmailAddresses -- call Vault to get email addresses based on
     * canonicalIDs
-     * @param canonicalIDs - list of canonicalIDs
-     * @param log - log object
-     * @param callback - callback with either error or an object
+     * @param {array} canonicalIDs - list of canonicalIDs
+     * @param {object} log - log object
+     * @param {function} callback - callback with either error or an object
     * with canonicalID keys and email address values
+     * @return {undefined}
    */
-    getEmailAddresses(
-        canonicalIDs: string[],
-        log: Logger,
-        callback: (err: Error | null, data?: { [key: string]: any }) => void
-    ) {
+    getEmailAddresses(canonicalIDs, log, callback) {
        log.trace('getting emailAddresses from Vault based on canonicalIDs',
            { canonicalIDs });
        this.client.getEmailAddresses(canonicalIDs,
-            // @ts-ignore
            { reqUid: log.getSerializedUids() },
-            (err: Error | null, info?: any) => {
+            (err, info) => {
                if (err) {
                    log.debug('received error message from vault',
                        { errorMessage: err });
@ -289,22 +224,18 @@ export default class Vault {

    /** getAccountIds -- call Vault to get accountIds based on
     * canonicalIDs
-     * @param canonicalIDs - list of canonicalIDs
-     * @param log - log object
-     * @param callback - callback with either error or an object
+     * @param {array} canonicalIDs - list of canonicalIDs
+     * @param {object} log - log object
+     * @param {function} callback - callback with either error or an object
     * with canonicalID keys and accountId values
+     * @return {undefined}
    */
-    getAccountIds(
-        canonicalIDs: string[],
-        log: Logger,
-        callback: (err: Error | null, data?: { [key: string]: string }) => void
-    ) {
+    getAccountIds(canonicalIDs, log, callback) {
        log.trace('getting accountIds from Vault based on canonicalIDs',
        { canonicalIDs });
        this.client.getAccountIds(canonicalIDs,
-            // @ts-expect-error
        { reqUid: log.getSerializedUids() },
-            (err: Error | null, info?: any) => {
+        (err, info) => {
            if (err) {
                log.debug('received error message from vault',
                    { errorMessage: err });
@ -337,19 +268,14 @@ export default class Vault {
     * @param {object} log - log object
     * @param {function} callback - callback with either error or an array
     * of authorization results
+     * @return {undefined}
    */
-    checkPolicies(
-        requestContextParams: any[],
-        userArn: string,
-        log: Logger,
-        callback: (err: Error | null, data?: any[]) => void
-    ) {
+    checkPolicies(requestContextParams, userArn, log, callback) {
        log.trace('sending request context params to vault to evaluate' +
        'policies');
        this.client.checkPolicies(requestContextParams, userArn, {
-            // @ts-ignore
            reqUid: log.getSerializedUids(),
-        }, (err: Error | null, info?: any) => {
+        }, (err, info) => {
            if (err) {
                log.debug('received error message from auth provider',
                    { error: err });
@ -360,14 +286,13 @@ export default class Vault {
        });
    }

-    checkHealth(log: Logger, callback: (err: Error | null, data?: any) => void) {
+    checkHealth(log, callback) {
        if (!this.client.healthcheck) {
            const defResp = {};
            defResp[this.implName] = { code: 200, message: 'OK' };
            return callback(null, defResp);
        }
-        // @ts-ignore
-        return this.client.healthcheck(log.getSerializedUids(), (err: Error | null, obj?: any) => {
+        return this.client.healthcheck(log.getSerializedUids(), (err, obj) => {
            const respBody = {};
            if (err) {
                log.debug(`error from ${this.implName}`, { error: err });
@ -386,19 +311,6 @@ export default class Vault {
            return callback(null, respBody);
        });
    }
-
-    report(log: Logger, callback: (err: Error | null, data?: any) => void) {
-        // call the report function of the client
-        if (!this.client.report) {
-            return callback(null, {});
-        }
-        // @ts-ignore
-        return this.client.report(log.getSerializedUids(), (err: Error | null, obj?: any) => {
-            if (err) {
-                log.debug(`error from ${this.implName}`, { error: err });
-                return callback(err);
-            }
-            return callback(null, obj);
-        });
-    }
 }
+
+module.exports = Vault;
--- a/lib/auth/auth.js
+++ b/lib/auth/auth.js
@ -1,23 +1,22 @@
-import * as crypto from 'crypto';
-import { Logger } from 'werelogs';
-import errors from '../errors';
-import * as queryString from 'querystring';
-import AuthInfo from './AuthInfo';
-import * as v2 from './v2/authV2';
-import * as v4 from './v4/authV4';
-import * as constants from '../constants';
-import constructStringToSignV2 from './v2/constructStringToSign';
-import constructStringToSignV4 from './v4/constructStringToSign';
-import { convertUTCtoISO8601 } from './v4/timeUtils';
-import * as vaultUtilities from './backends/in_memory/vaultUtilities';
-import * as inMemoryBackend from './backends/in_memory/Backend';
-import baseBackend from './backends/base';
-import chainBackend from './backends/ChainBackend';
-import validateAuthConfig from './backends/in_memory/validateAuthConfig';
-import AuthLoader from './backends/in_memory/AuthLoader';
-import Vault from './Vault';
+'use strict'; // eslint-disable-line strict

-let vault: Vault | null = null;
+const crypto = require('crypto');
+const errors = require('../errors').default;
+const queryString = require('querystring');
+const AuthInfo = require('./AuthInfo');
+const v2 = require('./v2/authV2');
+const v4 = require('./v4/authV4');
+const constants = require('../constants');
+const constructStringToSignV2 = require('./v2/constructStringToSign');
+const constructStringToSignV4 = require('./v4/constructStringToSign');
+const convertUTCtoISO8601 = require('./v4/timeUtils').convertUTCtoISO8601;
+const vaultUtilities = require('./in_memory/vaultUtilities');
+const backend = require('./in_memory/Backend');
+const validateAuthConfig = require('./in_memory/validateAuthConfig');
+const AuthLoader = require('./in_memory/AuthLoader');
+const Vault = require('./Vault');
+
+let vault = null;
 const auth = {};
 const checkFunctions = {
    v2: {
@ -34,7 +33,7 @@ const checkFunctions = {
 // 'All Users Group' so use this group as the canonicalID for the publicUser
 const publicUserInfo = new AuthInfo({ canonicalID: constants.publicId });

-function setAuthHandler(handler: Vault) {
+function setAuthHandler(handler) {
    vault = handler;
    return auth;
 }
@ -42,30 +41,25 @@ function setAuthHandler(handler: Vault) {
 /**
 * This function will check validity of request parameters to authenticate
 *
- * @param request - Http request object
- * @param log - Logger object
- * @param awsService - Aws service related
- * @param data - Parameters from queryString parsing or body of
+ * @param {Http.Request} request - Http request object
+ * @param {object} log - Logger object
+ * @param {string} awsService - Aws service related
+ * @param {object} data - Parameters from queryString parsing or body of
 *      POST request
 *
- * @return ret
- * @return ret.err - arsenal.errors object if any error was found
- * @return ret.params - auth parameters to use later on for signature
+ * @return {object} ret
+ * @return {object} ret.err - arsenal.errors object if any error was found
+ * @return {object} ret.params - auth parameters to use later on for signature
 *                               computation and check
- * @return ret.params.version - the auth scheme version
+ * @return {object} ret.params.version - the auth scheme version
 *                                       (undefined, 2, 4)
- * @return ret.params.data - the auth scheme's specific data
+ * @return {object} ret.params.data - the auth scheme's specific data
 */
-function extractParams(
-    request: any,
-    log: Logger,
-    awsService: string,
-    data: { [key: string]: string }
-) {
+function extractParams(request, log, awsService, data) {
    log.trace('entered', { method: 'Arsenal.auth.server.extractParams' });
    const authHeader = request.headers.authorization;
-    let version: 'v2' |'v4' | null = null;
-    let method: 'query' | 'headers' | null = null;
+    let version = null;
+    let method = null;

    // Identify auth version and method to dispatch to the right check function
    if (authHeader) {
@ -108,21 +102,16 @@ function extractParams(
 /**
 * This function will check validity of request parameters to authenticate
 *
- * @param request - Http request object
- * @param log - Logger object
- * @param cb - the callback
- * @param awsService - Aws service related
+ * @param {Http.Request} request - Http request object
+ * @param {object} log - Logger object
+ * @param {function} cb - the callback
+ * @param {string} awsService - Aws service related
 * @param {RequestContext[] | null} requestContexts - array of RequestContext
 * or null if no requestContexts to be sent to Vault (for instance,
 * in multi-object delete request)
+ * @return {undefined}
 */
-function doAuth(
-    request: any,
-    log: Logger,
-    cb: (err: Error | null, data?: any) => void,
-    awsService: string,
-    requestContexts: any[] | null
-) {
+function doAuth(request, log, cb, awsService, requestContexts) {
    const res = extractParams(request, log, awsService, request.query);
    if (res.err) {
        return cb(res.err);
@ -130,31 +119,23 @@ function doAuth(
        return cb(null, res.params);
    }
    if (requestContexts) {
-        requestContexts.forEach((requestContext) => {
-            const { params } = res
-            if ('data' in params) {
-                const { data } = params
-                requestContext.setAuthType(data.authType);
-                requestContext.setSignatureVersion(data.signatureVersion);
-                requestContext.setSecurityToken(data.securityToken);
-                if ('signatureAge' in data) {
-                    requestContext.setSignatureAge(data.signatureAge);
-                }
-            }
+        requestContexts.forEach(requestContext => {
+            requestContext.setAuthType(res.params.data.authType);
+            requestContext.setSignatureVersion(res.params
+                .data.signatureVersion);
+            requestContext.setSignatureAge(res.params.data.signatureAge);
+            requestContext.setSecurityToken(res.params.data.securityToken);
        });
    }

    // Corner cases managed, we're left with normal auth
-    // TODO What's happening here?
-    // @ts-ignore
    res.params.log = log;
    if (res.params.version === 2) {
-        // @ts-ignore
-        return vault!.authenticateV2Request(res.params, requestContexts, cb);
+        return vault.authenticateV2Request(res.params, requestContexts, cb);
    }
    if (res.params.version === 4) {
-        // @ts-ignore
-        return vault!.authenticateV4Request(res.params, requestContexts, cb);
+        return vault.authenticateV4Request(res.params, requestContexts, cb,
+            awsService);
    }

    log.error('authentication method not found', {
@ -163,44 +144,22 @@ function doAuth(
    return cb(errors.InternalError);
 }

-/**
- * This function will generate a version 4 content-md5 header
- * It looks at the request path to determine what kind of header encoding is required
- *
- * @param path - the request path
- * @param payload - the request payload to hash
- */
-function generateContentMD5Header(
-    path: string,
-    payload: string,
-) {
-    const encoding = path && path.startsWith('/_/backbeat/') ? 'hex' : 'base64';
-    return crypto.createHash('md5').update(payload, 'binary').digest(encoding);
-}
 /**
 * This function will generate a version 4 header
 *
- * @param request - Http request object
- * @param data - Parameters from queryString parsing or body of
+ * @param {Http.Request} request - Http request object
+ * @param {object} data - Parameters from queryString parsing or body of
 *                        POST request
- * @param accessKey - the accessKey
- * @param secretKeyValue - the secretKey
- * @param awsService - Aws service related
- * @param [proxyPath] - path that gets proxied by reverse proxy
- * @param [sessionToken] - security token if the access/secret keys
+ * @param {string} accessKey - the accessKey
+ * @param {string} secretKeyValue - the secretKey
+ * @param {string} awsService - Aws service related
+ * @param {sting} [proxyPath] - path that gets proxied by reverse proxy
+ * @param {string} [sessionToken] - security token if the access/secret keys
 *                                are temporary credentials from STS
- * @param [payload] - body of the request if any
+ * @return {undefined}
 */
-function generateV4Headers(
-    request: any,
-    data: { [key: string]: string },
-    accessKey: string,
-    secretKeyValue: string,
-    awsService: string,
-    proxyPath?: string,
-    sessionToken?: string,
-    payload?: string,
-) {
+function generateV4Headers(request, data, accessKey, secretKeyValue,
+                           awsService, proxyPath, sessionToken) {
    Object.assign(request, { headers: {} });
    const amzDate = convertUTCtoISO8601(Date.now());
    // get date without time
@ -212,9 +171,9 @@ function generateV4Headers(
    const timestamp = amzDate;
    const algorithm = 'AWS4-HMAC-SHA256';

-    payload = payload || '';
+    let payload = '';
    if (request.method === 'POST') {
-        payload = queryString.stringify(data, undefined, undefined, {
+        payload = queryString.stringify(data, null, null, {
            encodeURIComponent,
        });
    }
@ -223,7 +182,6 @@ function generateV4Headers(
    request.setHeader('host', request._headers.host);
    request.setHeader('x-amz-date', amzDate);
    request.setHeader('x-amz-content-sha256', payloadChecksum);
-    request.setHeader('content-md5', generateContentMD5Header(request.path, payload));

    if (sessionToken) {
        request.setHeader('x-amz-security-token', sessionToken);
@ -234,8 +192,7 @@ function generateV4Headers(
        .filter(headerName =>
            headerName.startsWith('x-amz-')
            || headerName.startsWith('x-scal-')
-            || headerName === 'content-md5'
-            || headerName === 'host',
+            || headerName === 'host'
        ).sort().join(';');
    const params = { request, signedHeaders, payloadChecksum,
        credentialScope, timestamp, query: data,
@ -246,7 +203,7 @@ function generateV4Headers(
                                                          scopeDate,
                                                          service);
    const signature = crypto.createHmac('sha256', signingKey)
-        .update(stringToSign as string, 'binary').digest('hex');
+        .update(stringToSign, 'binary').digest('hex');
    const authorizationHeader = `${algorithm} Credential=${accessKey}` +
        `/${credentialScope}, SignedHeaders=${signedHeaders}, ` +
        `Signature=${signature}`;
@ -254,12 +211,21 @@ function generateV4Headers(
    Object.assign(request, { headers: {} });
 }

-export const server = { extractParams, doAuth }
-export const client = { generateV4Headers, constructStringToSignV2 }
-export const inMemory = { backend: inMemoryBackend, validateAuthConfig, AuthLoader }
-export const backends = { baseBackend, chainBackend }
-export {
-    setAuthHandler as setHandler,
+module.exports = {
+    setHandler: setAuthHandler,
+    server: {
+        extractParams,
+        doAuth,
+    },
+    client: {
+        generateV4Headers,
+        constructStringToSignV2,
+    },
+    inMemory: {
+        backend,
+        validateAuthConfig,
+        AuthLoader,
+    },
    AuthInfo,
-    Vault
-}
+    Vault,
+};
--- a/lib/auth/backends/ChainBackend.ts
+++ b/lib/auth/backends/ChainBackend.ts
@ -1,233 +0,0 @@
-import assert from 'assert';
-import async from 'async';
-import errors from '../../errors';
-import BaseBackend from './base';
-
-/**
- * Class that provides an authentication backend that will verify signatures
- * and retrieve emails and canonical ids associated with an account using a
- * given list of authentication backends and vault clients.
- *
- * @class ChainBackend
- */
-export default class ChainBackend extends BaseBackend {
-    _clients: any[];
-
-    /**
-     * @constructor
-     * @param {string} service - service id
-     * @param {object[]} clients - list of authentication backends or vault clients
-     */
-    constructor(service: string, clients: any[]) {
-        super(service);
-
-        assert(Array.isArray(clients) && clients.length > 0, 'invalid client list');
-        assert(clients.every(client =>
-            typeof client.verifySignatureV4 === 'function' &&
-            typeof client.verifySignatureV2 === 'function' &&
-            typeof client.getCanonicalIds === 'function' &&
-            typeof client.getEmailAddresses === 'function' &&
-            typeof client.checkPolicies === 'function' &&
-            typeof client.healthcheck === 'function',
-        ), 'invalid client: missing required auth backend methods');
-        this._clients = clients;
-    }
-
-
-    /*
-     * try task against each client for one to be successful
-     */
-    _tryEachClient(task: any, cb: any) {
-        // @ts-ignore
-        async.tryEach(this._clients.map(client => done => task(client, done)), cb);
-    }
-
-    /*
-     * apply task to all clients
-     */
-    _forEachClient(task: any, cb: any) {
-        async.map(this._clients, task, cb);
-    }
-
-    verifySignatureV2(
-        stringToSign: string,
-        signatureFromRequest: string,
-        accessKey: string,
-        options: any,
-        callback: any,
-      ) {
-        this._tryEachClient((client, done) => client.verifySignatureV2(
-            stringToSign,
-            signatureFromRequest,
-            accessKey,
-            options,
-            done,
-        ), callback);
-    }
-
-    verifySignatureV4(
-      stringToSign: string,
-      signatureFromRequest: string,
-      accessKey: string,
-      region: string,
-      scopeDate: string,
-      options: any,
-      callback: any,
-    ) {
-        this._tryEachClient((client, done) => client.verifySignatureV4(
-            stringToSign,
-            signatureFromRequest,
-            accessKey,
-            region,
-            scopeDate,
-            options,
-            done,
-        ), callback);
-    }
-
-    static _mergeObjects(objectResponses: any) {
-        return objectResponses.reduce(
-            (retObj, resObj) => Object.assign(retObj, resObj.message.body),
-            {});
-    }
-
-    getCanonicalIds(emailAddresses: string[], options: any, callback: any) {
-        this._forEachClient(
-            (client, done) => client.getCanonicalIds(emailAddresses, options, done),
-            (err, res) => {
-                if (err) {
-                    return callback(err);
-                }
-                // TODO: atm naive merge, better handling of conflicting email results
-                return callback(null, {
-                    message: {
-                        body: ChainBackend._mergeObjects(res),
-                    },
-                });
-            });
-    }
-
-    getEmailAddresses(canonicalIDs: string[], options: any, callback: any) {
-        this._forEachClient(
-            (client, done) => client.getEmailAddresses(canonicalIDs, options, done),
-            (err, res) => {
-                if (err) {
-                    return callback(err);
-                }
-                return callback(null, {
-                    message: {
-                        body: ChainBackend._mergeObjects(res),
-                    },
-                });
-            });
-    }
-
-    /*
-     * merge policy responses into a single message
-     */
-    static _mergePolicies(policyResponses: any) {
-        const policyMap: any = {};
-
-        policyResponses.forEach(resp => {
-            if (!resp.message || !Array.isArray(resp.message.body)) {
-                return;
-            }
-
-            const check = (policy) => {
-                const key = (policy.arn || '') + (policy.versionId || '') + (policy.action || '');
-                if (!policyMap[key] || !policyMap[key].isAllowed) {
-                    policyMap[key] = policy;
-                }
-                // else is duplicate policy
-            };
-
-            resp.message.body.forEach(policy => {
-                if (Array.isArray(policy)) {
-                    policy.forEach(authResult => check(authResult));
-                } else {
-                    check(policy);
-                }
-            });
-        });
-
-        return Object.keys(policyMap).map(key => {
-            const policyRes: any = { isAllowed: policyMap[key].isAllowed };
-            if (policyMap[key].arn !== '') {
-                policyRes.arn = policyMap[key].arn;
-            }
-            if (policyMap[key].versionId) {
-                policyRes.versionId = policyMap[key].versionId;
-            }
-            if (policyMap[key].isImplicit !== undefined) {
-                policyRes.isImplicit = policyMap[key].isImplicit;
-            }
-            if (policyMap[key].action) {
-                policyRes.action = policyMap[key].action;
-            }
-            return policyRes;
-        });
-    }
-
-    /*
-        response format:
-            {  message: {
-                body: [{}],
-                code: number,
-                message: string,
-            } }
-     */
-    checkPolicies(requestContextParams: any, userArn: string, options: any, callback: any) {
-        this._forEachClient((client, done) => client.checkPolicies(
-            requestContextParams,
-            userArn,
-            options,
-            done,
-        ), (err, res) => {
-            if (err) {
-                return callback(err);
-            }
-            return callback(null, {
-                message: {
-                    body: ChainBackend._mergePolicies(res),
-                },
-            });
-        });
-    }
-
-    healthcheck(reqUid: string, callback: any) {
-        this._forEachClient((client, done) =>
-            client.healthcheck(reqUid, (err, res) => done(null, {
-                error: !!err ? err : null,
-                status: res,
-            }),
-            ), (err, res) => {
-            if (err) {
-                return callback(err);
-            }
-
-            const isError = res.some(results => !!results.error);
-            if (isError) {
-                return callback(errors.InternalError, res);
-            }
-            return callback(null, res);
-        });
-    }
-
-    report(reqUid: string, callback: any) {
-        this._forEachClient((client, done) =>
-            client.report(reqUid, done),
-            (err, res) => {
-                if (err) {
-                    return callback(err);
-                }
-                const mergedRes = res.reduce((acc, val) => {
-                    Object.keys(val).forEach(k => {
-                        acc[k] = val[k];
-                    });
-                    return acc;
-                }, {});
-
-                return callback(null, mergedRes);
-            });
-    }
-}
--- a/lib/auth/backends/base.ts
+++ b/lib/auth/backends/base.ts
@ -1,96 +0,0 @@
-import errors from '../../errors';
-
-/**
- * Base backend class
- *
- * @class BaseBackend
- */
-export default class BaseBackend {
-    service: string;
-
-    /**
-     * @constructor
-     * @param {string} service - service identifer for construction arn
-     */
-    constructor(service: string) {
-        this.service = service;
-    }
-
-    /** verifySignatureV2
-    * @param stringToSign - string to sign built per AWS rules
-    * @param signatureFromRequest - signature sent with request
-    * @param accessKey - account accessKey
-    * @param options - contains algorithm (SHA1 or SHA256)
-    * @param callback - callback with either error or user info
-    * @return calls callback
-    */
-    verifySignatureV2(
-        stringToSign: string,
-        signatureFromRequest: string,
-        accessKey: string,
-        options: any,
-        callback: any
-    ) {
-        return callback(errors.AuthMethodNotImplemented);
-    }
-
-
-    /** verifySignatureV4
-     * @param stringToSign - string to sign built per AWS rules
-     * @param signatureFromRequest - signature sent with request
-     * @param accessKey - account accessKey
-     * @param region - region specified in request credential
-     * @param scopeDate - date specified in request credential
-     * @param options - options to send to Vault
-     * (just contains reqUid for logging in Vault)
-     * @param callback - callback with either error or user info
-     * @return calls callback
-     */
-    verifySignatureV4(
-        stringToSign: string,
-        signatureFromRequest: string,
-        accessKey: string,
-        region: string,
-        scopeDate: string,
-        options: any,
-        callback: any
-    ) {
-        return callback(errors.AuthMethodNotImplemented);
-    }
-
-    /**
-     * Gets canonical ID's for a list of accounts
-     * based on email associated with account
-     * @param emails - list of email addresses
-     * @param options - to send log id to vault
-     * @param callback - callback to calling function
-     * @returns callback with either error or
-     * object with email addresses as keys and canonical IDs
-     * as values
-     */
-    getCanonicalIds(emails: string[], options: any, callback: any) {
-        return callback(errors.AuthMethodNotImplemented);
-    }
-
-    /**
-     * Gets email addresses (referred to as diplay names for getACL's)
-     * for a list of accounts based on canonical IDs associated with account
-     * @param canonicalIDs - list of canonicalIDs
-     * @param options - to send log id to vault
-     * @param callback - callback to calling function
-     * @returns callback with either error or
-     * an object from Vault containing account canonicalID
-     * as each object key and an email address as the value (or "NotFound")
-     */
-    getEmailAddresses(canonicalIDs: string[], options: any, callback: any) {
-        return callback(errors.AuthMethodNotImplemented);
-    }
-
-    checkPolicies(requestContextParams: any, userArn: string, options: any, callback: any) {
-        return callback(null, { message: { body: [] } });
-    }
-
-    healthcheck(reqUid: string, callback: any) {
-        return callback(null, { code: 200, message: 'OK' });
-    }
-}
--- a/lib/auth/backends/in_memory/AuthLoader.ts
+++ b/lib/auth/backends/in_memory/AuthLoader.ts
@ -1,204 +0,0 @@
-import * as fs from 'fs';
-import glob from 'simple-glob';
-import joi from 'joi';
-import werelogs from 'werelogs';
-import * as types from './types';
-import { Account, Accounts } from './types';
-import ARN from '../../../models/ARN';
-
-/** Load authentication information from files or pre-loaded account objects */
-export default class AuthLoader {
-    #log: werelogs.Logger;
-    #authData: Accounts;
-    #isValid: 'waiting-for-validation' | 'valid' | 'invalid';
-
-    constructor(logApi: { Logger: typeof werelogs.Logger } = werelogs) {
-        this.#log = new logApi.Logger('S3');
-        this.#authData = { accounts: [] };
-        this.#isValid = 'waiting-for-validation';
-    }
-
-    /** Add one or more accounts to the authentication info */
-    addAccounts(authData: Accounts, filePath?: string) {
-        const isValid = this.#isAuthDataValid(authData, filePath);
-        if (isValid) {
-            this.#authData.accounts = [
-                ...this.#authData.accounts,
-                ...authData.accounts,
-            ];
-            // defer validity checking when getting data to avoid
-            // logging multiple times the errors (we need to validate
-            // all accounts at once to detect duplicate values)
-            if (this.#isValid === 'valid') {
-                this.#isValid = 'waiting-for-validation';
-            }
-        } else {
-            this.#isValid = 'invalid';
-        }
-    }
-
-    /**
-     * Add account information from a file. Use { legacy: false } as an option
-     *  to use the new, Promise-based version.
-     *
-     * @param filePath - file path containing JSON
-     *   authentication info (see {@link addAccounts()} for format)
-     */
-    addFile(filePath: string, options: { legacy: false }): Promise<void>;
-    /** @deprecated Please use Promise-version instead. */
-    addFile(filePath: string, options?: { legacy: true }): void;
-    addFile(filePath: string, options = { legacy: true }) {
-        // On deprecation, remove the legacy part and keep the promises.
-        const readFunc: any = options.legacy ? fs.readFileSync : fs.promises.readFile;
-        const readResult = readFunc(filePath, 'utf8') as Promise<string> | string;
-        const prom = Promise.resolve(readResult).then((data) => {
-            const authData = JSON.parse(data);
-            this.addAccounts(authData, filePath);
-        });
-        return options.legacy ? undefined : prom;
-    }
-
-    /**
-     * Add account information from a filesystem path
-     *
-     * @param globPattern - filesystem glob pattern,
-     *   can be a single string or an array of glob patterns. Globs
-     *   can be simple file paths or can contain glob matching
-     *   characters, like '/a/b/*.json'. The matching files are
-     *   individually loaded as JSON and accounts are added. See
-     *   {@link addAccounts()} for JSON format.
-     */
-    addFilesByGlob(globPattern: string | string[]) {
-        // FIXME switch glob to async version
-        const files = glob(globPattern);
-        files.forEach((filePath) => this.addFile(filePath));
-    }
-
-    /**
-     * Perform validation on authentication info previously
-     * loaded. Note that it has to be done on the entire set after an
-     * update to catch duplicate account IDs or access keys.
-     */
-    validate() {
-        if (this.#isValid === 'waiting-for-validation') {
-            const isValid = this.#isAuthDataValid(this.#authData);
-            this.#isValid = isValid ? 'valid' : 'invalid';
-        }
-        return this.#isValid === 'valid';
-    }
-
-    /**
-     * Get authentication info as a plain JS object containing all accounts
-     * under the "accounts" attribute, with validation.
-     */
-    get data() {
-        return this.validate() ? this.#authData : null;
-    }
-
-    /** backward-compat: ignore arn if starts with 'aws:' and log a warning */
-    #isNotLegacyAWSARN(account: Account, filePath?: string) {
-        if (account.arn.startsWith('aws:')) {
-            const { name: accountName, arn: accountArn } = account;
-            this.#log.error(
-                'account must have a valid AWS ARN, legacy examples ' +
-                    "starting with 'aws:' are not supported anymore. " +
-                    'Please convert to a proper account entry (see ' +
-                    'examples at https://github.com/scality/S3/blob/' +
-                    'master/conf/authdata.json). Also note that support ' +
-                    'for account users has been dropped.',
-                { accountName, accountArn, filePath }
-            );
-            return false;
-        }
-        return true;
-    }
-
-    #isValidUsers(account: Account, filePath?: string) {
-        if (account.users) {
-            const { name: accountName, arn: accountArn } = account;
-            this.#log.error(
-                'support for account users has been dropped, consider ' +
-                    'turning users into account entries (see examples at ' +
-                    'https://github.com/scality/S3/blob/master/conf/' +
-                    'authdata.json)',
-                { accountName, accountArn, filePath }
-            );
-            return false;
-        }
-        return true;
-    }
-
-    #isValidARN(account: Account, filePath?: string) {
-        const arnObj = ARN.createFromString(account.arn);
-        const { name: accountName, arn: accountArn } = account;
-        if (arnObj instanceof ARN) {
-            if (!arnObj.isIAMAccount()) {
-                this.#log.error('authentication config validation error', {
-                    reason: 'not an IAM account ARN',
-                    accountName,
-                    accountArn,
-                    filePath,
-                });
-                return false;
-            }
-        } else {
-            this.#log.error('authentication config validation error', {
-                reason: arnObj.error.description,
-                accountName,
-                accountArn,
-                filePath,
-            });
-            return false;
-        }
-        return true;
-    }
-
-    #isAuthDataValid(authData: any, filePath?: string) {
-        const options = { abortEarly: true };
-        const response = types.validators.accounts.validate(authData, options);
-        if (response.error) {
-            this.#dumpJoiErrors(response.error.details, filePath);
-            return false;
-        }
-        const validAccounts = response.value.accounts.filter(
-            (account: Account) =>
-                this.#isNotLegacyAWSARN(account, filePath) &&
-                this.#isValidUsers(account, filePath) &&
-                this.#isValidARN(account, filePath)
-        );
-        const areSomeInvalidAccounts =
-            validAccounts.length !== response.value.accounts.length;
-        if (areSomeInvalidAccounts) {
-            return false;
-        }
-        const keys = validAccounts.flatMap((account) => account.keys);
-        const uniqueKeysValidator = types.validators.keys.unique('access');
-        const areKeysUnique = uniqueKeysValidator.validate(keys);
-        if (areKeysUnique.error) {
-            this.#dumpJoiErrors(areKeysUnique.error.details, filePath);
-            return false;
-        }
-        return true;
-    }
-
-    #dumpJoiErrors(errors: joi.ValidationErrorItem[], filePath?: string) {
-        errors.forEach((err) => {
-            const baseLogInfo = { item: err.path, filePath };
-            const logInfo = () => {
-                if (err.type === 'array.unique') {
-                    const reason = `duplicate value '${err.context?.path}'`;
-                    const dupValue = err.context?.value[err.context.path];
-                    return { ...baseLogInfo, reason, dupValue };
-                } else {
-                    const reason = err.message;
-                    const context = err.context;
-                    return { ...baseLogInfo, reason, context };
-                }
-            };
-            this.#log.error(
-                'authentication config validation error',
-                logInfo()
-            );
-        });
-    }
-}
--- a/lib/auth/backends/in_memory/Indexer.ts
+++ b/lib/auth/backends/in_memory/Indexer.ts
@ -1,93 +0,0 @@
-import { Accounts, Account, Entity } from './types';
-
-/**
- * Class that provides an internal indexing over the simple data provided by
- * the authentication configuration file for the memory backend. This allows
- * accessing the different authentication entities through various types of
- * keys.
- */
-export default class Indexer {
-    accountsBy: {
-        canId: { [id: string]: Entity | undefined },
-        accessKey: { [id: string]: Entity | undefined },
-        email: { [id: string]: Entity | undefined },
-    }
-
-    constructor(authdata?: Accounts) {
-        this.accountsBy = {
-            canId: {},
-            accessKey: {},
-            email: {},
-        };
-
-        /*
-         * This may happen if the application is configured to use another
-         * authentication backend than in-memory.
-         * As such, we're managing the error here to avoid screwing up there.
-         */
-        if (!authdata) {
-            return;
-        }
-
-        this.#build(authdata);
-    }
-
-    #indexAccount(account: Account) {
-        const accountData: Entity = {
-            arn: account.arn,
-            canonicalID: account.canonicalID,
-            shortid: account.shortid,
-            accountDisplayName: account.name,
-            email: account.email.toLowerCase(),
-            keys: [],
-        };
-        this.accountsBy.canId[accountData.canonicalID] = accountData;
-        this.accountsBy.email[accountData.email] = accountData;
-        if (account.keys !== undefined) {
-            account.keys.forEach(key => {
-                accountData.keys.push(key);
-                this.accountsBy.accessKey[key.access] = accountData;
-            });
-        }
-    }
-
-    #build(authdata: Accounts) {
-        authdata.accounts.forEach(account => {
-            this.#indexAccount(account);
-        });
-    }
-
-    /** This method returns the account associated to a canonical ID. */
-    getEntityByCanId(canId: string): Entity | undefined {
-        return this.accountsBy.canId[canId];
-    }
-
-    /**
-     * This method returns the entity (either an account or a user) associated
-     * to a canonical ID.
-     * @param {string} key - The accessKey of the entity
-     */
-    getEntityByKey(key: string): Entity | undefined {
-        return this.accountsBy.accessKey[key];
-    }
-
-    /**
-     * This method returns the entity (either an account or a user) associated
-     * to an email address.
-     */
-    getEntityByEmail(email: string): Entity | undefined {
-        const lowerCasedEmail = email.toLowerCase();
-        return this.accountsBy.email[lowerCasedEmail];
-    }
-
-    /** This method returns the secret key associated with the entity. */
-    getSecretKey(entity: Entity, accessKey: string) {
-        const keys = entity.keys.filter(kv => kv.access === accessKey);
-        return keys[0].secret;
-    }
-
-    /** This method returns the account display name associated with the entity. */
-    getAcctDisplayName(entity: Entity) {
-        return entity.accountDisplayName;
-    }
-}
--- a/lib/auth/backends/in_memory/types.ts
+++ b/lib/auth/backends/in_memory/types.ts
@ -1,51 +0,0 @@
-import joi from 'joi';
-
-export type Callback<Data = any> = (err?: Error | null | undefined, data?: Data) => void;
-
-export type Credentials = { access: string; secret: string };
-export type Base = {
-    arn: string;
-    canonicalID: string;
-    shortid: string;
-    email: string;
-    keys: Credentials[];
-};
-export type Account = Base & { name: string; users: any[] };
-export type Accounts = { accounts: Account[] };
-export type Entity = Base & { accountDisplayName: string };
-
-const keys = ((): joi.ArraySchema => {
-    const str = joi.string().required();
-    const items = { access: str, secret: str };
-    return joi.array().items(items).required();
-})();
-
-const account = (() => {
-    return joi.object<Account>({
-        name: joi.string().required(),
-        email: joi.string().email().required(),
-        arn: joi.string().required(),
-        canonicalID: joi.string().required(),
-        shortid: joi
-            .string()
-            .regex(/^[0-9]{12}$/)
-            .required(),
-        keys: keys,
-        // backward-compat
-        users: joi.array(),
-    });
-})();
-
-const accounts = (() => {
-    return joi.object<Accounts>({
-        accounts: joi
-            .array()
-            .items(account)
-            .required()
-            .unique('arn')
-            .unique('email')
-            .unique('canonicalID'),
-    });
-})();
-
-export const validators = { keys, account, accounts };
--- a/lib/auth/backends/in_memory/validateAuthConfig.ts
+++ b/lib/auth/backends/in_memory/validateAuthConfig.ts
@ -1,16 +0,0 @@
-import { Logger } from 'werelogs';
-import AuthLoader from './AuthLoader';
-import { Accounts } from './types';
-
-/**
- * @deprecated please use {@link AuthLoader} class instead
- * @return true on erroneous data false on success
- */
-export default function validateAuthConfig(
-    authdata: Accounts,
-    logApi?: { Logger: typeof Logger }
-) {
-    const authLoader = new AuthLoader(logApi);
-    authLoader.addAccounts(authdata);
-    return !authLoader.validate();
-}
--- a/lib/auth/in_memory/AuthLoader.js
+++ b/lib/auth/in_memory/AuthLoader.js
@ -0,0 +1,223 @@
+const fs = require('fs');
+const glob = require('simple-glob');
+const joi = require('@hapi/joi');
+const werelogs = require('werelogs');
+
+const ARN = require('../../models/ARN');
+
+/**
+ * Load authentication information from files or pre-loaded account
+ * objects
+ *
+ * @class AuthLoader
+ */
+class AuthLoader {
+    constructor(logApi) {
+        this._log = new (logApi || werelogs).Logger('S3');
+        this._authData = { accounts: [] };
+        // null: unknown validity, true/false: valid or invalid
+        this._isValid = null;
+
+        this._joiKeysValidator = joi.array()
+            .items({
+                access: joi.string().required(),
+                secret: joi.string().required(),
+            })
+            .required();
+
+        const accountsJoi = joi.array()
+                .items({
+                    name: joi.string().required(),
+                    email: joi.string().email().required(),
+                    arn: joi.string().required(),
+                    canonicalID: joi.string().required(),
+                    shortid: joi.string().regex(/^[0-9]{12}$/).required(),
+                    keys: this._joiKeysValidator,
+                    // backward-compat
+                    users: joi.array(),
+                })
+                .required()
+                .unique('arn')
+                .unique('email')
+                .unique('canonicalID');
+        this._joiValidator = joi.object({ accounts: accountsJoi });
+    }
+
+    /**
+     * add one or more accounts to the authentication info
+     *
+     * @param {object} authData - authentication data
+     * @param {object[]} authData.accounts - array of account data
+     * @param {string} authData.accounts[].name - account name
+     * @param {string} authData.accounts[].email: email address
+     * @param {string} authData.accounts[].arn: account ARN,
+     *   e.g. 'arn:aws:iam::123456789012:root'
+     * @param {string} authData.accounts[].canonicalID account
+     *   canonical ID
+     * @param {string} authData.accounts[].shortid account ID number,
+     *   e.g. '123456789012'
+     * @param {object[]} authData.accounts[].keys array of
+     *   access/secret keys
+     * @param {object[]} authData.accounts[].keys[].access access key
+     * @param {object[]} authData.accounts[].keys[].secret secret key
+     * @param {string} [filePath] - optional file path info for
+     *   logging purpose
+     * @return {undefined}
+     */
+    addAccounts(authData, filePath) {
+        const isValid = this._validateData(authData, filePath);
+        if (isValid) {
+            this._authData.accounts =
+                this._authData.accounts.concat(authData.accounts);
+            // defer validity checking when getting data to avoid
+            // logging multiple times the errors (we need to validate
+            // all accounts at once to detect duplicate values)
+            if (this._isValid) {
+                this._isValid = null;
+            }
+        } else {
+            this._isValid = false;
+        }
+    }
+
+    /**
+     * add account information from a file
+     *
+     * @param {string} filePath - file path containing JSON
+     *   authentication info (see {@link addAccounts()} for format)
+     * @return {undefined}
+     */
+    addFile(filePath) {
+        const authData = JSON.parse(fs.readFileSync(filePath));
+        this.addAccounts(authData, filePath);
+    }
+
+    /**
+     * add account information from a filesystem path
+     *
+     * @param {string|string[]} globPattern - filesystem glob pattern,
+     *   can be a single string or an array of glob patterns. Globs
+     *   can be simple file paths or can contain glob matching
+     *   characters, like '/a/b/*.json'. The matching files are
+     *   individually loaded as JSON and accounts are added. See
+     *   {@link addAccounts()} for JSON format.
+     * @return {undefined}
+     */
+    addFilesByGlob(globPattern) {
+        const files = glob(globPattern);
+        files.forEach(filePath => this.addFile(filePath));
+    }
+
+    /**
+     * perform validation on authentication info previously
+     * loaded. Note that it has to be done on the entire set after an
+     * update to catch duplicate account IDs or access keys.
+     *
+     * @return {boolean} true if authentication info is valid
+     *                   false otherwise
+     */
+    validate() {
+        if (this._isValid === null) {
+            this._isValid = this._validateData(this._authData);
+        }
+        return this._isValid;
+    }
+
+    /**
+     * get authentication info as a plain JS object containing all accounts
+     * under the "accounts" attribute, with validation.
+     *
+     * @return {object|null} the validated authentication data
+     *                       null if invalid
+     */
+    getData() {
+        return this.validate() ? this._authData : null;
+    }
+
+    _validateData(authData, filePath) {
+        const res = joi.validate(authData, this._joiValidator,
+                                 { abortEarly: false });
+        if (res.error) {
+            this._dumpJoiErrors(res.error.details, filePath);
+            return false;
+        }
+        let allKeys = [];
+        let arnError = false;
+        const validatedAuth = res.value;
+        validatedAuth.accounts.forEach(account => {
+            // backward-compat: ignore arn if starts with 'aws:' and log a
+            // warning
+            if (account.arn.startsWith('aws:')) {
+                this._log.error(
+                    'account must have a valid AWS ARN, legacy examples ' +
+                        'starting with \'aws:\' are not supported anymore. ' +
+                        'Please convert to a proper account entry (see ' +
+                        'examples at https://github.com/scality/S3/blob/' +
+                        'master/conf/authdata.json). Also note that support ' +
+                        'for account users has been dropped.',
+                    { accountName: account.name, accountArn: account.arn,
+                      filePath });
+                arnError = true;
+                return;
+            }
+            if (account.users) {
+                this._log.error(
+                    'support for account users has been dropped, consider ' +
+                        'turning users into account entries (see examples at ' +
+                        'https://github.com/scality/S3/blob/master/conf/' +
+                        'authdata.json)',
+                    { accountName: account.name, accountArn: account.arn,
+                      filePath });
+                arnError = true;
+                return;
+            }
+            const arnObj = ARN.createFromString(account.arn);
+            if (arnObj.error) {
+                this._log.error(
+                    'authentication config validation error',
+                    { reason: arnObj.error.description,
+                      accountName: account.name, accountArn: account.arn,
+                      filePath });
+                arnError = true;
+                return;
+            }
+            if (!arnObj.isIAMAccount()) {
+                this._log.error(
+                    'authentication config validation error',
+                    { reason: 'not an IAM account ARN',
+                      accountName: account.name, accountArn: account.arn,
+                      filePath });
+                arnError = true;
+                return;
+            }
+            allKeys = allKeys.concat(account.keys);
+        });
+        if (arnError) {
+            return false;
+        }
+        const uniqueKeysRes = joi.validate(
+            allKeys, this._joiKeysValidator.unique('access'));
+        if (uniqueKeysRes.error) {
+            this._dumpJoiErrors(uniqueKeysRes.error.details, filePath);
+            return false;
+        }
+        return true;
+    }
+
+    _dumpJoiErrors(errors, filePath) {
+        errors.forEach(err => {
+            const logInfo = { item: err.path, filePath };
+            if (err.type === 'array.unique') {
+                logInfo.reason = `duplicate value '${err.context.path}'`;
+                logInfo.dupValue = err.context.value[err.context.path];
+            } else {
+                logInfo.reason = err.message;
+                logInfo.context = err.context;
+            }
+            this._log.error('authentication config validation error',
+                            logInfo);
+        });
+    }
+}
+
+module.exports = AuthLoader;
--- a/lib/auth/backends/in_memory/Backend.ts
+++ b/lib/auth/backends/in_memory/Backend.ts
@ -1,12 +1,13 @@
-import crypto from 'crypto';
-import { Logger } from 'werelogs';
-import errors from '../../../errors';
-import { calculateSigningKey, hashSignature } from './vaultUtilities';
-import Indexer from './Indexer';
-import BaseBackend from '../base';
-import { Accounts } from './types';
+'use strict'; // eslint-disable-line strict

-function _formatResponse(userInfoToSend: any) {
+const crypto = require('crypto');
+
+const errors = require('../../errors').default;
+const calculateSigningKey = require('./vaultUtilities').calculateSigningKey;
+const hashSignature = require('./vaultUtilities').hashSignature;
+const Indexer = require('./Indexer');
+
+function _formatResponse(userInfoToSend) {
    return {
        message: {
            body: { userInfo: userInfoToSend },
@ -18,32 +19,32 @@ function _formatResponse(userInfoToSend: any) {
 * Class that provides a memory backend for verifying signatures and getting
 * emails and canonical ids associated with an account.
 *
- * @class InMemoryBackend
+ * @class Backend
 */
-class InMemoryBackend extends BaseBackend {
-    indexer: Indexer;
-    formatResponse: any;
-
+class Backend {
    /**
     * @constructor
-     * @param service - service identifer for construction arn
-     * @param indexer - indexer instance for retrieving account info
-     * @param formatter - function which accepts user info to send
+     * @param {string} service - service identifer for construction arn
+     * @param {Indexer} indexer - indexer instance for retrieving account info
+     * @param {function} formatter - function which accepts user info to send
     * back and returns it in an object
     */
-    constructor(service: string, indexer: Indexer, formatter: typeof _formatResponse) {
-        super(service);
+    constructor(service, indexer, formatter) {
+        this.service = service;
        this.indexer = indexer;
        this.formatResponse = formatter;
    }

-    verifySignatureV2(
-        stringToSign: string,
-        signatureFromRequest: string,
-        accessKey: string,
-        options: any,
-        callback: any,
-    ) {
+    /** verifySignatureV2
+    * @param {string} stringToSign - string to sign built per AWS rules
+    * @param {string} signatureFromRequest - signature sent with request
+    * @param {string} accessKey - account accessKey
+    * @param {object} options - contains algorithm (SHA1 or SHA256)
+    * @param {function} callback - callback with either error or user info
+    * @return {function} calls callback
+    */
+    verifySignatureV2(stringToSign, signatureFromRequest,
+        accessKey, options, callback) {
        const entity = this.indexer.getEntityByKey(accessKey);
        if (!entity) {
            return callback(errors.InvalidAccessKeyId);
@ -58,22 +59,26 @@ class InMemoryBackend extends BaseBackend {
            accountDisplayName: this.indexer.getAcctDisplayName(entity),
            canonicalID: entity.canonicalID,
            arn: entity.arn,
-            // @ts-ignore
            IAMdisplayName: entity.IAMdisplayName,
        };
        const vaultReturnObject = this.formatResponse(userInfoToSend);
        return callback(null, vaultReturnObject);
    }

-    verifySignatureV4(
-        stringToSign: string,
-        signatureFromRequest: string,
-        accessKey: string,
-        region: string,
-        scopeDate: string,
-        options: any,
-        callback: any,
-    ) {
+
+    /** verifySignatureV4
+     * @param {string} stringToSign - string to sign built per AWS rules
+     * @param {string} signatureFromRequest - signature sent with request
+     * @param {string} accessKey - account accessKey
+     * @param {string} region - region specified in request credential
+     * @param {string} scopeDate - date specified in request credential
+     * @param {object} options - options to send to Vault
+     * (just contains reqUid for logging in Vault)
+     * @param {function} callback - callback with either error or user info
+     * @return {function} calls callback
+     */
+    verifySignatureV4(stringToSign, signatureFromRequest, accessKey,
+        region, scopeDate, options, callback) {
        const entity = this.indexer.getEntityByKey(accessKey);
        if (!entity) {
            return callback(errors.InvalidAccessKeyId);
@ -89,14 +94,23 @@ class InMemoryBackend extends BaseBackend {
            accountDisplayName: this.indexer.getAcctDisplayName(entity),
            canonicalID: entity.canonicalID,
            arn: entity.arn,
-            // @ts-ignore
            IAMdisplayName: entity.IAMdisplayName,
        };
        const vaultReturnObject = this.formatResponse(userInfoToSend);
        return callback(null, vaultReturnObject);
    }

-    getCanonicalIds(emails: string[], log: Logger, cb: any) {
+    /**
+     * Gets canonical ID's for a list of accounts
+     * based on email associated with account
+     * @param {array} emails - list of email addresses
+     * @param {object} log - log object
+     * @param {function} cb - callback to calling function
+     * @returns {function} callback with either error or
+     * object with email addresses as keys and canonical IDs
+     * as values
+     */
+    getCanonicalIds(emails, log, cb) {
        const results = {};
        emails.forEach(email => {
            const lowercasedEmail = email.toLowerCase();
@ -116,7 +130,17 @@ class InMemoryBackend extends BaseBackend {
        return cb(null, vaultReturnObject);
    }

-    getEmailAddresses(canonicalIDs: string[], options: any, cb: any) {
+    /**
+     * Gets email addresses (referred to as diplay names for getACL's)
+     * for a list of accounts based on canonical IDs associated with account
+     * @param {array} canonicalIDs - list of canonicalIDs
+     * @param {object} options - to send log id to vault
+     * @param {function} cb - callback to calling function
+     * @returns {function} callback with either error or
+     * an object from Vault containing account canonicalID
+     * as each object key and an email address as the value (or "NotFound")
+     */
+    getEmailAddresses(canonicalIDs, options, cb) {
        const results = {};
        canonicalIDs.forEach(canonicalId => {
            const foundEntity = this.indexer.getEntityByCanId(canonicalId);
@ -137,14 +161,14 @@ class InMemoryBackend extends BaseBackend {
    /**
     * Gets accountIds for a list of accounts based on
     * the canonical IDs associated with the account
-     * @param canonicalIDs - list of canonicalIDs
-     * @param options - to send log id to vault
-     * @param cb - callback to calling function
-     * @returns callback with either error or
+     * @param {array} canonicalIDs - list of canonicalIDs
+     * @param {object} options - to send log id to vault
+     * @param {function} cb - callback to calling function
+     * @returns {function} callback with either error or
     * an object from Vault containing account canonicalID
     * as each object key and an accountId as the value (or "NotFound")
     */
-    getAccountIds(canonicalIDs: string[], options: any, cb: any) {
+    getAccountIds(canonicalIDs, options, cb) {
        const results = {};
        canonicalIDs.forEach(canonicalID => {
            const foundEntity = this.indexer.getEntityByCanId(canonicalID);
@ -161,34 +185,33 @@ class InMemoryBackend extends BaseBackend {
        };
        return cb(null, vaultReturnObject);
    }
-
-    report(log: Logger, callback: any) {
-        return callback(null, {});
-    }
 }


-class S3AuthBackend extends InMemoryBackend {
+class S3AuthBackend extends Backend {
    /**
     * @constructor
-     * @param authdata - the authentication config file's data
-     * @param authdata.accounts - array of account objects
-     * @param authdata.accounts[].name - account name
-     * @param authdata.accounts[].email - account email
-     * @param authdata.accounts[].arn - IAM resource name
-     * @param authdata.accounts[].canonicalID - account canonical ID
-     * @param authdata.accounts[].shortid - short account ID
-     * @param authdata.accounts[].keys - array of key objects
-     * @param authdata.accounts[].keys[].access - access key
-     * @param authdata.accounts[].keys[].secret - secret key
+     * @param {object} authdata - the authentication config file's data
+     * @param {object[]} authdata.accounts - array of account objects
+     * @param {string=} authdata.accounts[].name - account name
+     * @param {string} authdata.accounts[].email - account email
+     * @param {string} authdata.accounts[].arn - IAM resource name
+     * @param {string} authdata.accounts[].canonicalID - account canonical ID
+     * @param {string} authdata.accounts[].shortid - short account ID
+     * @param {object[]=} authdata.accounts[].keys - array of key objects
+     * @param {string} authdata.accounts[].keys[].access - access key
+     * @param {string} authdata.accounts[].keys[].secret - secret key
+     * @return {undefined}
     */
-    constructor(authdata?: Accounts) {
+    constructor(authdata) {
        super('s3', new Indexer(authdata), _formatResponse);
    }

-    refreshAuthData(authData?: Accounts) {
+    refreshAuthData(authData) {
        this.indexer = new Indexer(authData);
    }
 }

-export { S3AuthBackend as s3 }
+module.exports = {
+    s3: S3AuthBackend,
+};
--- a/lib/auth/in_memory/Indexer.js
+++ b/lib/auth/in_memory/Indexer.js
@ -0,0 +1,145 @@
+/**
+ * Class that provides an internal indexing over the simple data provided by
+ * the authentication configuration file for the memory backend. This allows
+ * accessing the different authentication entities through various types of
+ * keys.
+ *
+ * @class Indexer
+ */
+class Indexer {
+    /**
+     * @constructor
+     * @param {object} authdata - the authentication config file's data
+     * @param {object[]} authdata.accounts - array of account objects
+     * @param {string=} authdata.accounts[].name - account name
+     * @param {string} authdata.accounts[].email - account email
+     * @param {string} authdata.accounts[].arn - IAM resource name
+     * @param {string} authdata.accounts[].canonicalID - account canonical ID
+     * @param {string} authdata.accounts[].shortid - short account ID
+     * @param {object[]=} authdata.accounts[].keys - array of key objects
+     * @param {string} authdata.accounts[].keys[].access - access key
+     * @param {string} authdata.accounts[].keys[].secret - secret key
+     * @return {undefined}
+     */
+    constructor(authdata) {
+        this.accountsBy = {
+            canId: {},
+            accessKey: {},
+            email: {},
+        };
+
+        /*
+         * This may happen if the application is configured to use another
+         * authentication backend than in-memory.
+         * As such, we're managing the error here to avoid screwing up there.
+         */
+        if (!authdata) {
+            return;
+        }
+
+        this._build(authdata);
+    }
+
+    _indexAccount(account) {
+        const accountData = {
+            arn: account.arn,
+            canonicalID: account.canonicalID,
+            shortid: account.shortid,
+            accountDisplayName: account.name,
+            email: account.email.toLowerCase(),
+            keys: [],
+        };
+        this.accountsBy.canId[accountData.canonicalID] = accountData;
+        this.accountsBy.email[accountData.email] = accountData;
+        if (account.keys !== undefined) {
+            account.keys.forEach(key => {
+                accountData.keys.push(key);
+                this.accountsBy.accessKey[key.access] = accountData;
+            });
+        }
+    }
+
+    _build(authdata) {
+        authdata.accounts.forEach(account => {
+            this._indexAccount(account);
+        });
+    }
+
+    /**
+     * This method returns the account associated to a canonical ID.
+     *
+     * @param {string} canId - The canonicalId of the account
+     * @return {Object} account - The account object
+     * @return {Object} account.arn - The account's ARN
+     * @return {Object} account.canonicalID - The account's canonical ID
+     * @return {Object} account.shortid - The account's internal shortid
+     * @return {Object} account.accountDisplayName - The account's display name
+     * @return {Object} account.email - The account's lowercased email
+     */
+    getEntityByCanId(canId) {
+        return this.accountsBy.canId[canId];
+    }
+
+    /**
+     * This method returns the entity (either an account or a user) associated
+     * to a canonical ID.
+     *
+     * @param {string} key - The accessKey of the entity
+     * @return {Object} entity - The entity object
+     * @return {Object} entity.arn - The entity's ARN
+     * @return {Object} entity.canonicalID - The canonical ID for the entity's
+     *                                       account
+     * @return {Object} entity.shortid - The entity's internal shortid
+     * @return {Object} entity.accountDisplayName - The entity's account
+     *                                              display name
+     * @return {Object} entity.IAMDisplayName - The user's display name
+     *                                          (if the entity is an user)
+     * @return {Object} entity.email - The entity's lowercased email
+     */
+    getEntityByKey(key) {
+        return this.accountsBy.accessKey[key];
+    }
+
+    /**
+     * This method returns the entity (either an account or a user) associated
+     * to an email address.
+     *
+     * @param {string} email - The email address
+     * @return {Object} entity - The entity object
+     * @return {Object} entity.arn - The entity's ARN
+     * @return {Object} entity.canonicalID - The canonical ID for the entity's
+     *                                       account
+     * @return {Object} entity.shortid - The entity's internal shortid
+     * @return {Object} entity.accountDisplayName - The entity's account
+     *                                              display name
+     * @return {Object} entity.IAMDisplayName - The user's display name
+     *                                          (if the entity is an user)
+     * @return {Object} entity.email - The entity's lowercased email
+     */
+    getEntityByEmail(email) {
+        const lowerCasedEmail = email.toLowerCase();
+        return this.accountsBy.email[lowerCasedEmail];
+    }
+
+    /**
+    * This method returns the secret key associated with the entity.
+    * @param {Object} entity - the entity object
+    * @param {string} accessKey - access key
+    * @returns {string} secret key
+    */
+    getSecretKey(entity, accessKey) {
+        return entity.keys
+            .filter(kv => kv.access === accessKey)[0].secret;
+    }
+
+    /**
+    * This method returns the account display name associated with the entity.
+    * @param {Object} entity - the entity object
+    * @returns {string} account display name
+    */
+    getAcctDisplayName(entity) {
+        return entity.accountDisplayName;
+    }
+}
+
+module.exports = Indexer;
--- a/lib/auth/in_memory/validateAuthConfig.js
+++ b/lib/auth/in_memory/validateAuthConfig.js
@ -0,0 +1,18 @@
+const AuthLoader = require('./AuthLoader');
+
+/**
+ * @deprecated please use {@link AuthLoader} class instead
+ *
+ * @param {object} authdata - the authentication config file's data
+ * @param {werelogs.API} logApi - object providing a constructor function
+ *                                for the Logger object
+ * @return {boolean} true on erroneous data
+ *                   false on success
+ */
+function validateAuthConfig(authdata, logApi) {
+    const authLoader = new AuthLoader(logApi);
+    authLoader.addAccounts(authdata);
+    return !authLoader.validate();
+}
+
+module.exports = validateAuthConfig;
--- a/lib/auth/backends/in_memory/vaultUtilities.ts
+++ b/lib/auth/backends/in_memory/vaultUtilities.ts
@ -1,4 +1,6 @@
-import * as crypto from 'crypto';
+'use strict'; // eslint-disable-line strict
+
+const crypto = require('crypto');

 /** hashSignature for v2 Auth
 * @param {string} stringToSign - built string to sign per AWS rules
@ -6,19 +8,11 @@ import * as crypto from 'crypto';
 * @param {string} algorithm - either SHA256 or SHA1
 * @return {string} reconstructed signature
 */
-export function hashSignature(
-    stringToSign: string,
-    secretKey: string,
-    algorithm: 'SHA256' | 'SHA1'
-): string {
+function hashSignature(stringToSign, secretKey, algorithm) {
    const hmacObject = crypto.createHmac(algorithm, secretKey);
    return hmacObject.update(stringToSign, 'binary').digest('base64');
 }

-const sha256Digest = (key: string | Buffer, data: string) => {
-    return crypto.createHmac('sha256', key).update(data, 'binary').digest();
-};
-
 /** calculateSigningKey for v4 Auth
 * @param {string} secretKey - requester's secretKey
 * @param {string} region - region included in request
@ -26,15 +20,16 @@ const sha256Digest = (key: string | Buffer, data: string) => {
 * @param {string} [service] - To specify another service than s3
 * @return {string} signingKey - signingKey to calculate signature
 */
-export function calculateSigningKey(
-    secretKey: string,
-    region: string,
-    scopeDate: string,
-    service?: string
-): Buffer {
-    const dateKey = sha256Digest(`AWS4${secretKey}`, scopeDate);
-    const dateRegionKey = sha256Digest(dateKey, region);
-    const dateRegionServiceKey = sha256Digest(dateRegionKey, service || 's3');
-    const signingKey = sha256Digest(dateRegionServiceKey, 'aws4_request');
+function calculateSigningKey(secretKey, region, scopeDate, service) {
+    const dateKey = crypto.createHmac('sha256', `AWS4${secretKey}`)
+        .update(scopeDate, 'binary').digest();
+    const dateRegionKey = crypto.createHmac('sha256', dateKey)
+        .update(region, 'binary').digest();
+    const dateRegionServiceKey = crypto.createHmac('sha256', dateRegionKey)
+        .update(service || 's3', 'binary').digest();
+    const signingKey = crypto.createHmac('sha256', dateRegionServiceKey)
+        .update('aws4_request', 'binary').digest();
    return signingKey;
 }
+
+module.exports = { hashSignature, calculateSigningKey };
--- a/lib/auth/v2/algoCheck.js
+++ b/lib/auth/v2/algoCheck.js
@ -1,5 +1,7 @@
-export default function algoCheck(signatureLength: number) {
-    let algo: 'sha256' | 'sha1';
+'use strict'; // eslint-disable-line strict
+
+function algoCheck(signatureLength) {
+    let algo;
    // If the signature sent is 44 characters,
    // this means that sha256 was used:
    // 44 characters in base64
@ -11,6 +13,7 @@ export default function algoCheck(signatureLength: number) {
    if (signatureLength === SHA1LEN) {
        algo = 'sha1';
    }
-    // @ts-ignore
    return algo;
 }
+
+module.exports = algoCheck;
--- a/lib/auth/v2/authV2.js
+++ b/lib/auth/v2/authV2.js
@ -0,0 +1,11 @@
+'use strict'; // eslint-disable-line strict
+
+const headerAuthCheck = require('./headerAuthCheck');
+const queryAuthCheck = require('./queryAuthCheck');
+
+const authV2 = {
+    header: headerAuthCheck,
+    query: queryAuthCheck,
+};
+
+module.exports = authV2;
--- a/lib/auth/v2/authV2.ts
+++ b/lib/auth/v2/authV2.ts
@ -1,2 +0,0 @@
-export * as header from './headerAuthCheck';
-export * as query from './queryAuthCheck';
--- a/lib/auth/v2/checkRequestExpiry.js
+++ b/lib/auth/v2/checkRequestExpiry.js
@ -1,9 +1,9 @@
-import { Logger } from 'werelogs';
-import errors from '../../errors';
+'use strict'; // eslint-disable-line strict
+const errors = require('../../errors').default;

 const epochTime = new Date('1970-01-01').getTime();

-export default function checkRequestExpiry(timestamp: number, log: Logger) {
+function checkRequestExpiry(timestamp, log) {
    // If timestamp is before epochTime, the request is invalid and return
    // errors.AccessDenied
    if (timestamp < epochTime) {
@ -32,3 +32,5 @@ export default function checkRequestExpiry(timestamp: number, log: Logger) {

    return undefined;
 }
+
+module.exports = checkRequestExpiry;
--- a/lib/auth/v2/constructStringToSign.js
+++ b/lib/auth/v2/constructStringToSign.js
@ -1,14 +1,11 @@
-import { Logger } from 'werelogs';
-import utf8 from 'utf8';
-import getCanonicalizedAmzHeaders from './getCanonicalizedAmzHeaders';
-import getCanonicalizedResource from './getCanonicalizedResource';
+'use strict'; // eslint-disable-line strict

-export default function constructStringToSign(
-    request: any,
-    data: { [key: string]: string },
-    log: Logger,
-    clientType?: any
-) {
+const utf8 = require('utf8');
+
+const getCanonicalizedAmzHeaders = require('./getCanonicalizedAmzHeaders');
+const getCanonicalizedResource = require('./getCanonicalizedResource');
+
+function constructStringToSign(request, data, log, clientType) {
    /*
    Build signature per AWS requirements:
    StringToSign = HTTP-Verb + '\n' +
@ -45,3 +42,5 @@ export default function constructStringToSign(
        + getCanonicalizedResource(request, clientType);
    return utf8.encode(stringToSign);
 }
+
+module.exports = constructStringToSign;
--- a/lib/auth/v2/getCanonicalizedAmzHeaders.js
+++ b/lib/auth/v2/getCanonicalizedAmzHeaders.js
@ -1,12 +1,14 @@
-export default function getCanonicalizedAmzHeaders(headers: Headers, clientType: string) {
+'use strict'; // eslint-disable-line strict
+
+function getCanonicalizedAmzHeaders(headers, clientType) {
    /*
    Iterate through headers and pull any headers that are x-amz headers.
    Need to include 'x-amz-date' here even though AWS docs
    ambiguous on this.
    */
    const filterFn = clientType === 'GCP' ?
-        (val: string) => val.substr(0, 7) === 'x-goog-' :
-        (val: string) => val.substr(0, 6) === 'x-amz-';
+        val => val.substr(0, 7) === 'x-goog-' :
+        val => val.substr(0, 6) === 'x-amz-';
    const amzHeaders = Object.keys(headers)
        .filter(filterFn)
        .map(val => [val.trim(), headers[val].trim()]);
@ -41,3 +43,5 @@ export default function getCanonicalizedAmzHeaders(headers: Headers, clientType:
        `${headerStr}${current[0]}:${current[1]}\n`,
        '');
 }
+
+module.exports = getCanonicalizedAmzHeaders;
--- a/lib/auth/v2/getCanonicalizedResource.js
+++ b/lib/auth/v2/getCanonicalizedResource.js
@ -1,4 +1,6 @@
-import * as url from 'url';
+'use strict'; // eslint-disable-line strict
+
+const url = require('url');

 const gcpSubresources = [
    'acl',
@ -39,7 +41,7 @@ const awsSubresources = [
    'website',
 ];

-export default function getCanonicalizedResource(request: any, clientType: string) {
+function getCanonicalizedResource(request, clientType) {
    /*
    This variable is used to determine whether to insert
    a '?' or '&'.  Once a query parameter is added to the resourceString,
@ -115,3 +117,5 @@ export default function getCanonicalizedResource(request: any, clientType: strin
    }
    return resourceString;
 }
+
+module.exports = getCanonicalizedResource;
--- a/lib/auth/v2/headerAuthCheck.js
+++ b/lib/auth/v2/headerAuthCheck.js
@ -1,11 +1,12 @@
-import { Logger } from 'werelogs';
-import errors from '../../errors';
-import * as constants from '../../constants';
-import constructStringToSign from './constructStringToSign';
-import checkRequestExpiry from './checkRequestExpiry';
-import algoCheck from './algoCheck';
+'use strict'; // eslint-disable-line strict

-export function check(request: any, log: Logger, data: { [key: string]: string }) {
+const errors = require('../../errors').default;
+const constants = require('../../constants');
+const constructStringToSign = require('./constructStringToSign');
+const checkRequestExpiry = require('./checkRequestExpiry');
+const algoCheck = require('./algoCheck');
+
+function check(request, log, data) {
    log.trace('running header auth check');
    const headers = request.headers;

@ -51,7 +52,6 @@ export function check(request: any, log: Logger, data: { [key: string]: string }
        log.trace('invalid authorization header', { authInfo });
        return { err: errors.MissingSecurityHeader };
    }
-    // @ts-ignore
    log.addDefaultFields({ accessKey });

    const signatureFromRequest = authInfo.substring(semicolonIndex + 1).trim();
@ -80,3 +80,5 @@ export function check(request: any, log: Logger, data: { [key: string]: string }
        },
    };
 }
+
+module.exports = { check };
--- a/lib/auth/v2/queryAuthCheck.js
+++ b/lib/auth/v2/queryAuthCheck.js
@ -1,10 +1,11 @@
-import { Logger } from 'werelogs';
-import errors from '../../errors';
-import * as constants from '../../constants';
-import algoCheck from './algoCheck';
-import constructStringToSign from './constructStringToSign';
+'use strict'; // eslint-disable-line strict

-export function check(request: any, log: Logger, data: { [key: string]: string }) {
+const errors = require('../../errors').default;
+const constants = require('../../constants');
+const algoCheck = require('./algoCheck');
+const constructStringToSign = require('./constructStringToSign');
+
+function check(request, log, data) {
    log.trace('running query auth check');
    if (request.method === 'POST') {
        log.debug('query string auth not supported for post requests');
@ -50,7 +51,6 @@ export function check(request: any, log: Logger, data: { [key: string]: string }
        return { err: errors.RequestTimeTooSkewed };
    }
    const accessKey = data.AWSAccessKeyId;
-    // @ts-ignore
    log.addDefaultFields({ accessKey });

    const signatureFromRequest = decodeURIComponent(data.Signature);
@ -82,3 +82,5 @@ export function check(request: any, log: Logger, data: { [key: string]: string }
        },
    };
 }
+
+module.exports = { check };
--- a/lib/auth/v4/authV4.js
+++ b/lib/auth/v4/authV4.js
@ -0,0 +1,11 @@
+'use strict'; // eslint-disable-line strict
+
+const headerAuthCheck = require('./headerAuthCheck');
+const queryAuthCheck = require('./queryAuthCheck');
+
+const authV4 = {
+    header: headerAuthCheck,
+    query: queryAuthCheck,
+};
+
+module.exports = authV4;
--- a/lib/auth/v4/authV4.ts
+++ b/lib/auth/v4/authV4.ts
@ -1,2 +0,0 @@
-export * as header from './headerAuthCheck';
-export * as query from './queryAuthCheck';
--- a/lib/auth/v4/awsURIencode.js
+++ b/lib/auth/v4/awsURIencode.js
@ -1,3 +1,5 @@
+'use strict'; // eslint-disable-line strict
+
 /*
 AWS's URI encoding rules:
 URI encode every byte. Uri-Encode() must enforce the following rules:
@ -17,7 +19,7 @@ See http://docs.aws.amazon.com/AmazonS3/latest/API/sig-v4-header-based-auth.html
 */

 // converts utf8 character to hex and pads "%" before every two hex digits
-function _toHexUTF8(char: string) {
+function _toHexUTF8(char) {
    const hexRep = Buffer.from(char, 'utf8').toString('hex').toUpperCase();
    let res = '';
    hexRep.split('').forEach((v, n) => {
@ -30,23 +32,18 @@ function _toHexUTF8(char: string) {
    return res;
 }

-export default function awsURIencode(
-    input: string,
-    encodeSlash?: boolean,
-    noEncodeStar?: boolean
-) {
+function awsURIencode(input, encodeSlash, noEncodeStar) {
+    const encSlash = encodeSlash === undefined ? true : encodeSlash;
+    let encoded = '';
    /**
     * Duplicate query params are not suppported by AWS S3 APIs. These params
     * are parsed as Arrays by Node.js HTTP parser which breaks this method
    */
    if (typeof input !== 'string') {
-        return '';
+        return encoded;
    }
-    let encoded = "";
-    const slash = encodeSlash === undefined || encodeSlash ? '%2F' : '/';
-    const star = noEncodeStar !== undefined && noEncodeStar ? '*' : '%2A';
    for (let i = 0; i < input.length; i++) {
-        let ch = input.charAt(i);
+        const ch = input.charAt(i);
        if ((ch >= 'A' && ch <= 'Z') ||
            (ch >= 'a' && ch <= 'z') ||
            (ch >= '0' && ch <= '9') ||
@ -56,26 +53,14 @@ export default function awsURIencode(
        } else if (ch === ' ') {
            encoded = encoded.concat('%20');
        } else if (ch === '/') {
-            encoded = encoded.concat(slash);
+            encoded = encoded.concat(encSlash ? '%2F' : ch);
        } else if (ch === '*') {
-            encoded = encoded.concat(star);
+            encoded = encoded.concat(noEncodeStar ? '*' : '%2A');
        } else {
-            if (ch >= '\uD800' && ch <= '\uDBFF') {
-                // If this character is a high surrogate peek the next character
-                // and join it with this one if the next character is a low
-                // surrogate.
-                // Otherwise the encoded URI will contain the two surrogates as
-                // two distinct UTF-8 sequences which is not valid UTF-8.
-                if (i + 1 < input.length) {
-                    const ch2 = input.charAt(i + 1);
-                    if (ch2 >= '\uDC00' && ch2 <= '\uDFFF') {
-                        i++;
-                        ch += ch2;
-                    }
-                }
-            }
            encoded = encoded.concat(_toHexUTF8(ch));
        }
    }
    return encoded;
 }
+
+module.exports = awsURIencode;
--- a/lib/auth/v4/constructStringToSign.js
+++ b/lib/auth/v4/constructStringToSign.js
@ -1,33 +1,17 @@
-import * as crypto from 'crypto';
-import { Logger } from 'werelogs';
-import createCanonicalRequest from './createCanonicalRequest';
+'use strict'; // eslint-disable-line strict
+
+const crypto = require('crypto');
+
+const createCanonicalRequest = require('./createCanonicalRequest');

 /**
 * constructStringToSign - creates V4 stringToSign
 * @param {object} params - params object
 * @returns {string} - stringToSign
 */
-export default function constructStringToSign(params: {
-    request: any;
-    signedHeaders: any;
-    payloadChecksum: any;
-    credentialScope: string;
-    timestamp: string;
-    query: { [key: string]: string };
-    log?: Logger;
-    proxyPath?: string;
-    awsService: string;
-}): string | Error {
-    const {
-        request,
-        signedHeaders,
-        payloadChecksum,
-        credentialScope,
-        timestamp,
-        query,
-        log,
-        proxyPath,
-    } = params;
+function constructStringToSign(params) {
+    const { request, signedHeaders, payloadChecksum, credentialScope, timestamp,
+        query, log, proxyPath } = params;
    const path = proxyPath || request.path;

    const canonicalReqResult = createCanonicalRequest({
@ -40,8 +24,6 @@ export default function constructStringToSign(params: {
        service: params.awsService,
    });

-    // TODO Why that line?
-    // @ts-ignore
    if (canonicalReqResult instanceof Error) {
        if (log) {
            log.error('error creating canonicalRequest');
@ -58,3 +40,5 @@ export default function constructStringToSign(params: {
    `${credentialScope}\n${canonicalHex}`;
    return stringToSign;
 }
+
+module.exports = constructStringToSign;
--- a/lib/auth/v4/createCanonicalRequest.js
+++ b/lib/auth/v4/createCanonicalRequest.js
@ -1,33 +1,27 @@
-import * as crypto from 'crypto';
-import * as queryString from 'querystring';
-import awsURIencode from './awsURIencode';
+'use strict'; // eslint-disable-line strict
+
+const awsURIencode = require('./awsURIencode');
+const crypto = require('crypto');
+const queryString = require('querystring');

 /**
 * createCanonicalRequest - creates V4 canonical request
- * @param params - contains pHttpVerb (request type),
+ * @param {object} params - contains pHttpVerb (request type),
 * pResource (parsed from URL), pQuery (request query),
 * pHeaders (request headers), pSignedHeaders (signed headers from request),
 * payloadChecksum (from request)
- * @returns - canonicalRequest
+ * @returns {string} - canonicalRequest
 */
-export default function createCanonicalRequest(
-    params: {
-        pHttpVerb: string;
-        pResource: string;
-        pQuery: { [key: string]: string };
-        pHeaders: any;
-        pSignedHeaders: any;
-        service: string;
-        payloadChecksum: string;
-    }
-) {
+function createCanonicalRequest(params) {
    const pHttpVerb = params.pHttpVerb;
    const pResource = params.pResource;
    const pQuery = params.pQuery;
    const pHeaders = params.pHeaders;
    const pSignedHeaders = params.pSignedHeaders;
    const service = params.service;
+
    let payloadChecksum = params.payloadChecksum;
+
    if (!payloadChecksum) {
        if (pHttpVerb === 'GET') {
            payloadChecksum = 'e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b' +
@ -40,7 +34,7 @@ export default function createCanonicalRequest(
            if (/aws-sdk-java\/[0-9.]+/.test(pHeaders['user-agent'])) {
                notEncodeStar = true;
            }
-            let payload = queryString.stringify(pQuery, undefined, undefined, {
+            let payload = queryString.stringify(pQuery, null, null, {
                encodeURIComponent: input => awsURIencode(input, true,
                    notEncodeStar),
            });
@ -67,11 +61,11 @@ export default function createCanonicalRequest(

    // signed headers
    const signedHeadersList = pSignedHeaders.split(';');
-    signedHeadersList.sort((a: any, b: any) => a.localeCompare(b));
+    signedHeadersList.sort((a, b) => a.localeCompare(b));
    const signedHeaders = signedHeadersList.join(';');

    // canonical headers
-    const canonicalHeadersList = signedHeadersList.map((signedHeader: any) => {
+    const canonicalHeadersList = signedHeadersList.map(signedHeader => {
        if (pHeaders[signedHeader] !== undefined) {
            const trimmedHeader = pHeaders[signedHeader]
                .trim().replace(/\s+/g, ' ');
@ -93,3 +87,5 @@ export default function createCanonicalRequest(
        `${signedHeaders}\n${payloadChecksum}`;
    return canonicalRequest;
 }
+
+module.exports = createCanonicalRequest;
--- a/lib/auth/v4/headerAuthCheck.js
+++ b/lib/auth/v4/headerAuthCheck.js
@ -1,32 +1,27 @@
-import { Logger } from 'werelogs';
-import errors from '../../../lib/errors';
-import * as constants from '../../constants';
-import constructStringToSign from './constructStringToSign';
-import {
-    checkTimeSkew,
-    convertUTCtoISO8601,
-    convertAmzTimeToMs,
-} from './timeUtils';
-import {
-    extractAuthItems,
-    validateCredentials,
-    areSignedHeadersComplete,
-} from './validateInputs';
+'use strict'; // eslint-disable-line strict
+
+const errors = require('../../../lib/errors').default;
+const constants = require('../../constants');
+
+const constructStringToSign = require('./constructStringToSign');
+const checkTimeSkew = require('./timeUtils').checkTimeSkew;
+const convertUTCtoISO8601 = require('./timeUtils').convertUTCtoISO8601;
+const convertAmzTimeToMs = require('./timeUtils').convertAmzTimeToMs;
+const extractAuthItems = require('./validateInputs').extractAuthItems;
+const validateCredentials = require('./validateInputs').validateCredentials;
+const areSignedHeadersComplete =
+    require('./validateInputs').areSignedHeadersComplete;

 /**
 * V4 header auth check
- * @param request - HTTP request object
- * @param log - logging object
- * @param data - Parameters from queryString parsing or body of
+ * @param {object} request - HTTP request object
+ * @param {object} log - logging object
+ * @param {object} data - Parameters from queryString parsing or body of
 *      POST request
- * @param awsService - Aws service ('iam' or 's3')
+ * @param {string} awsService - Aws service ('iam' or 's3')
+ * @return {callback} calls callback
 */
-export function check(
-    request: any,
-    log: Logger,
-    data: { [key: string]: string },
-    awsService: string
-) {
+function check(request, log, data, awsService) {
    log.trace('running header auth check');

    const token = request.headers['x-amz-security-token'];
@ -67,16 +62,16 @@ export function check(

    log.trace('authorization header from request', { authHeader });

-    const signatureFromRequest = authHeaderItems.signatureFromRequest!;
-    const credentialsArr = authHeaderItems.credentialsArr!;
-    const signedHeaders = authHeaderItems.signedHeaders!;
+    const signatureFromRequest = authHeaderItems.signatureFromRequest;
+    const credentialsArr = authHeaderItems.credentialsArr;
+    const signedHeaders = authHeaderItems.signedHeaders;

    if (!areSignedHeadersComplete(signedHeaders, request.headers)) {
        log.debug('signedHeaders are incomplete', { signedHeaders });
        return { err: errors.AccessDenied };
    }

-    let timestamp: string | undefined;
+    let timestamp;
    // check request timestamp
    const xAmzDate = request.headers['x-amz-date'];
    if (xAmzDate) {
@ -132,17 +127,6 @@ export function check(
        return { err: errors.RequestTimeTooSkewed };
    }

-    let proxyPath: string | undefined;
-    if (request.headers.proxy_path) {
-        try {
-            proxyPath = decodeURIComponent(request.headers.proxy_path);
-        } catch (err) {
-            log.debug('invalid proxy_path header', { proxyPath, err });
-            return { err: errors.InvalidArgument.customizeDescription(
-                'invalid proxy_path header') };
-        }
-    }
-
    const stringToSign = constructStringToSign({
        log,
        request,
@ -152,7 +136,6 @@ export function check(
        timestamp,
        payloadChecksum,
        awsService: service,
-        proxyPath,
    });
    log.trace('constructed stringToSign', { stringToSign });
    if (stringToSign instanceof Error) {
@ -183,3 +166,5 @@ export function check(
        },
    };
 }
+
+module.exports = { check };
--- a/lib/auth/v4/queryAuthCheck.js
+++ b/lib/auth/v4/queryAuthCheck.js
@ -1,18 +1,24 @@
-import { Logger } from 'werelogs';
-import * as constants from '../../constants';
-import errors from '../../errors';
-import constructStringToSign from './constructStringToSign';
-import { checkTimeSkew, convertAmzTimeToMs } from './timeUtils';
-import { validateCredentials, extractQueryParams } from './validateInputs';
-import { areSignedHeadersComplete } from './validateInputs';
+'use strict'; // eslint-disable-line strict
+
+const constants = require('../../constants');
+const errors = require('../../errors').default;
+
+const constructStringToSign = require('./constructStringToSign');
+const checkTimeSkew = require('./timeUtils').checkTimeSkew;
+const convertAmzTimeToMs = require('./timeUtils').convertAmzTimeToMs;
+const validateCredentials = require('./validateInputs').validateCredentials;
+const extractQueryParams = require('./validateInputs').extractQueryParams;
+const areSignedHeadersComplete =
+    require('./validateInputs').areSignedHeadersComplete;

 /**
 * V4 query auth check
- * @param request - HTTP request object
- * @param log - logging object
- * @param data - Contain authentification params (GET or POST data)
+ * @param {object} request - HTTP request object
+ * @param {object} log - logging object
+ * @param {object} data - Contain authentification params (GET or POST data)
+ * @return {callback} calls callback
 */
-export function check(request: any, log: Logger, data: { [key: string]: string }) {
+function check(request, log, data) {
    const authParams = extractQueryParams(data, log);

    if (Object.keys(authParams).length !== 5) {
@ -27,11 +33,11 @@ export function check(request: any, log: Logger, data: { [key: string]: string }
        return { err: errors.InvalidToken };
    }

-    const signedHeaders = authParams.signedHeaders!;
-    const signatureFromRequest = authParams.signatureFromRequest!;
-    const timestamp = authParams.timestamp!;
-    const expiry = authParams.expiry!;
-    const credential = authParams.credential!;
+    const signedHeaders = authParams.signedHeaders;
+    const signatureFromRequest = authParams.signatureFromRequest;
+    const timestamp = authParams.timestamp;
+    const expiry = authParams.expiry;
+    const credential = authParams.credential;

    if (!areSignedHeadersComplete(signedHeaders, request.headers)) {
        log.debug('signedHeaders are incomplete', { signedHeaders });
@ -56,17 +62,6 @@ export function check(request: any, log: Logger, data: { [key: string]: string }
        return { err: errors.RequestTimeTooSkewed };
    }

-    let proxyPath: string | undefined;
-    if (request.headers.proxy_path) {
-        try {
-            proxyPath = decodeURIComponent(request.headers.proxy_path);
-        } catch (err) {
-            log.debug('invalid proxy_path header', { proxyPath });
-            return { err: errors.InvalidArgument.customizeDescription(
-                'invalid proxy_path header') };
-        }
-    }
-
    // In query v4 auth, the canonical request needs
    // to include the query params OTHER THAN
    // the signature so create a
@ -92,7 +87,6 @@ export function check(request: any, log: Logger, data: { [key: string]: string }
        credentialScope:
            `${scopeDate}/${region}/${service}/${requestType}`,
        awsService: service,
-        proxyPath,
    });
    if (stringToSign instanceof Error) {
        return { err: stringToSign };
@ -116,3 +110,5 @@ export function check(request: any, log: Logger, data: { [key: string]: string }
        },
    };
 }
+
+module.exports = { check };
--- a/lib/auth/v4/streamingV4/V4Transform.js
+++ b/lib/auth/v4/streamingV4/V4Transform.js
@ -1,67 +1,33 @@
-import { Transform } from 'stream';
-import async from 'async';
-import errors from '../../../errors';
-import { Logger } from 'werelogs';
-import Vault, { AuthV4RequestParams } from '../../Vault';
-import { Callback } from '../../backends/in_memory/types';
+const { Transform } = require('stream');

-import constructChunkStringToSign from './constructChunkStringToSign';
+const async = require('async');
+const errors = require('../../../errors').default;

-export type TransformParams = {
-    accessKey: string;
-    signatureFromRequest: string;
-    region: string;
-    scopeDate: string;
-    timestamp: string;
-    credentialScope: string;
-};
+const constructChunkStringToSign = require('./constructChunkStringToSign');

 /**
 * This class is designed to handle the chunks sent in a streaming
 * v4 Auth request
 */
-export default class V4Transform extends Transform {
-    log: Logger;
-    cb: Callback;
-    accessKey: string;
-    region: string;
-    scopeDate: string;
-    timestamp: string;
-    credentialScope: string;
-    lastSignature: string;
-    currentSignature?: string;
-    haveMetadata: boolean;
-    seekingDataSize: number;
-    currentData?: any;
-    dataCursor: number;
-    currentMetadata: any[];
-    lastPieceDone: boolean;
-    lastChunk: boolean;
-    vault: Vault;
-
+class V4Transform extends Transform {
    /**
     * @constructor
-     * @param streamingV4Params - info for chunk authentication
-     * @param streamingV4Params.accessKey - requester's accessKey
-     * @param streamingV4Params.signatureFromRequest - signature
+     * @param {object} streamingV4Params - info for chunk authentication
+     * @param {string} streamingV4Params.accessKey - requester's accessKey
+     * @param {string} streamingV4Params.signatureFromRequest - signature
     * sent with headers
-     * @param streamingV4Params.region - region sent with auth header
-     * @param streamingV4Params.scopeDate - date sent with auth header
-     * @param streamingV4Params.timestamp - date parsed from headers
+     * @param {string} streamingV4Params.region - region sent with auth header
+     * @param {string} streamingV4Params.scopeDate - date sent with auth header
+     * @param {string} streamingV4Params.timestamp - date parsed from headers
     * in ISO 8601 format: YYYYMMDDTHHMMSSZ
-     * @param streamingV4Params.credentialScope - items from auth
+     * @param {string} streamingV4Params.credentialScope - items from auth
     * header plus the string 'aws4_request' joined with '/':
     * timestamp/region/aws-service/aws4_request
-     * @param vault - Vault instance passed from CloudServer
-     * @param log - logger object
-     * @param cb - callback to api
+     * @param {object} vault - Vault instance passed from CloudServer
+     * @param {object} log - logger object
+     * @param {function} cb - callback to api
     */
-    constructor(
-        streamingV4Params: TransformParams,
-        vault: Vault,
-        log: Logger,
-        cb: Callback,
-    ) {
+    constructor(streamingV4Params, vault, log, cb) {
        const { accessKey, signatureFromRequest, region, scopeDate, timestamp,
            credentialScope } = streamingV4Params;
        super({});
@ -89,8 +55,8 @@ export default class V4Transform extends Transform {

    /**
     * This function will parse the metadata portion of the chunk
-     * @param remainingChunk - chunk sent from _transform
-     * @return response - if error, will return 'err' key with
+     * @param {Buffer} remainingChunk - chunk sent from _transform
+     * @return {object} response - if error, will return 'err' key with
     * arsenal error value.
     * if incomplete metadata, will return 'completeMetadata' key with
     * value false
@ -98,7 +64,7 @@ export default class V4Transform extends Transform {
     * value true and the key 'unparsedChunk' with the remaining chunk without
     * the parsed metadata piece
     */
-    _parseMetadata(remainingChunk: Buffer) {
+    _parseMetadata(remainingChunk) {
        let remainingPlusStoredMetadata = remainingChunk;
        // have metadata pieces so need to add to the front of
        // remainingChunk
@ -137,8 +103,9 @@ export default class V4Transform extends Transform {
            'metadata format');
            return { err: errors.InvalidArgument };
        }
+        let dataSize = splitMeta[0];
        // chunk-size is sent in hex
-        const dataSize = Number.parseInt(splitMeta[0], 16);
+        dataSize = Number.parseInt(dataSize, 16);
        if (Number.isNaN(dataSize)) {
            this.log.trace('chunk body did not contain valid size');
            return { err: errors.InvalidArgument };
@ -172,30 +139,28 @@ export default class V4Transform extends Transform {

    /**
     * Build the stringToSign and authenticate the chunk
-     * @param dataToSend - chunk sent from _transform or null
+     * @param {Buffer} dataToSend - chunk sent from _transform or null
     * if last chunk without data
-     * @param done - callback to _transform
-     * @return executes callback with err if applicable
+     * @param {function} done - callback to _transform
+     * @return {function} executes callback with err if applicable
     */
-    _authenticate(dataToSend: Buffer | null, done: Callback) {
+    _authenticate(dataToSend, done) {
        // use prior sig to construct new string to sign
        const stringToSign = constructChunkStringToSign(this.timestamp,
-            this.credentialScope, this.lastSignature, dataToSend ?? undefined);
+            this.credentialScope, this.lastSignature, dataToSend);
        this.log.trace('constructed chunk string to sign',
            { stringToSign });
        // once used prior sig to construct string to sign, reassign
        // lastSignature to current signature
-        this.lastSignature = this.currentSignature!;
-        const vaultParams: AuthV4RequestParams = {
+        this.lastSignature = this.currentSignature;
+        const vaultParams = {
            log: this.log,
            data: {
                accessKey: this.accessKey,
-                signatureFromRequest: this.currentSignature!,
+                signatureFromRequest: this.currentSignature,
                region: this.region,
                scopeDate: this.scopeDate,
                stringToSign,
-                // TODO FIXME This can not work
-                // @ts-expect-errors
                timestamp: this.timestamp,
                credentialScope: this.credentialScope,
            },
@ -216,12 +181,12 @@ export default class V4Transform extends Transform {
     * use the metadata to authenticate with vault and send the
     * data on to be stored if authentication passes
     *
-     * @param chunk - chunk from request body
-     * @param _encoding - Data encoding unused
-     * @param callback - Callback(err, justDataChunk, encoding)
-     * @return executes callback with err if applicable
+     * @param {Buffer} chunk - chunk from request body
+     * @param {string} encoding - Data encoding
+     * @param {function} callback - Callback(err, justDataChunk, encoding)
+     * @return {function }executes callback with err if applicable
     */
-    _transform(chunk: Buffer, _encoding: string, callback: Callback) {
+    _transform(chunk, encoding, callback) {
        // 'chunk' here is the node streaming chunk
        // transfer-encoding chunks should be of the format:
        // string(IntHexBase(chunk-size)) + ";chunk-signature=" +
@ -258,8 +223,6 @@ export default class V4Transform extends Transform {
                    }
                    // have metadata so reset unparsedChunk to remaining
                    // without metadata piece
-                    // TODO Is that okay?
-                    // @ts-expect-errors
                    unparsedChunk = parsedMetadataResults.unparsedChunk;
                }
                if (this.lastChunk) {
@ -306,7 +269,7 @@ export default class V4Transform extends Transform {
            // final callback
            err => {
                if (err) {
-                    return this.cb(err as any);
+                    return this.cb(err);
                }
                // get next chunk
                return callback();
@ -314,3 +277,5 @@ export default class V4Transform extends Transform {
        );
    }
 }
+
+module.exports = V4Transform;
--- a/lib/auth/v4/streamingV4/constructChunkStringToSign.js
+++ b/lib/auth/v4/streamingV4/constructChunkStringToSign.js
@ -0,0 +1,32 @@
+const crypto = require('crypto');
+
+const constants = require('../../../constants');
+
+/**
+ * Constructs stringToSign for chunk
+ * @param {string} timestamp - date parsed from headers
+ * in ISO 8601 format: YYYYMMDDTHHMMSSZ
+ * @param {string} credentialScope - items from auth
+ * header plus the string 'aws4_request' joined with '/':
+ * timestamp/region/aws-service/aws4_request
+ * @param {string} lastSignature - signature from headers or prior chunk
+ * @param {string} justDataChunk - data portion of chunk
+ * @returns {string} stringToSign
+ */
+function constructChunkStringToSign(timestamp,
+    credentialScope, lastSignature, justDataChunk) {
+    let currentChunkHash;
+    // for last chunk, there will be no data, so use emptyStringHash
+    if (!justDataChunk) {
+        currentChunkHash = constants.emptyStringHash;
+    } else {
+        currentChunkHash = crypto.createHash('sha256');
+        currentChunkHash = currentChunkHash
+            .update(justDataChunk, 'binary').digest('hex');
+    }
+    return `AWS4-HMAC-SHA256-PAYLOAD\n${timestamp}\n` +
+        `${credentialScope}\n${lastSignature}\n` +
+        `${constants.emptyStringHash}\n${currentChunkHash}`;
+}
+
+module.exports = constructChunkStringToSign;
--- a/lib/auth/v4/streamingV4/constructChunkStringToSign.ts
+++ b/lib/auth/v4/streamingV4/constructChunkStringToSign.ts
@ -1,35 +0,0 @@
-import * as crypto from 'crypto';
-import * as constants from '../../../constants';
-
-/**
- * Constructs stringToSign for chunk
- * @param timestamp - date parsed from headers
- * in ISO 8601 format: YYYYMMDDTHHMMSSZ
- * @param credentialScope - items from auth
- * header plus the string 'aws4_request' joined with '/':
- * timestamp/region/aws-service/aws4_request
- * @param lastSignature - signature from headers or prior chunk
- * @param justDataChunk - data portion of chunk
- * @returns stringToSign
- */
-export default function constructChunkStringToSign(
-    timestamp: string,
-    credentialScope: string,
-    lastSignature: string,
-    justDataChunk?: Buffer | string,
-) {
-    let currentChunkHash: string;
-    // for last chunk, there will be no data, so use emptyStringHash
-    if (!justDataChunk) {
-        currentChunkHash = constants.emptyStringHash;
-    } else {
-        const hash = crypto.createHash('sha256');
-        const temp = justDataChunk instanceof Buffer
-            ? hash.update(justDataChunk)
-            : hash.update(justDataChunk, 'binary');
-        currentChunkHash = temp.digest('hex');
-    }
-    return `AWS4-HMAC-SHA256-PAYLOAD\n${timestamp}\n` +
-        `${credentialScope}\n${lastSignature}\n` +
-        `${constants.emptyStringHash}\n${currentChunkHash}`;
-}
--- a/lib/auth/v4/timeUtils.js
+++ b/lib/auth/v4/timeUtils.js
@ -1,11 +1,12 @@
-import { Logger } from 'werelogs';
+'use strict'; // eslint-disable-line strict

 /**
 * Convert timestamp to milliseconds since Unix Epoch
- * @param timestamp of ISO8601Timestamp format without
+ * @param  {string} timestamp of ISO8601Timestamp format without
 * dashes or colons, e.g. 20160202T220410Z
+ * @return {number} number of milliseconds since Unix Epoch
 */
-export function convertAmzTimeToMs(timestamp: string) {
+function convertAmzTimeToMs(timestamp) {
    const arr = timestamp.split('');
    // Convert to YYYY-MM-DDTHH:mm:ss.sssZ
    const ISO8601time = `${arr.slice(0, 4).join('')}-${arr[4]}${arr[5]}` +
@ -14,12 +15,13 @@ export function convertAmzTimeToMs(timestamp: string) {
    return Date.parse(ISO8601time);
 }

+
 /**
 * Convert UTC timestamp to ISO 8601 timestamp
- * @param timestamp of UTC form: Fri, 10 Feb 2012 21:34:55 GMT
- * @return ISO8601 timestamp of form: YYYYMMDDTHHMMSSZ
+ * @param  {string} timestamp of UTC form: Fri, 10 Feb 2012 21:34:55 GMT
+ * @return {string} ISO8601 timestamp of form: YYYYMMDDTHHMMSSZ
 */
-export function convertUTCtoISO8601(timestamp: string | number) {
+function convertUTCtoISO8601(timestamp) {
    // convert to ISO string: YYYY-MM-DDTHH:mm:ss.sssZ.
    const converted = new Date(timestamp).toISOString();
    // Remove "-"s and "."s and milliseconds
@ -28,13 +30,13 @@ export function convertUTCtoISO8601(timestamp: string | number) {

 /**
 * Check whether timestamp predates request or is too old
- * @param timestamp of ISO8601Timestamp format without
+ * @param  {string} timestamp of ISO8601Timestamp format without
 * dashes or colons, e.g. 20160202T220410Z
- * @param expiry - number of seconds signature should be valid
- * @param log - log for request
- * @return true if there is a time problem
+ * @param {number} expiry - number of seconds signature should be valid
+ * @param {object} log - log for request
+ * @return {boolean} true if there is a time problem
 */
-export function checkTimeSkew(timestamp: string, expiry: number, log: Logger) {
+function checkTimeSkew(timestamp, expiry, log) {
    const currentTime = Date.now();
    const fifteenMinutes = (15 * 60 * 1000);
    const parsedTimestamp = convertAmzTimeToMs(timestamp);
@ -54,3 +56,5 @@ export function checkTimeSkew(timestamp: string, expiry: number, log: Logger) {
    }
    return false;
 }
+
+module.exports = { convertAmzTimeToMs, convertUTCtoISO8601, checkTimeSkew };
--- a/lib/auth/v4/validateInputs.js
+++ b/lib/auth/v4/validateInputs.js
@ -1,19 +1,17 @@
-import { Logger } from 'werelogs';
-import errors from '../../../lib/errors';
+'use strict'; // eslint-disable-line strict
+
+const errors = require('../../../lib/errors').default;

 /**
 * Validate Credentials
- * @param credentials - contains accessKey, scopeDate,
+ * @param  {array} credentials - contains accessKey, scopeDate,
 * region, service, requestType
- * @param timestamp - timestamp from request in
+ * @param {string} timestamp - timestamp from request in
 * the format of ISO 8601: YYYYMMDDTHHMMSSZ
- * @param log - logging object
+ * @param {object} log - logging object
+ * @return {boolean} true if credentials are correct format, false if not
 */
-export function validateCredentials(
-    credentials: [string, string, string, string, string],
-    timestamp: string,
-    log: Logger
-): Error | {} {
+function validateCredentials(credentials, timestamp, log) {
    if (!Array.isArray(credentials) || credentials.length !== 5) {
        log.warn('credentials in improper format', { credentials });
        return errors.InvalidArgument;
@ -60,21 +58,12 @@ export function validateCredentials(

 /**
 * Extract and validate components from query object
- * @param  queryObj - query object from request
- * @param log - logging object
- * @return object containing extracted query params for authV4
+ * @param  {object} queryObj - query object from request
+ * @param {object} log - logging object
+ * @return {object} object containing extracted query params for authV4
 */
-export function extractQueryParams(
-    queryObj: { [key: string]: string | undefined },
-    log: Logger
-) {
-    const authParams: {
-        signedHeaders?: string;
-        signatureFromRequest?: string;
-        timestamp?: string;
-        expiry?: number;
-        credential?: [string, string, string, string, string];
-    } = {};
+function extractQueryParams(queryObj, log) {
+    const authParams = {};

    // Do not need the algorithm sent back
    if (queryObj['X-Amz-Algorithm'] !== 'AWS4-HMAC-SHA256') {
@ -110,7 +99,7 @@ export function extractQueryParams(
        return authParams;
    }

-    const expiry = Number.parseInt(queryObj['X-Amz-Expires'] ?? 'nope', 10);
+    const expiry = Number.parseInt(queryObj['X-Amz-Expires'], 10);
    const sevenDays = 604800;
    if (expiry && (expiry > 0 && expiry <= sevenDays)) {
        authParams.expiry = expiry;
@ -121,7 +110,6 @@ export function extractQueryParams(

    const credential = queryObj['X-Amz-Credential'];
    if (credential && credential.length > 28 && credential.indexOf('/') > -1) {
-        // @ts-ignore
        authParams.credential = credential.split('/');
    } else {
        log.warn('invalid credential param', { credential });
@ -133,17 +121,14 @@ export function extractQueryParams(

 /**
 * Extract and validate components from auth header
- * @param authHeader - authorization header from request
- * @param log - logging object
- * @return object containing extracted auth header items for authV4
+ * @param  {string} authHeader - authorization header from request
+ * @param {object} log - logging object
+ * @return {object} object containing extracted auth header items for authV4
 */
-export function extractAuthItems(authHeader: string, log: Logger) {
-    const authItems: {
-        credentialsArr?: [string, string, string, string, string];
-        signedHeaders?: string;
-        signatureFromRequest?: string;
-    } = {};
-    const authArray = authHeader.replace('AWS4-HMAC-SHA256 ', '').split(',');
+function extractAuthItems(authHeader, log) {
+    const authItems = {};
+    const authArray = authHeader
+        .replace('AWS4-HMAC-SHA256 ', '').split(',');

    if (authArray.length < 3) {
        return authItems;
@ -153,12 +138,8 @@ export function extractAuthItems(authHeader: string, log: Logger) {
    const signedHeadersStr = authArray[1];
    const signatureStr = authArray[2];
    log.trace('credentials from request', { credentialStr });
-    if (
-        credentialStr &&
-        credentialStr.trim().startsWith('Credential=') &&
-        credentialStr.indexOf('/') > -1
-    ) {
-        // @ts-ignore
+    if (credentialStr && credentialStr.trim().startsWith('Credential=')
+        && credentialStr.indexOf('/') > -1) {
        authItems.credentialsArr = credentialStr
            .trim().replace('Credential=', '').split('/');
    } else {
@ -185,11 +166,11 @@ export function extractAuthItems(authHeader: string, log: Logger) {
 /**
 * Checks whether the signed headers include the host header
 * and all x-amz- and x-scal- headers in request
- * @param signedHeaders - signed headers sent with request
- * @param allHeaders - request.headers
- * @return true if all x-amz-headers included and false if not
+ * @param {string} signedHeaders - signed headers sent with request
+ * @param {object} allHeaders - request.headers
+ * @return {boolean} true if all x-amz-headers included and false if not
 */
-export function areSignedHeadersComplete(signedHeaders: string, allHeaders: Headers) {
+function areSignedHeadersComplete(signedHeaders, allHeaders) {
    const signedHeadersList = signedHeaders.split(';');
    if (signedHeadersList.indexOf('host') === -1) {
        return false;
@ -204,3 +185,6 @@ export function areSignedHeadersComplete(signedHeaders: string, allHeaders: Head
    }
    return true;
 }
+
+module.exports = { validateCredentials, extractQueryParams,
+    areSignedHeadersComplete, extractAuthItems };
--- a/lib/clustering/ClusterRPC.ts
+++ b/lib/clustering/ClusterRPC.ts
@ -1,569 +0,0 @@
-import cluster, { Worker } from 'cluster';
-import * as werelogs from 'werelogs';
-
-import { default as errors } from '../../lib/errors';
-
-const rpcLogger = new werelogs.Logger('ClusterRPC');
-
-/**
- * Remote procedure calls support between cluster workers.
- *
- * When using the cluster module, new processes are forked and are
- * dispatched workloads, usually HTTP requests. The ClusterRPC module
- * implements a RPC system to send commands to all cluster worker
- * processes at once from any particular worker, and retrieve their
- * individual command results, like a distributed map operation.
- *
- * The existing nodejs cluster IPC channel is setup from the primary
- * to each worker, but not between workers, so there has to be a hop
- * by the primary.
- *
- * How a command is treated:
- *
- * - a worker sends a command message to the primary
- *
- * - the primary then forwards that command to each existing worker
- *   (including the requestor)
- *
- * - each worker then executes the command and returns a result or an
- *   error
- *
- * - the primary gathers all workers results into an array
- *
- * - finally, the primary dispatches the results array to the original
- *   requesting worker
- *
- *
- * Limitations:
- *
- * - The command payload must be serializable, which means that:
- *   - it should not contain circular references
- *   - it should be of a reasonable size to be sent in a single RPC message
- *
- * - The "toWorkers" parameter of value "*" targets the set of workers
- *   that are available at the time the command is dispatched. Any new
- *   worker spawned after the command has been dispatched for
- *   processing, but before the command completes, don't execute
- *   the command and hence are not part of the results array.
- *
- *
- * To set it up:
- *
- * - On the primary:
- *     if (cluster.isPrimary) {
- *         setupRPCPrimary();
- *     }
- *
- * - On the workers:
- *     if (!cluster.isPrimary) {
- *         setupRPCWorker({
- *             handler1: (payload: object, uids: string, callback: HandlerCallback) => void,
- *             handler2: ...
- *         });
- *     }
- *     Handler functions will be passed the command payload, request
- *     serialized uids, and must call the callback when the worker is done
- *     processing the command:
- *         callback(error: Error | null | undefined, result?: any)
- *
- * When this setup is done, any worker can start sending commands by calling
- * the async function sendWorkerCommand().
- */
-
-// exported types
-
-export type ResultObject = {
-    error: Error | null;
-    result: any;
-};
-
-/**
- * saved Promise for sendWorkerCommand
- */
-export type CommandPromise = {
-    resolve: (results?: ResultObject[]) => void;
-    reject: (error: Error) => void;
-    timeout: NodeJS.Timeout | null;
-};
-export type HandlerCallback = (error: (Error & { code?: number }) | null | undefined, result?: any) => void;
-export type HandlerFunction = (payload: object, uids: string, callback: HandlerCallback) => void;
-export type HandlersMap = {
-    [index: string]: HandlerFunction;
-};
-export type PrimaryHandlerFunction = (worker: Worker, payload: object, uids: string, callback: HandlerCallback) => void;
-export type PrimaryHandlersMap = Record<string, PrimaryHandlerFunction>;
-
-// private types
-
-type RPCMessage<T extends string, P> = {
-    type: T;
-    uids: string;
-    payload: P;
-};
-
-type RPCCommandMessage = RPCMessage<'cluster-rpc:command', any> & {
-    toWorkers: string;
-    toHandler: string;
-};
-
-type MarshalledResultObject = {
-    error: string | null;
-    errorCode?: number;
-    result: any;
-};
-
-type RPCCommandResultMessage = RPCMessage<'cluster-rpc:commandResult', MarshalledResultObject>;
-
-type RPCCommandResultsMessage = RPCMessage<'cluster-rpc:commandResults', {
-    results: MarshalledResultObject[];
-}>;
-
-type RPCCommandErrorMessage = RPCMessage<'cluster-rpc:commandError', {
-    error: string;
-}>;
-
-interface RPCSetupOptions {
-    /**
-     * As werelogs is not a peerDependency, arsenal and a parent project
-     * might have their own separate versions duplicated in dependencies.
-     * The config are therefore not shared.
-     * Use this to propagate werelogs config to arsenal's ClusterRPC.
-     */
-    werelogsConfig?: Parameters<typeof werelogs.configure>[0];
-};
-
-/**
- * In primary: store worker IDs that are waiting to be dispatched
- * their command's results, as a mapping.
- */
-const uidsToWorkerId: {
-    [index: string]: number;
-} = {};
-
-
-/**
- * In primary: store worker responses for commands in progress as a
- * mapping.
- *
- * Result objects are 'null' while the worker is still processing the
- * command. When a worker finishes processing it stores the result as:
- *    {
- *        error: string | null,
- *        result: any
- *    }
- */
-const uidsToCommandResults: {
-    [index: string]: {
-        [index: number]: MarshalledResultObject | null;
-    };
-} = {};
-
-/**
- * In workers: store promise callbacks for commands waiting to be
- * dispatched, as a mapping.
- */
-const uidsToCommandPromise: {
-    [index: string]: CommandPromise;
-} = {};
-
-
-function _isRpcMessage(message) {
-    return (message !== null &&
-            typeof message === 'object' &&
-            typeof message.type === 'string' &&
-            message.type.startsWith('cluster-rpc:'));
-}
-
-/**
- * Setup cluster RPC system on the primary
- *
- * @param {object} [handlers] - mapping of handler names to handler functions
- *     handler function:
- *         `handler({Worker} worker, {object} payload, {string} uids, {function} callback)`
- *     handler callback must be called when worker is done with the command:
- *         `callback({Error|null} error, {any} [result])`
- * @return {undefined}
- */
-export function setupRPCPrimary(handlers?: PrimaryHandlersMap, options?: RPCSetupOptions) {
-    if (options?.werelogsConfig) {
-        werelogs.configure(options.werelogsConfig);
-    }
-    cluster.on('message', (worker, message) => {
-        if (_isRpcMessage(message)) {
-            _handlePrimaryMessage(worker, message, handlers);
-        }
-    });
-}
-
-/**
- * Setup RPCs on a cluster worker process
- *
- * @param {object} handlers - mapping of handler names to handler functions
- *     handler function:
- *         handler({object} payload, {string} uids, {function} callback)
- *     handler callback must be called when worker is done with the command:
- *         callback({Error|null} error, {any} [result])
- * @return {undefined}
- * }
- */
-export function setupRPCWorker(handlers: HandlersMap, options?: RPCSetupOptions) {
-    if (!process.send) {
-        throw new Error('fatal: cannot setup cluster RPC: "process.send" is not available');
-    }
-    if (options?.werelogsConfig) {
-        werelogs.configure(options.werelogsConfig);
-    }
-    process.on('message', (message: RPCCommandMessage | RPCCommandResultsMessage) => {
-        if (_isRpcMessage(message)) {
-            _handleWorkerMessage(message, handlers);
-        }
-    });
-}
-
-/**
- * Send a command for workers to execute in parallel, and wait for results
- *
- * @param {string} toWorkers - which workers should execute the command
- *     Currently the supported values are:
- *         - "*", meaning all workers will execute the command
- *         - "PRIMARY", meaning primary process will execute the command
- * @param {string} toHandler - name of handler that will execute the
- * command in workers, as declared in setupRPCWorker() parameter object
- * @param {string} uids - unique identifier of the command, must be
- * unique across all commands in progress
- * @param {object} payload - message payload, sent as-is to the handler
- * @param {number} [timeoutMs=60000] - timeout the command with a
- * "RequestTimeout" error after this number of milliseconds - set to 0
- * to disable timeouts (the command may then hang forever)
- * @returns {Promise}
- */
-export async function sendWorkerCommand(
-    toWorkers: string,
-    toHandler: string,
-    uids: string,
-    payload: object,
-    timeoutMs: number = 60000
-) {
-    if (typeof uids !== 'string') {
-        rpcLogger.error('missing or invalid "uids" field', { uids });
-        throw errors.MissingParameter;
-    }
-    if (uidsToCommandPromise[uids] !== undefined) {
-        rpcLogger.error('a command is already in progress with same uids', { uids });
-        throw errors.OperationAborted;
-    }
-    rpcLogger.info('sending command', { toWorkers, toHandler, uids, payload });
-    return new Promise((resolve, reject) => {
-        let timeout: NodeJS.Timeout | null = null;
-        if (timeoutMs) {
-            timeout = setTimeout(() => {
-                delete uidsToCommandPromise[uids];
-                reject(errors.RequestTimeout);
-            }, timeoutMs);
-        }
-        uidsToCommandPromise[uids] = { resolve, reject, timeout };
-        const message: RPCCommandMessage = {
-            type: 'cluster-rpc:command',
-            toWorkers,
-            toHandler,
-            uids,
-            payload,
-        };
-        return process.send?.(message);
-    });
-}
-
-/**
- * Get the number of commands in flight
- * @returns {number}
- */
-export function getPendingCommandsCount() {
-    return Object.keys(uidsToCommandPromise).length;
-}
-
-
-function _dispatchCommandResultsToWorker(
-    worker: Worker,
-    uids: string,
-    resultsArray: MarshalledResultObject[]
-): void {
-    const message: RPCCommandResultsMessage = {
-        type: 'cluster-rpc:commandResults',
-        uids,
-        payload: {
-            results: resultsArray,
-        },
-    };
-    worker.send(message);
-}
-
-function _dispatchCommandErrorToWorker(
-    worker: Worker,
-    uids: string,
-    error: Error,
-): void {
-    const message: RPCCommandErrorMessage = {
-        type: 'cluster-rpc:commandError',
-        uids,
-        payload: {
-            error: error.message,
-        },
-    };
-    worker.send(message);
-}
-
-function _sendPrimaryCommandResult(
-    worker: Worker,
-    uids: string,
-    error: (Error & { code?: number }) | null | undefined,
-    result?: any
-): void {
-    const message: RPCCommandResultsMessage = {
-        type: 'cluster-rpc:commandResults',
-        uids,
-        payload: {
-            results: [{ error: error?.message || null, errorCode: error?.code, result }],
-        },
-    };
-    worker.send?.(message);
-}
-
-function _handlePrimaryCommandMessage(
-    fromWorker: Worker,
-    logger: any,
-    message: RPCCommandMessage,
-    handlers?: PrimaryHandlersMap
-): void {
-    const { toWorkers, toHandler, uids, payload } = message;
-    if (toWorkers === '*') {
-        if (uidsToWorkerId[uids] !== undefined) {
-            logger.warn('new command already has a waiting worker with same uids', {
-                uids, workerId: uidsToWorkerId[uids],
-            });
-            return undefined;
-        }
-        const commandResults = {};
-        for (const workerId of Object.keys(cluster.workers || {})) {
-            commandResults[workerId] = null;
-        }
-        uidsToWorkerId[uids] = fromWorker?.id;
-        uidsToCommandResults[uids] = commandResults;
-
-        for (const [workerId, worker] of Object.entries(cluster.workers || {})) {
-            logger.debug('sending command message to worker', {
-                workerId, toHandler, payload,
-            });
-            if (worker) {
-                worker.send(message);
-            }
-        }
-    } else if (toWorkers === 'PRIMARY') {
-        const { toHandler, uids, payload } = message;
-        const cb: HandlerCallback = (err, result) => _sendPrimaryCommandResult(fromWorker, uids, err, result);
-
-        if (toHandler in (handlers || {})) {
-            return handlers![toHandler](fromWorker, payload, uids, cb);
-        }
-        logger.error('no such handler in "toHandler" field from worker command message', {
-            toHandler,
-        });
-        return cb(errors.NotImplemented);
-    } else {
-        logger.error('unsupported "toWorkers" field from worker command message', {
-            toWorkers,
-        });
-        if (fromWorker) {
-            _dispatchCommandErrorToWorker(fromWorker, uids, errors.NotImplemented);
-        }
-    }
-}
-
-function _handlePrimaryCommandResultMessage(
-    fromWorkerId: number,
-    logger: any,
-    message: RPCCommandResultMessage
-): void {
-    const { uids, payload } = message;
-    const commandResults = uidsToCommandResults[uids];
-    if (!commandResults) {
-        logger.warn('received command response message from worker for command not in flight', {
-            workerId: fromWorkerId,
-            uids,
-        });
-        return undefined;
-    }
-    if (commandResults[fromWorkerId] === undefined) {
-        logger.warn('received command response message with unexpected worker ID', {
-            workerId: fromWorkerId,
-            uids,
-        });
-        return undefined;
-    }
-    if (commandResults[fromWorkerId] !== null) {
-        logger.warn('ignoring duplicate command response from worker', {
-            workerId: fromWorkerId,
-            uids,
-        });
-        return undefined;
-    }
-    commandResults[fromWorkerId] = payload;
-    const commandResultsArray = Object.values(commandResults);
-    if (commandResultsArray.every(response => response !== null)) {
-        logger.debug('all workers responded to command', { uids });
-        const completeCommandResultsArray = <MarshalledResultObject[]> commandResultsArray;
-        const toWorkerId = uidsToWorkerId[uids];
-        const toWorker = cluster.workers?.[toWorkerId];
-
-        delete uidsToCommandResults[uids];
-        delete uidsToWorkerId[uids];
-
-        if (!toWorker) {
-            logger.warn('worker shut down while its command was executing', {
-                workerId: toWorkerId, uids,
-            });
-            return undefined;
-        }
-        // send back response to original worker
-        _dispatchCommandResultsToWorker(toWorker, uids, completeCommandResultsArray);
-    }
-}
-
-function _handlePrimaryMessage(
-    fromWorker: Worker,
-    message: RPCCommandMessage | RPCCommandResultMessage,
-    handlers?: PrimaryHandlersMap
-): void {
-    const { type: messageType, uids } = message;
-    const logger = rpcLogger.newRequestLoggerFromSerializedUids(uids);
-    logger.debug('primary received message from worker', {
-        workerId: fromWorker?.id, rpcMessage: message,
-    });
-    if (messageType === 'cluster-rpc:command') {
-        return _handlePrimaryCommandMessage(fromWorker, logger, message, handlers);
-    }
-    if (messageType === 'cluster-rpc:commandResult') {
-        return _handlePrimaryCommandResultMessage(fromWorker?.id, logger, message);
-    }
-    logger.error('unsupported message type', {
-        workerId: fromWorker?.id, messageType, uids,
-    });
-    return undefined;
-}
-
-function _sendWorkerCommandResult(
-    uids: string,
-    error: Error | null | undefined,
-    result?: any
-): void {
-    const message: RPCCommandResultMessage = {
-        type: 'cluster-rpc:commandResult',
-        uids,
-        payload: {
-            error: error ? error.message : null,
-            result,
-        },
-    };
-    process.send?.(message);
-}
-
-function _handleWorkerCommandMessage(
-    logger: any,
-    message: RPCCommandMessage,
-    handlers: HandlersMap
-): void {
-    const { toHandler, uids, payload } = message;
-    const cb: HandlerCallback = (err, result) => _sendWorkerCommandResult(uids, err, result);
-
-    if (toHandler in handlers) {
-        return handlers[toHandler](payload, uids, cb);
-    }
-    logger.error('no such handler in "toHandler" field from worker command message', {
-        toHandler,
-    });
-    return cb(errors.NotImplemented);
-}
-
-function _handleWorkerCommandResultsMessage(
-    logger: any,
-    message: RPCCommandResultsMessage,
-): void {
-    const { uids, payload } = message;
-    const { results } = payload;
-    const commandPromise: CommandPromise = uidsToCommandPromise[uids];
-    if (commandPromise === undefined) {
-        logger.error('missing promise for command results', { uids, payload });
-        return undefined;
-    }
-    if (commandPromise.timeout) {
-        clearTimeout(commandPromise.timeout);
-    }
-    delete uidsToCommandPromise[uids];
-    const unmarshalledResults = results.map(workerResult => {
-        let workerError: Error | null = null;
-        if (workerResult.error) {
-            if (workerResult.error in errors) {
-                workerError = errors[workerResult.error];
-            } else {
-                workerError = new Error(workerResult.error);
-            }
-        }
-        if (workerError && workerResult.errorCode) {
-            (workerError as Error & { code: number }).code = workerResult.errorCode;
-        }
-        const unmarshalledResult: ResultObject = {
-            error: workerError,
-            result: workerResult.result,
-        };
-        return unmarshalledResult;
-    });
-    return commandPromise.resolve(unmarshalledResults);
-}
-
-function _handleWorkerCommandErrorMessage(
-    logger: any,
-    message: RPCCommandErrorMessage,
-): void {
-    const { uids, payload } = message;
-    const { error } = payload;
-    const commandPromise: CommandPromise = uidsToCommandPromise[uids];
-    if (commandPromise === undefined) {
-        logger.error('missing promise for command results', { uids, payload });
-        return undefined;
-    }
-    if (commandPromise.timeout) {
-        clearTimeout(commandPromise.timeout);
-    }
-    delete uidsToCommandPromise[uids];
-    let commandError: Error | null = null;
-    if (error in errors) {
-        commandError = errors[error];
-    } else {
-        commandError = new Error(error);
-    }
-    return commandPromise.reject(<Error> commandError);
-}
-
-function _handleWorkerMessage(
-    message: RPCCommandMessage | RPCCommandResultsMessage | RPCCommandErrorMessage,
-    handlers: HandlersMap
-): void {
-    const { type: messageType, uids } = message;
-    const workerId = cluster.worker?.id;
-    const logger = rpcLogger.newRequestLoggerFromSerializedUids(uids);
-    logger.debug('worker received message from primary', {
-        workerId, rpcMessage: message,
-    });
-    if (messageType === 'cluster-rpc:command') {
-        return _handleWorkerCommandMessage(logger, message, handlers);
-    }
-    if (messageType === 'cluster-rpc:commandResults') {
-        return _handleWorkerCommandResultsMessage(logger, message);
-    }
-    if (messageType === 'cluster-rpc:commandError') {
-        return _handleWorkerCommandErrorMessage(logger, message);
-    }
-    logger.error('unsupported message type', {
-        workerId, messageType,
-    });
-    return undefined;
-}
--- a/lib/constants.js
+++ b/lib/constants.js
@ -0,0 +1,121 @@
+'use strict'; // eslint-disable-line strict
+
+// The min value here is to manage further backward compat if we
+// need it
+const iamSecurityTokenSizeMin = 128;
+const iamSecurityTokenSizeMax = 128;
+// Security token is an hex string (no real format from amazon)
+const iamSecurityTokenPattern =
+    new RegExp(`^[a-f0-9]{${iamSecurityTokenSizeMin},` +
+        `${iamSecurityTokenSizeMax}}$`);
+
+module.exports = {
+    // info about the iam security token
+    iamSecurityToken: {
+        min: iamSecurityTokenSizeMin,
+        max: iamSecurityTokenSizeMax,
+        pattern: iamSecurityTokenPattern,
+    },
+    // PublicId is used as the canonicalID for a request that contains
+    // no authentication information.  Requestor can access
+    // only public resources
+    publicId: 'http://acs.amazonaws.com/groups/global/AllUsers',
+    zenkoServiceAccount: 'http://acs.zenko.io/accounts/service',
+    metadataFileNamespace: '/MDFile',
+    dataFileURL: '/DataFile',
+    // AWS states max size for user-defined metadata
+    // (x-amz-meta- headers) is 2 KB:
+    // http://docs.aws.amazon.com/AmazonS3/latest/API/RESTObjectPUT.html
+    // In testing, AWS seems to allow up to 88 more bytes,
+    // so we do the same.
+    maximumMetaHeadersSize: 2136,
+    emptyFileMd5: 'd41d8cd98f00b204e9800998ecf8427e',
+    // Version 2 changes the format of the data location property
+    // Version 3 adds the dataStoreName attribute
+    mdModelVersion: 3,
+    /*
+     * Splitter is used to build the object name for the overview of a
+     * multipart upload and to build the object names for each part of a
+     * multipart upload.  These objects with large names are then stored in
+     * metadata in a "shadow bucket" to a real bucket.  The shadow bucket
+     * contains all ongoing multipart uploads.  We include in the object
+     * name some of the info we might need to pull about an open multipart
+     * upload or about an individual part with each piece of info separated
+     * by the splitter.  We can then extract each piece of info by splitting
+     * the object name string with this splitter.
+     * For instance, assuming a splitter of '...!*!',
+     * the name of the upload overview would be:
+     *   overview...!*!objectKey...!*!uploadId
+     * For instance, the name of a part would be:
+     *   uploadId...!*!partNumber
+     *
+     * The sequence of characters used in the splitter should not occur
+     * elsewhere in the pieces of info to avoid splitting where not
+     * intended.
+     *
+     * Splitter is also used in adding bucketnames to the
+     * namespacerusersbucket.  The object names added to the
+     * namespaceusersbucket are of the form:
+     * canonicalID...!*!bucketname
+     */
+
+    splitter: '..|..',
+    usersBucket: 'users..bucket',
+    // MPU Bucket Prefix is used to create the name of the shadow
+    // bucket used for multipart uploads.  There is one shadow mpu
+    // bucket per bucket and its name is the mpuBucketPrefix followed
+    // by the name of the final destination bucket for the object
+    // once the multipart upload is complete.
+    mpuBucketPrefix: 'mpuShadowBucket',
+    // since aws s3 does not allow capitalized buckets, these may be
+    // used for special internal purposes
+    permittedCapitalizedBuckets: {
+        METADATA: true,
+    },
+    /* eslint-disable camelcase */
+    externalBackends: { aws_s3: true, azure: true, gcp: true, pfs: true },
+    hasCopyPartBackends: { aws_s3: true, gcp: true },
+    versioningNotImplBackends: { azure: true, gcp: true },
+    mpuMDStoredExternallyBackend: { aws_s3: true, gcp: true },
+    /* eslint-enable camelcase */
+    // Default expiration value of the S3 pre-signed URL duration
+    // 604800 seconds (seven days).
+    defaultPreSignedURLExpiry: 7 * 24 * 60 * 60,
+    // Regex for ISO-8601 formatted date
+    shortIso8601Regex: /\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}Z/,
+    longIso8601Regex: /\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}.\d{3}Z/,
+    supportedNotificationEvents: new Set([
+        's3:ObjectCreated:*',
+        's3:ObjectCreated:Put',
+        's3:ObjectCreated:Copy',
+        's3:ObjectCreated:CompleteMultipartUpload',
+        's3:ObjectRemoved:*',
+        's3:ObjectRemoved:Delete',
+        's3:ObjectRemoved:DeleteMarkerCreated',
+    ]),
+    notificationArnPrefix: 'arn:scality:bucketnotif',
+    // some of the available data backends  (if called directly rather
+    // than through the multiple backend gateway) need a key provided
+    // as a string as first parameter of the get/delete methods.
+    clientsRequireStringKey: { sproxyd: true, cdmi: true },
+    // HTTP server keep-alive timeout is set to a higher value than
+    // client's free sockets timeout to avoid the risk of triggering
+    // ECONNRESET errors if the server closes the connection at the
+    // exact moment clients attempt to reuse an established connection
+    // for a new request.
+    //
+    // Note: the ability to close inactive connections on the client
+    // after httpClientFreeSocketsTimeout milliseconds requires the
+    // use of "agentkeepalive" module instead of the regular node.js
+    // http.Agent.
+    httpServerKeepAliveTimeout: 60000,
+    httpClientFreeSocketTimeout: 55000,
+    supportedLifecycleRules: [
+        'expiration',
+        'noncurrentVersionExpiration',
+        'abortIncompleteMultipartUpload',
+    ],
+    // Maximum number of buckets to cache (bucket metadata)
+    maxCachedBuckets: process.env.METADATA_MAX_CACHED_BUCKETS ?
+        Number(process.env.METADATA_MAX_CACHED_BUCKETS) : 1000,
+};
--- a/lib/constants.ts
+++ b/lib/constants.ts
@ -1,177 +0,0 @@
-import * as crypto from 'crypto';
-
-// The min value here is to manage further backward compat if we
-// need it
-// Default value
-export const vaultGeneratedIamSecurityTokenSizeMin = 128;
-// Safe to assume that a typical token size is less than 8192 bytes
-export const vaultGeneratedIamSecurityTokenSizeMax = 8192;
-// Base-64
-export const vaultGeneratedIamSecurityTokenPattern = /^[A-Za-z0-9/+=]*$/;
-
-// info about the iam security token
-export const iamSecurityToken = {
-    min: vaultGeneratedIamSecurityTokenSizeMin,
-    max: vaultGeneratedIamSecurityTokenSizeMax,
-    pattern: vaultGeneratedIamSecurityTokenPattern,
-};
-// PublicId is used as the canonicalID for a request that contains
-// no authentication information.  Requestor can access
-// only public resources
-export const publicId = 'http://acs.amazonaws.com/groups/global/AllUsers';
-export const zenkoServiceAccount = 'http://acs.zenko.io/accounts/service';
-export const metadataFileNamespace = '/MDFile';
-export const dataFileURL = '/DataFile';
-export const passthroughFileURL = '/PassthroughFile';
-// AWS states max size for user-defined metadata
-// (x-amz-meta- headers) is 2 KB:
-// http://docs.aws.amazon.com/AmazonS3/latest/API/RESTObjectPUT.html
-// In testing, AWS seems to allow up to 88 more bytes,
-// so we do the same.
-export const maximumMetaHeadersSize = 2136;
-export const emptyFileMd5 = 'd41d8cd98f00b204e9800998ecf8427e';
-// Version 2 changes the format of the data location property
-// Version 3 adds the dataStoreName attribute
-// Version 4 add the Creation-Time and Content-Language attributes,
-//     and add support for x-ms-meta-* headers in UserMetadata
-// Version 5 adds the azureInfo structure
-// Version 6 adds a "deleted" flag that is updated to true before
-// the object gets deleted. This is done to keep object metadata in the
-// oplog when deleting the object, as oplog deletion events don't contain
-// any metadata of the object.
-// version 6 also adds the "isPHD" flag that is used to indicate that the master
-// object is a placeholder and is not up to date.
-export const mdModelVersion = 6;
-/*
- * Splitter is used to build the object name for the overview of a
- * multipart upload and to build the object names for each part of a
- * multipart upload.  These objects with large names are then stored in
- * metadata in a "shadow bucket" to a real bucket.  The shadow bucket
- * contains all ongoing multipart uploads.  We include in the object
- * name some of the info we might need to pull about an open multipart
- * upload or about an individual part with each piece of info separated
- * by the splitter.  We can then extract each piece of info by splitting
- * the object name string with this splitter.
- * For instance, assuming a splitter of '...!*!',
- * the name of the upload overview would be:
- *   overview...!*!objectKey...!*!uploadId
- * For instance, the name of a part would be:
- *   uploadId...!*!partNumber
- *
- * The sequence of characters used in the splitter should not occur
- * elsewhere in the pieces of info to avoid splitting where not
- * intended.
- *
- * Splitter is also used in adding bucketnames to the
- * namespacerusersbucket.  The object names added to the
- * namespaceusersbucket are of the form:
- * canonicalID...!*!bucketname
- */
-
-export const splitter = '..|..';
-export const usersBucket = 'users..bucket';
-// MPU Bucket Prefix is used to create the name of the shadow
-// bucket used for multipart uploads.  There is one shadow mpu
-// bucket per bucket and its name is the mpuBucketPrefix followed
-// by the name of the final destination bucket for the object
-// once the multipart upload is complete.
-export const mpuBucketPrefix = 'mpuShadowBucket';
-// since aws s3 does not allow capitalized buckets, these may be
-// used for special internal purposes
-export const permittedCapitalizedBuckets = {
-    METADATA: true,
-};
-// Setting a lower object key limit to account for:
-// - Mongo key limit of 1012 bytes
-// - Version ID in Mongo Key if versioned of 33
-// - Max bucket name length if bucket match false of 63
-// - Extra prefix slash for bucket prefix if bucket match of 1
-export const objectKeyByteLimit = 915;
-/* delimiter for location-constraint. The location constraint will be able
- * to include the ingestion flag
- */
-export const zenkoSeparator = ':';
-/* eslint-disable camelcase */
-export const externalBackends = { aws_s3: true, azure: true, gcp: true, pfs: true };
-export const replicationBackends = { aws_s3: true, azure: true, gcp: true };
-// hex digest of sha256 hash of empty string:
-export const emptyStringHash = crypto.createHash('sha256')
-    .update('', 'binary').digest('hex');
-export const mpuMDStoredExternallyBackend = { aws_s3: true, gcp: true };
-// AWS sets a minimum size limit for parts except for the last part.
-// http://docs.aws.amazon.com/AmazonS3/latest/API/mpUploadComplete.html
-export const minimumAllowedPartSize = 5242880;
-export const gcpMaximumAllowedPartCount = 1024;
-// GCP Object Tagging Prefix
-export const gcpTaggingPrefix = 'aws-tag-';
-export const productName = 'APN/1.0 Scality/1.0 Scality CloudServer for Zenko';
-export const legacyLocations = ['sproxyd', 'legacy'];
-// healthcheck default call from nginx is every 2 seconds
-// for external backends, don't call unless at least 1 minute
-// (60,000 milliseconds) since last call
-export const externalBackendHealthCheckInterval = 60000;
-// some of the available data backends  (if called directly rather
-// than through the multiple backend gateway) need a key provided
-// as a string as first parameter of the get/delete methods.
-export const clientsRequireStringKey = { sproxyd: true, cdmi: true };
-export const hasCopyPartBackends = { aws_s3: true, gcp: true };
-export const versioningNotImplBackends = { azure: true, gcp: true };
-// user metadata applied on zenko-created objects
-export const zenkoIDHeader = 'x-amz-meta-zenko-instance-id';
-// Default expiration value of the S3 pre-signed URL duration
-// 604800 seconds (seven days).
-export const defaultPreSignedURLExpiry = 7 * 24 * 60 * 60;
-// Regex for ISO-8601 formatted date
-export const shortIso8601Regex = /\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}Z/;
-export const longIso8601Regex = /\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}.\d{3}Z/;
-export const supportedNotificationEvents = new Set([
-    's3:ObjectCreated:*',
-    's3:ObjectCreated:Put',
-    's3:ObjectCreated:Copy',
-    's3:ObjectCreated:CompleteMultipartUpload',
-    's3:ObjectRemoved:*',
-    's3:ObjectRemoved:Delete',
-    's3:ObjectRemoved:DeleteMarkerCreated',
-    's3:Replication:OperationFailedReplication',
-    's3:ObjectTagging:*',
-    's3:ObjectTagging:Put',
-    's3:ObjectTagging:Delete',
-    's3:ObjectAcl:Put',
-    's3:ObjectRestore:*',
-    's3:ObjectRestore:Post',
-    's3:ObjectRestore:Completed',
-    's3:ObjectRestore:Delete',
-    's3:LifecycleTransition',
-    's3:LifecycleExpiration:*',
-    's3:LifecycleExpiration:DeleteMarkerCreated',
-    's3:LifecycleExpiration:Delete',
-]);
-export const notificationArnPrefix = 'arn:scality:bucketnotif';
-// HTTP server keep-alive timeout is set to a higher value than
-// client's free sockets timeout to avoid the risk of triggering
-// ECONNRESET errors if the server closes the connection at the
-// exact moment clients attempt to reuse an established connection
-// for a new request.
-//
-// Note: the ability to close inactive connections on the client
-// after httpClientFreeSocketsTimeout milliseconds requires the
-// use of "agentkeepalive" module instead of the regular node.js
-// http.Agent.
-export const httpServerKeepAliveTimeout = 60000;
-export const httpClientFreeSocketTimeout = 55000;
-export const supportedLifecycleRules = [
-    'expiration',
-    'noncurrentVersionExpiration',
-    'abortIncompleteMultipartUpload',
-    'transitions',
-    'noncurrentVersionTransition',
-];
-// Maximum number of buckets to cache (bucket metadata)
-export const maxCachedBuckets = process.env.METADATA_MAX_CACHED_BUCKETS ?
-    Number(process.env.METADATA_MAX_CACHED_BUCKETS) : 1000;
-
-export const validRestoreObjectTiers = new Set(['Expedited', 'Standard', 'Bulk']);
-export const maxBatchingConcurrentOperations = 5;
-
-/** For policy resource arn check we allow empty account ID to not break compatibility */
-export const policyArnAllowedEmptyAccountId = ['utapi', 'scuba'];
--- a/lib/db.js
+++ b/lib/db.js
@ -1,3 +1,7 @@
+'use strict'; // eslint-disable-line strict
+
+const writeOptions = { sync: true };
+
 /**
 * Like Error, but with a property set to true.
 * TODO: this is copied from kineticlib, should consolidate with the
@ -10,36 +14,29 @@
 * use:
 *     throw propError("badTypeInput", "input is not a buffer");
 *
- * @param propName - the property name.
- * @param message - the Error message.
- * @returns the Error object.
+ * @param {String} propName - the property name.
+ * @param {String} message - the Error message.
+ * @returns {Error} the Error object.
 */
-function propError(propName: string, message: string): Error {
+function propError(propName, message) {
    const err = new Error(message);
    err[propName] = true;
-    // @ts-ignore
-    err.is = { [propName]: true };
    return err;
 }

 /**
 * Running transaction with multiple updates to be committed atomically
 */
-export class IndexTransaction {
-    operations: { type: 'put' | 'del'; key: string; value?: any }[];
-    db: any;
-    closed: boolean;
-    conditions: { [key: string]: string }[];
-
+class IndexTransaction {
    /**
     * Builds a new transaction
     *
     * @argument {Leveldb} db an open database to which the updates
     *                     will be applied
     *
-     * @returns a new empty transaction
+     * @returns {IndexTransaction} a new empty transaction
     */
-    constructor(db: any) {
+    constructor(db) {
        this.operations = [];
        this.db = db;
        this.closed = false;
@ -49,34 +46,30 @@ export class IndexTransaction {
    /**
     * Adds a new operation to participate in this running transaction
     *
-     * @argument op an object with the following attributes:
+     * @argument {object} op an object with the following attributes:
     *                    {
     *                      type: 'put' or 'del',
     *                      key: the object key,
     *                      value: (optional for del) the value to store,
     *                    }
     *
-     * @throws an error described by the following properties
+     * @throws {Error} an error described by the following properties
     *                 - invalidTransactionVerb if op is not put or del
     *                 - pushOnCommittedTransaction if already committed
     *                 - missingKey if the key is missing from the op
     *                 - missingValue if putting without a value
+     *
+     * @returns {undefined}
     */
-    push(op: { type: 'put'; key: string; value: any }): void;
-    push(op: { type: 'del'; key: string }): void;
-    push(op: { type: 'put' | 'del'; key: string; value?: any }): void {
+    push(op) {
        if (this.closed) {
-            throw propError(
-                'pushOnCommittedTransaction',
-                'can not add ops to already committed transaction'
-            );
+            throw propError('pushOnCommittedTransaction',
+                            'can not add ops to already committed transaction');
        }

        if (op.type !== 'put' && op.type !== 'del') {
-            throw propError(
-                'invalidTransactionVerb',
-                `unknown action type: ${op.type}`
-            );
+            throw propError('invalidTransactionVerb',
+                            `unknown action type: ${op.type}`);
        }

        if (op.key === undefined) {
@ -100,59 +93,57 @@ export class IndexTransaction {
     *                 - pushOnCommittedTransaction if already committed
     *                 - missingKey if the key is missing from the op
     *                 - missingValue if putting without a value
+     *
+     * @returns {undefined}
+     *
     * @see push
     */
-    put(key: string, value: any) {
+    put(key, value) {
        this.push({ type: 'put', key, value });
    }

    /**
     * Adds a new del operation to this running transaction
     *
-     * @argument key - the key of the object to delete
+     * @argument {string} key - the key of the object to delete
     *
-     * @throws an error described by the following properties
+     * @throws {Error} an error described by the following properties
     *                 - pushOnCommittedTransaction if already committed
     *                 - missingKey if the key is missing from the op
     *
+     * @returns {undefined}
+     *
     * @see push
     */
-    del(key: string) {
+    del(key) {
        this.push({ type: 'del', key });
    }

    /**
     * Adds a condition for the transaction
     *
-     * @argument condition an object with the following attributes:
+     * @argument {object} condition an object with the following attributes:
     *                    {
     *                      <condition>: the object key
     *                    }
     *                    example: { notExists: 'key1' }
     *
-     * @throws an error described by the following properties
+     * @throws {Error} an error described by the following properties
     *                 - pushOnCommittedTransaction if already committed
     *                 - missingCondition if the condition is empty
     *
+     * @returns {undefined}
     */
-    addCondition(condition: { [key: string]: string }) {
+    addCondition(condition) {
        if (this.closed) {
-            throw propError(
-                'pushOnCommittedTransaction',
-                'can not add conditions to already committed transaction'
-            );
+            throw propError('pushOnCommittedTransaction',
+                            'can not add conditions to already committed transaction');
        }
        if (condition === undefined || Object.keys(condition).length === 0) {
-            throw propError(
-                'missingCondition',
-                'missing condition for conditional put'
-            );
+            throw propError('missingCondition', 'missing condition for conditional put');
        }
-        if (typeof condition.notExists !== 'string' && typeof condition.exists !== 'string') {
-            throw propError(
-                'unsupportedConditionalOperation',
-                'missing key or supported condition'
-            );
+        if (typeof (condition.notExists) !== 'string') {
+            throw propError('unsupportedConditionalOperation', 'missing key or supported condition');
        }
        this.conditions.push(condition);
    }
@ -160,35 +151,32 @@ export class IndexTransaction {
    /**
     * Applies the queued updates in this transaction atomically.
     *
-     * @argument cb function to be called when the commit
+     * @argument {function} cb function to be called when the commit
     *              finishes, taking an optional error argument
     *
+     * @returns {undefined}
     */
-    commit(cb: (error: Error | null, data?: any) => void) {
+    commit(cb) {
        if (this.closed) {
-            return cb(
-                propError(
-                    'alreadyCommitted',
-                    'transaction was already committed'
-                )
-            );
+            return cb(propError('alreadyCommitted',
+                                'transaction was already committed'));
        }

        if (this.operations.length === 0) {
-            return cb(
-                propError(
-                    'emptyTransaction',
-                    'tried to commit an empty transaction'
-                )
-            );
+            return cb(propError('emptyTransaction',
+                                'tried to commit an empty transaction'));
        }

        this.closed = true;
-        const options = { sync: true, conditions: this.conditions };
+        writeOptions.conditions = this.conditions;

        // The array-of-operations variant of the `batch` method
        // allows passing options such has `sync: true` whereas the
        // chained form does not.
-        return this.db.batch(this.operations, options, cb);
+        return this.db.batch(this.operations, writeOptions, cb);
    }
 }
+
+module.exports = {
+    IndexTransaction,
+};
--- a/lib/errorUtils.js
+++ b/lib/errorUtils.js
@ -0,0 +1,13 @@
+function reshapeExceptionError(error) {
+    const { message, code, stack, name } = error;
+    return {
+        message,
+        code,
+        stack,
+        name,
+    };
+}
+
+module.exports = {
+    reshapeExceptionError,
+};
--- a/lib/errorUtils.ts
+++ b/lib/errorUtils.ts
@ -1,11 +0,0 @@
-export interface ErrorLike {
-    message: any;
-    code: any;
-    stack: any;
-    name: any;
-}
-
-export function reshapeExceptionError(error: ErrorLike) {
-    const { message, code, stack, name } = error;
-    return { message, code, stack, name };
-}
--- a/lib/errors/arsenalErrors.ts
+++ b/lib/errors/arsenalErrors.ts
@ -42,7 +42,7 @@ export const BucketAlreadyOwnedByYou: ErrorFormat = {
    code: 409,

    description:
-        'A bucket with this name exists and is already owned by you',
+        'Your previous request to create the named bucket succeeded and you already own it. You get this error in all AWS regions except US Standard, us-east-1. In us-east-1 region, you will get 200 OK, but it is no-op (if bucket exists S3 will not do anything).',
 };

 export const BucketNotEmpty: ErrorFormat = {
@ -365,11 +365,6 @@ export const NoSuchWebsiteConfiguration: ErrorFormat = {
    description: 'The specified bucket does not have a website configuration',
 };

-export const NoSuchTagSet: ErrorFormat = {
-    code: 404,
-    description: 'The TagSet does not exist',
-};
-
 export const NoSuchUpload: ErrorFormat = {
    code: 404,
    description:
@ -690,11 +685,6 @@ export const ReportNotPresent: ErrorFormat = {
        'The request was rejected because the credential report does not exist. To generate a credential report, use GenerateCredentialReport.',
 };

-export const Found: ErrorFormat = {
-    code: 302,
-    description: 'Resource Found'
-};
-
 // ------------- Special non-AWS S3 errors -------------

 export const MPUinProgress: ErrorFormat = {
@ -1042,15 +1032,3 @@ export const AuthMethodNotImplemented: ErrorFormat = {
    description: 'AuthMethodNotImplemented',
    code: 501,
 };
-
-// --------------------- quotaErros ---------------------
-
-export const NoSuchQuota: ErrorFormat = {
-    code: 404,
-    description: 'The specified resource does not have a quota.',
-};
-
-export const QuotaExceeded: ErrorFormat = {
-    code: 429,
-    description: 'The quota set for the resource is exceeded.',
-};
--- a/lib/errors/index.ts
+++ b/lib/errors/index.ts
@ -2,7 +2,7 @@ import type { ServerResponse } from 'http';
 import * as rawErrors from './arsenalErrors';

 /** All possible errors names. */
-export type Name = keyof typeof rawErrors;
+export type Name = keyof typeof rawErrors
 /** Object containing all errors names. It has the format { [Name]: "Name" } */
 export type Names = { [Name_ in Name]: Name_ };
 /** Mapping used to determine an error type. It has the format { [Name]: boolean } */
@ -13,16 +13,9 @@ export type Errors = { [_ in Name]: ArsenalError };
 // This object is reused constantly through createIs, we store it there
 // to avoid recomputation.
 const isBase = Object.fromEntries(
-    Object.keys(rawErrors).map((key) => [key, false])
+    Object.keys(rawErrors).map(key => [key, false])
 ) as Is;

-// This allows to conditionally add the old behavior of errors to properly
-// test migration.
-// Activate CI tests with `ALLOW_UNSAFE_ERROR_COMPARISON=false yarn test`.
-// Remove this mechanism in ARSN-176.
-export const allowUnsafeErrComp = (
-    process.env.ALLOW_UNSAFE_ERROR_COMPARISON ?? 'true') === 'true'
-
 // This contains some metaprog. Be careful.
 // Proxy can be found on MDN.
 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy
@ -32,7 +25,7 @@ export const allowUnsafeErrComp = (
 // the Proxy will return false.
 const createIs = (type: Name): Is => {
    const get = (is: Is, value: string | symbol) => is[value] ?? false;
-    const final = Object.freeze({ ...isBase, [type]: true });
+    const final = Object.freeze({ ...isBase, [type]: true })
    return new Proxy(final, { get });
 };

@ -46,27 +39,13 @@ export class ArsenalError extends Error {
    /** Object used to determine the error type.
     * Example: error.is.InternalError */
    #is: Is;
-    /** A map of error metadata (can be extra fields
-     * that only show in debug mode) */
-    #metadata: Map<string, Object[]>;

-    private constructor(type: Name, code: number, description: string,
-        metadata?: Map<string, Object[]>) {
+    private constructor(type: Name, code: number, description: string) {
        super(type);
        this.#code = code;
        this.#description = description;
        this.#type = type;
        this.#is = createIs(type);
-        this.#metadata = metadata ?? new Map<string, Object[]>();
-
-        // This restores the old behavior of errors, to make sure they're now
-        // backward-compatible. Fortunately it's handled by TS, but it cannot
-        // be type-checked. This means we have to be extremely careful about
-        // what we're doing when using errors.
-        // Disables the feature when in CI tests but not in production.
-        if (allowUnsafeErrComp) {
-            this[type] = true;
-        }
    }

    /** Output the error as a JSON string */
@ -76,30 +55,6 @@ export class ArsenalError extends Error {
        return JSON.stringify({ errorType, errorMessage });
    }

-    flatten() {
-        return {
-            is_arsenal_error: true,
-            code: this.#code,
-            description: this.#description,
-            type: this.#type,
-            stack: this.stack
-        }
-    }
-
-    static unflatten(flat_obj) {
-        if (!flat_obj.is_arsenal_error) {
-            return null;
-        }
-
-        const err = new ArsenalError(
-            flat_obj.type,
-            flat_obj.code,
-            flat_obj.description
-        )
-        err.stack = flat_obj.stack
-        return err;
-    }
-
    /** Write the error in an HTTP response */
    writeResponse(res: ServerResponse) {
        res.writeHead(this.#code);
@ -111,22 +66,7 @@ export class ArsenalError extends Error {
    customizeDescription(description: string): ArsenalError {
        const type = this.#type;
        const code = this.#code;
-        const metadata = new Map(this.#metadata);
-        const err = new ArsenalError(type, code, description, metadata);
-        err.stack = this.stack;
-        return err;
-    }
-
-    /** Clone the error with a new metadata field */
-    addMetadataEntry(key: string, value: Object[]): ArsenalError {
-        const type = this.#type;
-        const code = this.#code;
-        const description = this.#description;
-        const metadata = new Map(this.#metadata);
-        metadata.set(key, value);
-        const err = new ArsenalError(type, code, description, metadata);
-        err.stack = this.stack;
-        return err;
+        return new ArsenalError(type, code, description);
    }

    /** Used to determine the error type. Example: error.is.InternalError */
@ -151,14 +91,9 @@ export class ArsenalError extends Error {
        return this.#type;
    }

-    /** A map of error metadata */
-    get metadata() {
-        return this.#metadata;
-    }
-
    /** Generate all possible errors. An instance is created by default. */
    static errors() {
-        const errors = {};
+        const errors = {}
        Object.entries(rawErrors).forEach((value) => {
            const name = value[0] as Name;
            const error = value[1];
@ -166,7 +101,7 @@ export class ArsenalError extends Error {
            const get = () => new ArsenalError(name, code, description);
            Object.defineProperty(errors, name, { get });
        });
-        return errors as Errors;
+        return errors as Errors
    }
 }

--- a/lib/executables/pensieveCreds/package.json
+++ b/lib/executables/pensieveCreds/package.json
@ -7,8 +7,8 @@
    "test": "mocha --recursive --timeout 5500 tests/unit"
  },
  "dependencies": {
-    "mocha": "5.2.0",
-    "async": "~2.6.1",
+    "mocha": "2.5.3",
+    "async": "^2.6.0",
    "node-forge": "^0.7.1"
  }
 }
--- a/lib/https/ciphers.js
+++ b/lib/https/ciphers.js
@ -1,4 +1,6 @@
-export const ciphers = [
+'use strict'; // eslint-disable-line strict
+
+const ciphers = [
    'DHE-RSA-AES128-GCM-SHA256',
    'ECDHE-ECDSA-AES128-GCM-SHA256',
    'ECDHE-RSA-AES256-GCM-SHA384',
@ -26,3 +28,7 @@ export const ciphers = [
    '!EDH-RSA-DES-CBC3-SHA',
    '!KRB5-DES-CBC3-SHA',
 ].join(':');
+
+module.exports = {
+    ciphers,
+};
--- a/lib/https/dh2048.js
+++ b/lib/https/dh2048.js
@ -29,11 +29,16 @@ c2CNfUEqyRbJF4pE9ZcdQReT5p/llmyhQdvq6cHH+cKJk63C6DHRVoStsnsUcvKe
 bLxKsygK77ttjr61cxLoDJeGd5L5h1CPmwIBAg==
 -----END DH PARAMETERS-----
 */
+'use strict'; // eslint-disable-line strict

-export const dhparam =
+const dhparam =
    'MIIBCAKCAQEAh99T77KGNuiY9N6xrCJ3QNv4SFADTa3CD+1VMTAdRJLHUNpglB+i' +
    'AoTYiLDFZgtTCpx0ZZUD+JM3qiCZy0OK5/ZGlVD7sZmxjRtdpVK4qIPtwav8t0J7' +
    'c2CNfUEqyRbJF4pE9ZcdQReT5p/llmyhQdvq6cHH+cKJk63C6DHRVoStsnsUcvKe' +
    '23PLGZulKg8H3eRBxHamHkmyuEVDtoNhMIoJONsdXSpo5GgcD4EQMM8xb/qsnCxn' +
    '6QIGTBvcHskxtlTZOfUPk4XQ6Yb3tQi2TurzkQHLln4U7p/GZs+D+6D3SgSPqr6P' +
    'bLxKsygK77ttjr61cxLoDJeGd5L5h1CPmwIBAg==';
+
+module.exports = {
+    dhparam,
+};
--- a/lib/https/index.ts
+++ b/lib/https/index.ts
@ -1,2 +0,0 @@
-export * as ciphers from './ciphers'
-export * as dhparam from './dh2048'
--- a/lib/ipCheck.js
+++ b/lib/ipCheck.js
@ -0,0 +1,83 @@
+'use strict'; // eslint-disable-line strict
+
+const ipaddr = require('ipaddr.js');
+
+/**
+ * checkIPinRangeOrMatch checks whether a given ip address is in an ip address
+ * range or matches the given ip address
+ * @param {string} cidr - ip address range or ip address
+ * @param {object} ip - parsed ip address
+ * @return {boolean} true if in range, false if not
+ */
+function checkIPinRangeOrMatch(cidr, ip) {
+    // If there is an exact match of the ip address, no need to check ranges
+    if (ip.toString() === cidr) {
+        return true;
+    }
+    let range;
+
+    try {
+        range = ipaddr.IPv4.parseCIDR(cidr);
+    } catch (err) {
+        try {
+        // not ipv4 so try ipv6
+            range = ipaddr.IPv6.parseCIDR(cidr);
+        } catch (err) {
+            // range is not valid ipv4 or ipv6
+            return false;
+        }
+    }
+    try {
+        return ip.match(range);
+    } catch (err) {
+        return false;
+    }
+}
+
+/**
+* Parse IP address into object representation
+* @param {string} ip - IPV4/IPV6/IPV4-mapped IPV6 address
+* @return {object} parsedIp - Object representation of parsed IP
+*/
+function parseIp(ip) {
+    if (ipaddr.IPv4.isValid(ip)) {
+        return ipaddr.parse(ip);
+    }
+    if (ipaddr.IPv6.isValid(ip)) {
+        // also parses IPv6 mapped IPv4 addresses into IPv4 representation
+        return ipaddr.process(ip);
+    }
+    // not valid ip address according to module, so return empty object
+    // which will obviously not match a range of ip addresses that the parsedIp
+    // is being tested against
+    return {};
+}
+
+
+/**
+* Checks if an IP adress matches a given list of CIDR ranges
+* @param {string[]} cidrList - List of CIDR ranges
+* @param {string} ip - IP address
+* @return {boolean} - true if there is match or false for no match
+*/
+function ipMatchCidrList(cidrList, ip) {
+    const parsedIp = parseIp(ip);
+    return cidrList.some(item => {
+        let cidr;
+        // patch the cidr if range is not specified
+        if (item.indexOf('/') === -1) {
+            if (item.startsWith('127.')) {
+                cidr = `${item}/8`;
+            } else if (ipaddr.IPv4.isValid(item)) {
+                cidr = `${item}/32`;
+            }
+        }
+        return checkIPinRangeOrMatch(cidr || item, parsedIp);
+    });
+}
+
+module.exports = {
+    checkIPinRangeOrMatch,
+    ipMatchCidrList,
+    parseIp,
+};
--- a/lib/ipCheck.ts
+++ b/lib/ipCheck.ts
@ -1,71 +0,0 @@
-import ipaddr from 'ipaddr.js';
-
-/**
- * checkIPinRangeOrMatch checks whether a given ip address is in an ip address
- * range or matches the given ip address
- * @param cidr - ip address range or ip address
- * @param ip - parsed ip address
- * @return true if in range, false if not
- */
-export function checkIPinRangeOrMatch(
-    cidr: string,
-    ip: ipaddr.IPv4 | ipaddr.IPv6,
-): boolean {
-    // If there is an exact match of the ip address, no need to check ranges
-    if (ip.toString() === cidr) {
-        return true;
-    }
-    try {
-        if (ip instanceof ipaddr.IPv6) {
-            const range = ipaddr.IPv6.parseCIDR(cidr);
-            return ip.match(range);
-        } else {
-            const range = ipaddr.IPv4.parseCIDR(cidr);
-            return ip.match(range);
-        }
-    } catch (error) {
-        return false;
-    }
-}
-
-/**
- * Parse IP address into object representation
- * @param ip - IPV4/IPV6/IPV4-mapped IPV6 address
- * @return parsedIp - Object representation of parsed IP
- */
-export function parseIp(ip: string): ipaddr.IPv4 | ipaddr.IPv6 | {} {
-    if (ipaddr.IPv4.isValid(ip)) {
-        return ipaddr.parse(ip);
-    }
-    if (ipaddr.IPv6.isValid(ip)) {
-        // also parses IPv6 mapped IPv4 addresses into IPv4 representation
-        return ipaddr.process(ip);
-    }
-    return {};
-}
-
-/**
- * Checks if an IP adress matches a given list of CIDR ranges
- * @param cidrList - List of CIDR ranges
- * @param ip - IP address
- * @return - true if there is match or false for no match
- */
-export function ipMatchCidrList(cidrList: string[], ip: string): boolean {
-    const parsedIp = parseIp(ip);
-    return cidrList.some((item) => {
-        let cidr: string | undefined;
-        // patch the cidr if range is not specified
-        if (item.indexOf('/') === -1) {
-            if (item.startsWith('127.')) {
-                cidr = `${item}/8`;
-            } else if (ipaddr.IPv4.isValid(item)) {
-                cidr = `${item}/32`;
-            }
-        }
-        return (
-            (parsedIp instanceof ipaddr.IPv4 ||
-                parsedIp instanceof ipaddr.IPv6) &&
-            checkIPinRangeOrMatch(cidr || item, parsedIp)
-        );
-    });
-}
--- a/lib/jsutil.js
+++ b/lib/jsutil.js
@ -0,0 +1,32 @@
+'use strict'; // eslint-disable-line
+
+const debug = require('util').debuglog('jsutil');
+
+// JavaScript utility functions
+
+/**
+ * force <tt>func</tt> to be called only once, even if actually called
+ * multiple times. The cached result of the first call is then
+ * returned (if any).
+ *
+ * @note underscore.js provides this functionality but not worth
+ * adding a new dependency for such a small use case.
+ *
+ * @param {function} func function to call at most once
+
+ * @return {function} a callable wrapper mirroring <tt>func</tt> but
+ * only calls <tt>func</tt> at first invocation.
+ */
+module.exports.once = function once(func) {
+    const state = { called: false, res: undefined };
+    return function wrapper(...args) {
+        if (!state.called) {
+            state.called = true;
+            state.res = func.apply(func, args);
+        } else {
+            debug('function already called:', func,
+                  'returning cached result:', state.res);
+        }
+        return state.res;
+    };
+};
--- a/lib/jsutil.ts
+++ b/lib/jsutil.ts
@ -1,33 +0,0 @@
-import * as util from 'util';
-const debug = util.debuglog('jsutil');
-
-// JavaScript utility functions
-
-/**
- * force <tt>func</tt> to be called only once, even if actually called
- * multiple times. The cached result of the first call is then
- * returned (if any).
- *
- * @note underscore.js provides this functionality but not worth
- * adding a new dependency for such a small use case.
- *
- * @param func function to call at most once
-
- * @return a callable wrapper mirroring <tt>func</tt> but
- * only calls <tt>func</tt> at first invocation.
- */
-export function once<T>(func: (...args: any[]) => T): (...args: any[]) => T {
-    type State = { called: boolean; res: any };
-    const state: State = { called: false, res: undefined };
-    return function wrapper(...args: any[]) {
-        if (!state.called) {
-            state.called = true;
-            state.res = func.apply(func, args);
-        } else {
-            const m1 = 'function already called:';
-            const m2 = 'returning cached result:';
-            debug(m1, func, m2, state.res);
-        }
-        return state.res;
-    };
-}
--- a/lib/metrics/RedisClient.js
+++ b/lib/metrics/RedisClient.js
@ -0,0 +1,162 @@
+const Redis = require('ioredis');
+
+class RedisClient {
+    /**
+    * @constructor
+    * @param {Object} config - config
+    * @param {string} config.host - Redis host
+    * @param {number} config.port - Redis port
+    * @param {string} config.password - Redis password
+    * @param {werelogs.Logger} logger - logger instance
+    */
+    constructor(config, logger) {
+        this._client = new Redis(config);
+        this._client.on('error', err =>
+            logger.trace('error from redis', {
+                error: err,
+                method: 'RedisClient.constructor',
+                redisHost: config.host,
+                redisPort: config.port,
+            })
+        );
+        return this;
+    }
+
+    /**
+    * increment value of a key by 1 and set a ttl
+    * @param {string} key - key holding the value
+    * @param {number} expiry - expiry in seconds
+    * @param {callback} cb - callback
+    * @return {undefined}
+    */
+    incrEx(key, expiry, cb) {
+        return this._client
+            .multi([['incr', key], ['expire', key, expiry]])
+            .exec(cb);
+    }
+
+    /**
+     * increment value of a key by a given amount and set a ttl
+     * @param {string} key - key holding the value
+     * @param {number} amount - amount to increase by
+     * @param {number} expiry - expiry in seconds
+     * @param {callback} cb - callback
+     * @return {undefined}
+     */
+    incrbyEx(key, amount, expiry, cb) {
+        return this._client
+            .multi([['incrby', key, amount], ['expire', key, expiry]])
+            .exec(cb);
+    }
+
+    /**
+    * execute a batch of commands
+    * @param {string[]} cmds - list of commands
+    * @param {callback} cb - callback
+    * @return {undefined}
+    */
+    batch(cmds, cb) {
+        return this._client.pipeline(cmds).exec(cb);
+    }
+
+    /**
+     * Checks if a key exists
+     * @param {string} key - name of key
+     * @param {function} cb - callback
+     *   If cb response returns 0, key does not exist.
+     *   If cb response returns 1, key exists.
+     * @return {undefined}
+     */
+    exists(key, cb) {
+        return this._client.exists(key, cb);
+    }
+
+    /**
+     * Add a value and its score to a sorted set. If no sorted set exists, this
+     * will create a new one for the given key.
+     * @param {string} key - name of key
+     * @param {integer} score - score used to order set
+     * @param {string} value - value to store
+     * @param {callback} cb - callback
+     * @return {undefined}
+     */
+    zadd(key, score, value, cb) {
+        return this._client.zadd(key, score, value, cb);
+    }
+
+    /**
+     * Get number of elements in a sorted set.
+     * Note: using this on a key that does not exist will return 0.
+     * Note: using this on an existing key that isn't a sorted set will
+     * return an error WRONGTYPE.
+     * @param {string} key - name of key
+     * @param {function} cb - callback
+     * @return {undefined}
+     */
+    zcard(key, cb) {
+        return this._client.zcard(key, cb);
+    }
+
+    /**
+     * Get the score for given value in a sorted set
+     * Note: using this on a key that does not exist will return nil.
+     * Note: using this on a value that does not exist in a valid sorted set key
+     *       will return nil.
+     * @param {string} key - name of key
+     * @param {string} value - value within sorted set
+     * @param {function} cb - callback
+     * @return {undefined}
+     */
+    zscore(key, value, cb) {
+        return this._client.zscore(key, value, cb);
+    }
+
+    /**
+     * Remove a value from a sorted set
+     * @param {string} key - name of key
+     * @param {string|array} value - value within sorted set. Can specify
+     *   multiple values within an array
+     * @param {function} cb - callback
+     *   The cb response returns number of values removed
+     * @return {undefined}
+     */
+    zrem(key, value, cb) {
+        return this._client.zrem(key, value, cb);
+    }
+
+    /**
+     * Get specified range of elements in a sorted set
+     * @param {string} key - name of key
+     * @param {integer} start - start index (inclusive)
+     * @param {integer} end - end index (inclusive) (can use -1)
+     * @param {function} cb - callback
+     * @return {undefined}
+     */
+    zrange(key, start, end, cb) {
+        return this._client.zrange(key, start, end, cb);
+    }
+
+    /**
+     * Get range of elements in a sorted set based off score
+     * @param {string} key - name of key
+     * @param {integer|string} min - min score value (inclusive)
+     *   (can use "-inf")
+     * @param {integer|string} max - max score value (inclusive)
+     *   (can use "+inf")
+     * @param {function} cb - callback
+     * @return {undefined}
+     */
+    zrangebyscore(key, min, max, cb) {
+        return this._client.zrangebyscore(key, min, max, cb);
+    }
+
+    clear(cb) {
+        return this._client.flushdb(cb);
+    }
+
+    disconnect() {
+        this._client.disconnect();
+    }
+}
+
+module.exports = RedisClient;
--- a/lib/metrics/RedisClient.ts
+++ b/lib/metrics/RedisClient.ts
@ -1,218 +0,0 @@
-import Redis from 'ioredis';
-import { Logger } from 'werelogs';
-
-export type Config = { host: string; port: number; password: string };
-export type Callback = (error: Error | null, value?: any) => void;
-
-export default class RedisClient {
-    _client: Redis.Redis;
-
-    constructor(config: Config, logger: Logger) {
-        this._client = new Redis(config);
-        this._client.on('error', err =>
-            logger.trace('error from redis', {
-                error: err,
-                method: 'RedisClient.constructor',
-                redisHost: config.host,
-                redisPort: config.port,
-            })
-        );
-        return this;
-    }
-
-    /**
-    * scan a pattern and return matching keys
-    * @param pattern - string pattern to match with all existing keys
-    * @param [count=10] - scan count
-    * @param cb - callback (error, result)
-    */
-    scan(pattern: string, count = 10, cb: Callback) {
-        const params = { match: pattern, count };
-        const keys: any[] = [];
-
-        const stream = this._client.scanStream(params);
-        stream.on('data', resultKeys => {
-            for (let i = 0; i < resultKeys.length; i++) {
-                keys.push(resultKeys[i]);
-            }
-        });
-        stream.on('end', () => {
-            cb(null, keys);
-        });
-    }
-
-    /** increment value of a key by 1 and set a ttl
-     * @param key - key holding the value
-     * @param expiry - expiry in seconds
-     * @param cb - callback
-     */
-    incrEx(key: string, expiry: number, cb: Callback) {
-        const exp = expiry.toString();
-        return this._client
-            .multi([['incr', key], ['expire', key, exp]])
-            .exec(cb);
-    }
-
-    /**
-     * increment value of a key by a given amount
-     * @param key - key holding the value
-     * @param amount - amount to increase by
-     * @param cb - callback
-     */
-    incrby(key: string, amount: number, cb: Callback) {
-        return this._client.incrby(key, amount, cb);
-    }
-
-    /** increment value of a key by a given amount and set a ttl
-     * @param key - key holding the value
-     * @param amount - amount to increase by
-     * @param expiry - expiry in seconds
-     * @param cb - callback
-     */
-    incrbyEx(key: string, amount: number, expiry: number, cb: Callback) {
-        const am = amount.toString();
-        const exp = expiry.toString();
-        return this._client
-            .multi([['incrby', key, am], ['expire', key, exp]])
-            .exec(cb);
-    }
-
-    /**
-     * decrement value of a key by a given amount
-     * @param key - key holding the value
-     * @param amount - amount to increase by
-     * @param cb - callback
-     */
-    decrby(key: string, amount: number, cb: Callback) {
-        return this._client.decrby(key, amount, cb);
-    }
-
-    /**
-    * execute a batch of commands
-    * @param cmds - list of commands
-    * @param cb - callback
-    * @return
-    */
-    batch(cmds: string[][], cb: Callback) {
-        return this._client.pipeline(cmds).exec(cb);
-    }
-
-    /**
-     * Checks if a key exists
-     * @param key - name of key
-     * @param cb - callback
-     *   If cb response returns 0, key does not exist.
-     *   If cb response returns 1, key exists.
-     */
-    exists(key: string, cb: Callback) {
-        return this._client.exists(key, cb);
-    }
-
-    /**
-     * get value stored at key
-     * @param key - key holding the value
-     * @param cb - callback
-     */
-    get(key: string, cb: Callback) {
-        return this._client.get(key, cb);
-    }
-
-    /**
-     * Add a value and its score to a sorted set. If no sorted set exists, this
-     * will create a new one for the given key.
-     * @param key - name of key
-     * @param score - score used to order set
-     * @param value - value to store
-     * @param cb - callback
-     */
-    zadd(key: string, score: number, value: string, cb: Callback) {
-        return this._client.zadd(key, score, value, cb);
-    }
-
-    /**
-     * Get number of elements in a sorted set.
-     * Note: using this on a key that does not exist will return 0.
-     * Note: using this on an existing key that isn't a sorted set will
-     * return an error WRONGTYPE.
-     * @param key - name of key
-     * @param cb - callback
-     */
-    zcard(key: string, cb: Callback) {
-        return this._client.zcard(key, cb);
-    }
-
-    /**
-     * Get the score for given value in a sorted set
-     * Note: using this on a key that does not exist will return nil.
-     * Note: using this on a value that does not exist in a valid sorted set key
-     *       will return nil.
-     * @param key - name of key
-     * @param value - value within sorted set
-     * @param cb - callback
-     */
-     zscore(key: string, value: string, cb: Callback) {
-        return this._client.zscore(key, value, cb);
-    }
-
-    /**
-     * Remove a value from a sorted set
-     * @param key - name of key
-     * @param value - value within sorted set. Can specify
-     *   multiple values within an array
-     * @param cb - callback
-     *   The cb response returns number of values removed
-     */
-    zrem(key: string, value: string | string[], cb: Callback) {
-        return this._client.zrem(key, value, cb);
-    }
-
-    /**
-     * Get specified range of elements in a sorted set
-     * @param key - name of key
-     * @param start - start index (inclusive)
-     * @param end - end index (inclusive) (can use -1)
-     * @param cb - callback
-     */
-    zrange(key: string, start: number, end: number, cb: Callback) {
-        return this._client.zrange(key, start, end, cb);
-    }
-
-    /**
-     * Get range of elements in a sorted set based off score
-     * @param key - name of key
-     * @param min - min score value (inclusive)
-     *   (can use "-inf")
-     * @param max - max score value (inclusive)
-     *   (can use "+inf")
-     * @param cb - callback
-     */
-    zrangebyscore(
-        key: string,
-        min: number | string,
-        max: number | string,
-        cb: Callback,
-    ) {
-        return this._client.zrangebyscore(key, min, max, cb);
-    }
-
-    /**
-     * get TTL or expiration in seconds
-     * @param key - name of key
-     * @param cb - callback
-     */
-    ttl(key: string, cb: Callback) {
-        return this._client.ttl(key, cb);
-    }
-
-    clear(cb: Callback) {
-        return this._client.flushdb(cb);
-    }
-
-    disconnect() {
-        this._client.disconnect();
-    }
-
-    listClients(cb: Callback) {
-        return this._client.client('list', cb);
-    }
-}
--- a/lib/metrics/StatsClient.js
+++ b/lib/metrics/StatsClient.js
@ -0,0 +1,163 @@
+const async = require('async');
+
+class StatsClient {
+    /**
+    * @constructor
+    * @param {object} redisClient - RedisClient instance
+    * @param {number} interval - sampling interval by seconds
+    * @param {number} expiry - sampling duration by seconds
+    */
+    constructor(redisClient, interval, expiry) {
+        this._redis = redisClient;
+        this._interval = interval;
+        this._expiry = expiry;
+        return this;
+    }
+
+    /*
+    * Utility function to use when callback is undefined
+    */
+    _noop() {}
+
+    /**
+    * normalize to the nearest interval
+    * @param {object} d - Date instance
+    * @return {number} timestamp - normalized to the nearest interval
+    */
+    _normalizeTimestamp(d) {
+        const s = d.getSeconds();
+        return d.setSeconds(s - s % this._interval, 0);
+    }
+
+    /**
+    * set timestamp to the previous interval
+    * @param {object} d - Date instance
+    * @return {number} timestamp - set to the previous interval
+    */
+    _setPrevInterval(d) {
+        return d.setSeconds(d.getSeconds() - this._interval);
+    }
+
+    /**
+    * build redis key to get total number of occurrences on the server
+    * @param {string} name - key name identifier
+    * @param {object} d - Date instance
+    * @return {string} key - key for redis
+    */
+    _buildKey(name, d) {
+        return `${name}:${this._normalizeTimestamp(d)}`;
+    }
+
+    /**
+    * reduce the array of values to a single value
+    * typical input looks like [[null, '1'], [null, '2'], [null, null]...]
+    * @param {array} arr - Date instance
+    * @return {string} key - key for redis
+    */
+    _getCount(arr) {
+        return arr.reduce((prev, a) => {
+            let num = parseInt(a[1], 10);
+            num = Number.isNaN(num) ? 0 : num;
+            return prev + num;
+        }, 0);
+    }
+
+    /**
+    * report/record a new request received on the server
+    * @param {string} id - service identifier
+    * @param {number} incr - optional param increment
+    * @param {function} cb - callback
+    * @return {undefined}
+    */
+    reportNewRequest(id, incr, cb) {
+        if (!this._redis) {
+            return undefined;
+        }
+
+        let callback;
+        let amount;
+        if (typeof incr === 'function') {
+            // In case where optional `incr` is not passed, but `cb` is passed
+            callback = incr;
+            amount = 1;
+        } else {
+            callback = (cb && typeof cb === 'function') ? cb : this._noop;
+            amount = (typeof incr === 'number') ? incr : 1;
+        }
+
+        const key = this._buildKey(`${id}:requests`, new Date());
+
+        return this._redis.incrbyEx(key, amount, this._expiry, callback);
+    }
+
+    /**
+    * report/record a request that ended up being a 500 on the server
+    * @param {string} id - service identifier
+    * @param {callback} cb - callback
+    * @return {undefined}
+    */
+    report500(id, cb) {
+        if (!this._redis) {
+            return undefined;
+        }
+        const callback = cb || this._noop;
+        const key = this._buildKey(`${id}:500s`, new Date());
+        return this._redis.incrEx(key, this._expiry, callback);
+    }
+
+    /**
+    * get stats for the last x seconds, x being the sampling duration
+    * @param {object} log - Werelogs request logger
+    * @param {string} id - service identifier
+    * @param {callback} cb - callback to call with the err/result
+    * @return {undefined}
+    */
+    getStats(log, id, cb) {
+        if (!this._redis) {
+            return cb(null, {});
+        }
+        const d = new Date();
+        const totalKeys = Math.floor(this._expiry / this._interval);
+        const reqsKeys = [];
+        const req500sKeys = [];
+        for (let i = 0; i < totalKeys; i++) {
+            reqsKeys.push(['get', this._buildKey(`${id}:requests`, d)]);
+            req500sKeys.push(['get', this._buildKey(`${id}:500s`, d)]);
+            this._setPrevInterval(d);
+        }
+        return async.parallel([
+            next => this._redis.batch(reqsKeys, next),
+            next => this._redis.batch(req500sKeys, next),
+        ], (err, results) => {
+            /**
+            * Batch result is of the format
+            * [ [null, '1'], [null, '2'], [null, '3'] ] where each
+            * item is the result of the each batch command
+            * Foreach item in the result, index 0 signifies the error and
+            * index 1 contains the result
+            */
+            const statsRes = {
+                'requests': 0,
+                '500s': 0,
+                'sampleDuration': this._expiry,
+            };
+            if (err) {
+                log.error('error getting stats', {
+                    error: err,
+                    method: 'StatsClient.getStats',
+                });
+                /**
+                * Redis for stats is not a critial component, ignoring
+                * any error here as returning an InternalError
+                * would be confused with the health of the service
+                */
+                return cb(null, statsRes);
+            }
+            statsRes.requests = this._getCount(results[0]);
+            statsRes['500s'] = this._getCount(results[1]);
+            return cb(null, statsRes);
+        });
+    }
+}
+
+module.exports = StatsClient;
--- a/lib/metrics/StatsClient.ts
+++ b/lib/metrics/StatsClient.ts
@ -1,230 +0,0 @@
-import async from 'async';
-import RedisClient from './RedisClient';
-import { Logger } from 'werelogs';
-
-export type Callback = (error: Error | null, value?: any) => void;
-
-export default class StatsClient {
-    _redis: RedisClient;
-    _interval: number;
-    _expiry: number;
-
-    /**
-    * @constructor
-    * @param redisClient - RedisClient instance
-    * @param interval - sampling interval by seconds
-    * @param expiry - sampling duration by seconds
-    */
-    constructor(redisClient: RedisClient, interval: number, expiry: number) {
-        this._redis = redisClient;
-        this._interval = interval;
-        this._expiry = expiry;
-        return this;
-    }
-
-    /** Utility function to use when callback is undefined */
-    _noop() {}
-
-    /**
-    * normalize to the nearest interval
-    * @param d - Date instance
-    * @return timestamp - normalized to the nearest interval
-    */
-    _normalizeTimestamp(d: Date): number {
-        const s = d.getSeconds();
-        return d.setSeconds(s - s % this._interval, 0);
-    }
-
-    /**
-    * set timestamp to the previous interval
-    * @param d - Date instance
-    * @return timestamp - set to the previous interval
-    */
-    _setPrevInterval(d: Date): number {
-        return d.setSeconds(d.getSeconds() - this._interval);
-    }
-
-    /**
-    * build redis key to get total number of occurrences on the server
-    * @param name - key name identifier
-    * @param d - Date instance
-    * @return key - key for redis
-    */
-    buildKey(name: string, d: Date): string {
-        return `${name}:${this._normalizeTimestamp(d)}`;
-    }
-
-    /**
-    * reduce the array of values to a single value
-    * typical input looks like [[null, '1'], [null, '2'], [null, null]...]
-    * @param arr - Date instance
-    * @return key - key for redis
-    */
-    _getCount(arr: [any, string | null][]): number {
-        return arr.reduce((prev, a) => {
-            let num = parseInt(a[1] ?? '', 10);
-            num = Number.isNaN(num) ? 0 : num;
-            return prev + num;
-        }, 0);
-    }
-
-    /**
-    * report/record a new request received on the server
-    * @param id - service identifier
-    * @param incr - optional param increment
-    */
-    reportNewRequest(
-        id: string,
-        incr?: number | ((error: Error | null, value?: any) => void),
-        cb?: (error: Error | null, value?: any) => void,
-    ) {
-        if (!this._redis) {
-            return undefined;
-        }
-
-        let callback: (error: Error | null, value?: any) => void;
-        let amount: number;
-        if (typeof incr === 'function') {
-            // In case where optional `incr` is not passed, but `cb` is passed
-            callback = incr;
-            amount = 1;
-        } else {
-            callback = (cb && typeof cb === 'function') ? cb : this._noop;
-            amount = (typeof incr === 'number') ? incr : 1;
-        }
-
-        const key = this.buildKey(`${id}:requests`, new Date());
-
-        return this._redis.incrbyEx(key, amount, this._expiry, callback);
-    }
-
-    /**
-     * Increment the given key by the given value.
-     * @param key - The Redis key to increment
-     * @param incr - The value to increment by
-     * @param [cb] - callback
-     */
-    incrementKey(key: string, incr: number, cb: Callback) {
-        const callback = cb || this._noop;
-        return this._redis.incrby(key, incr, callback);
-    }
-
-    /**
-     * Decrement the given key by the given value.
-     * @param key - The Redis key to decrement
-     * @param decr - The value to decrement by
-     * @param [cb] - callback
-     */
-    decrementKey(key: string, decr: number, cb: Callback) {
-        const callback = cb || this._noop;
-        return this._redis.decrby(key, decr, callback);
-    }
-
-    /**
-    * report/record a request that ended up being a 500 on the server
-    * @param id - service identifier
-    */
-    report500(id: string, cb?: (error: Error | null, value?: any) => void) {
-        if (!this._redis) {
-            return undefined;
-        }
-        const callback = cb || this._noop;
-        const key = this.buildKey(`${id}:500s`, new Date());
-        return this._redis.incrEx(key, this._expiry, callback);
-    }
-
-    /**
-    * wrapper on `getStats` that handles a list of keys
-    * @param log - Werelogs request logger
-    * @param ids - service identifiers
-    * @param cb - callback to call with the err/result
-    */
-    getAllStats(log: Logger, ids: string[], cb: Callback) {
-        if (!this._redis) {
-            return cb(null, {});
-        }
-
-        const statsRes = {
-            'requests': 0,
-            '500s': 0,
-            'sampleDuration': this._expiry,
-        };
-        let requests = 0;
-        let errors = 0;
-
-        // for now set concurrency to default of 10
-        return async.eachLimit(ids, 10, (id: string, done) => {
-            this.getStats(log, id, (err, res) => {
-                if (err) {
-                    return done(err);
-                }
-                requests += res.requests;
-                errors += res['500s'];
-                return done();
-            });
-        }, error => {
-            if (error) {
-                log.error('error getting stats', {
-                    error,
-                    method: 'StatsClient.getAllStats',
-                });
-                return cb(null, statsRes);
-            }
-            statsRes.requests = requests;
-            statsRes['500s'] = errors;
-            return cb(null, statsRes);
-        });
-    }
-
-    /**
-    * get stats for the last x seconds, x being the sampling duration
-    * @param log - Werelogs request logger
-    * @param id - service identifier
-    */
-    getStats(log: Logger, id: string, cb: (error: Error | null, value?: any) => void) {
-        if (!this._redis) {
-            return cb(null, {});
-        }
-        const d = new Date();
-        const totalKeys = Math.floor(this._expiry / this._interval);
-        const reqsKeys: ['get', string][] = [];
-        const req500sKeys: ['get', string][] = [];
-        for (let i = 0; i < totalKeys; i++) {
-            reqsKeys.push(['get', this.buildKey(`${id}:requests`, d)]);
-            req500sKeys.push(['get', this.buildKey(`${id}:500s`, d)]);
-            this._setPrevInterval(d);
-        }
-        return async.parallel([
-            next => this._redis.batch(reqsKeys, next),
-            next => this._redis.batch(req500sKeys, next),
-        ], (err, results) => {
-            /**
-            * Batch result is of the format
-            * [ [null, '1'], [null, '2'], [null, '3'] ] where each
-            * item is the result of the each batch command
-            * Foreach item in the result, index 0 signifies the error and
-            * index 1 contains the result
-            */
-            const statsRes = {
-                'requests': 0,
-                '500s': 0,
-                'sampleDuration': this._expiry,
-            };
-            if (err) {
-                log.error('error getting stats', {
-                    error: err,
-                    method: 'StatsClient.getStats',
-                });
-                /**
-                * Redis for stats is not a critial component, ignoring
-                * any error here as returning an InternalError
-                * would be confused with the health of the service
-                */
-                return cb(null, statsRes);
-            }
-            statsRes.requests = this._getCount((results as any)[0]);
-            statsRes['500s'] = this._getCount((results as any)[1]);
-            return cb(null, statsRes);
-        });
-    }
-}
--- a/lib/metrics/StatsModel.js
+++ b/lib/metrics/StatsModel.js
@ -0,0 +1,120 @@
+const StatsClient = require('./StatsClient');
+ /**
+ * @class StatsModel
+ *
+ * @classdesc Extend and overwrite how timestamps are normalized by minutes
+ * rather than by seconds
+ */
+class StatsModel extends StatsClient {
+    /**
+     * normalize date timestamp to the nearest hour
+     * @param {Date} d - Date instance
+     * @return {number} timestamp - normalized to the nearest hour
+     */
+    normalizeTimestampByHour(d) {
+        return d.setMinutes(0, 0, 0);
+    }
+
+    /**
+     * get previous hour to date given
+     * @param {Date} d - Date instance
+     * @return {number} timestamp - one hour prior to date passed
+     */
+    _getDatePreviousHour(d) {
+        return d.setHours(d.getHours() - 1);
+    }
+
+    /**
+     * normalize to the nearest interval
+     * @param {object} d - Date instance
+     * @return {number} timestamp - normalized to the nearest interval
+     */
+    _normalizeTimestamp(d) {
+        const m = d.getMinutes();
+        return d.setMinutes(m - m % (Math.floor(this._interval / 60)), 0, 0);
+    }
+
+    /**
+     * override the method to get the result as an array of integers separated
+     * by each interval
+     * typical input looks like [[null, '1'], [null, '2'], [null, null]...]
+     * @param {array} arr - each index contains the result of each batch command
+     *   where index 0 signifies the error and index 1 contains the result
+     * @return {array} array of integers, ordered from most recent interval to
+     *   oldest interval
+     */
+    _getCount(arr) {
+        return arr.reduce((store, i) => {
+            let num = parseInt(i[1], 10);
+            num = Number.isNaN(num) ? 0 : num;
+            store.push(num);
+            return store;
+        }, []);
+    }
+
+    /**
+     * get list of sorted set key timestamps
+     * @param {number} epoch - epoch time
+     * @return {array} array of sorted set key timestamps
+     */
+    getSortedSetHours(epoch) {
+        const timestamps = [];
+        let date = this.normalizeTimestampByHour(new Date(epoch));
+        while (timestamps.length < 24) {
+            timestamps.push(date);
+            date = this._getDatePreviousHour(new Date(date));
+        }
+        return timestamps;
+    }
+
+    /**
+     * get the normalized hour timestamp for given epoch time
+     * @param {number} epoch - epoch time
+     * @return {string} normalized hour timestamp for given time
+     */
+    getSortedSetCurrentHour(epoch) {
+        return this.normalizeTimestampByHour(new Date(epoch));
+    }
+
+    /**
+     * helper method to add element to a sorted set, applying TTL if new set
+     * @param {string} key - name of key
+     * @param {integer} score - score used to order set
+     * @param {string} value - value to store
+     * @param {callback} cb - callback
+     * @return {undefined}
+     */
+    addToSortedSet(key, score, value, cb) {
+        this._redis.exists(key, (err, resCode) => {
+            if (err) {
+                return cb(err);
+            }
+            if (resCode === 0) {
+                // milliseconds in a day
+                const msInADay = 24 * 60 * 60 * 1000;
+                const nearestHour = this.normalizeTimestampByHour(new Date());
+                // in seconds
+                const ttl = Math.ceil(
+                    (msInADay - (Date.now() - nearestHour)) / 1000);
+                const cmds = [
+                    ['zadd', key, score, value],
+                    ['expire', key, ttl],
+                ];
+                return this._redis.batch(cmds, (err, res) => {
+                    if (err) {
+                        return cb(err);
+                    }
+                    const cmdErr = res.find(r => r[0] !== null);
+                    if (cmdErr) {
+                        return cb(cmdErr);
+                    }
+                    const successResponse = res[0][1];
+                    return cb(null, successResponse);
+                });
+            }
+            return this._redis.zadd(key, score, value, cb);
+        });
+    }
+}
+
+module.exports = StatsModel;
--- a/lib/metrics/StatsModel.ts
+++ b/lib/metrics/StatsModel.ts
@ -1,232 +0,0 @@
-import StatsClient from './StatsClient';
-import { Logger } from 'werelogs';
-import async from 'async';
-
-export type Callback = (error: Error | null, value?: any) => void;
-
-/**
- * @class StatsModel
- *
- * @classdesc Extend and overwrite how timestamps are normalized by minutes
- * rather than by seconds
- */
-export default class StatsModel extends StatsClient {
-    /**
-    * Utility method to convert 2d array rows to columns, and vice versa
-    * See also: https://docs.ruby-lang.org/en/2.0.0/Array.html#method-i-zip
-    * @param arrays - 2d array of integers
-    * @return converted array
-    */
-    _zip(arrays: number[][]) {
-        if (arrays.length > 0 && arrays.every(a => Array.isArray(a))) {
-            return arrays[0].map((_, i) => arrays.map(a => a[i]));
-        }
-        return [];
-    }
-
-    /**
-    * normalize to the nearest interval
-    * @param d - Date instance
-    * @return timestamp - normalized to the nearest interval
-    */
-    _normalizeTimestamp(d: Date) {
-        const m = d.getMinutes();
-        return d.setMinutes(m - m % (Math.floor(this._interval / 60)), 0, 0);
-    }
-
-    /**
-    * override the method to get the count as an array of integers separated
-    * by each interval
-    * typical input looks like [[null, '1'], [null, '2'], [null, null]...]
-    * @param arr - each index contains the result of each batch command
-    *   where index 0 signifies the error and index 1 contains the result
-    * @return array of integers, ordered from most recent interval to
-    *   oldest interval with length of (expiry / interval)
-    */
-    // @ts-expect-errors
-    _getCount(arr: [any, string | null][]): number[] {
-        const size = Math.floor(this._expiry / this._interval);
-        const array = arr.reduce((store, i) => {
-            let num = parseInt(i[1] ?? '', 10);
-            num = Number.isNaN(num) ? 0 : num;
-            store.push(num);
-            return store;
-        }, [] as number[]);
-
-        if (array.length < size) {
-            array.push(...Array(size - array.length).fill(0));
-        }
-        return array;
-    }
-
-    /**
-    * wrapper on `getStats` that handles a list of keys
-    * override the method to reduce the returned 2d array from `_getCount`
-    * @param log - Werelogs request logger
-    * @param ids - service identifiers
-    * @param cb - callback to call with the err/result
-    */
-    getAllStats(log: Logger, ids: string[], cb: Callback) {
-        if (!this._redis) {
-            return cb(null, {});
-        }
-
-        const size = Math.floor(this._expiry / this._interval);
-        const statsRes = {
-            'requests': Array(size).fill(0),
-            '500s': Array(size).fill(0),
-            'sampleDuration': this._expiry,
-        };
-        const requests: any[] = [];
-        const errors: any[] = [];
-
-        if (ids.length === 0) {
-            return cb(null, statsRes);
-        }
-
-        // for now set concurrency to default of 10
-        return async.eachLimit(ids, 10, (id, done) => {
-            this.getStats(log, id, (err, res) => {
-                if (err) {
-                    return done(err);
-                }
-                requests.push(res.requests);
-                errors.push(res['500s']);
-                return done();
-            });
-        }, error => {
-            if (error) {
-                log.error('error getting stats', {
-                    error,
-                    method: 'StatsModel.getAllStats',
-                });
-                return cb(null, statsRes);
-            }
-
-            statsRes.requests = this._zip(requests).map(arr =>
-                arr.reduce((acc, i) => acc + i), 0);
-            statsRes['500s'] = this._zip(errors).map(arr =>
-                arr.reduce((acc, i) => acc + i), 0);
-
-            return cb(null, statsRes);
-        });
-    }
-
-    /**
-     * Handles getting a list of global keys.
-     * @param ids - Service identifiers
-     * @param log - Werelogs request logger
-     * @param cb - Callback
-     */
-    getAllGlobalStats(ids: string[], log: Logger, cb: Callback) {
-        const reqsKeys = ids.map(key => (['get', key]));
-        return this._redis.batch(reqsKeys, (err, res) => {
-            const statsRes = { requests: 0 };
-            if (err) {
-                log.error('error getting metrics', {
-                    error: err,
-                    method: 'StatsClient.getAllGlobalStats',
-                });
-                return cb(null, statsRes);
-            }
-            statsRes.requests = res.reduce((sum, curr) => {
-                const [cmdErr, val] = curr;
-                if (cmdErr) {
-                    // Log any individual request errors from the batch request.
-                    log.error('error getting metrics', {
-                        error: cmdErr,
-                        method: 'StatsClient.getAllGlobalStats',
-                    });
-                }
-                return sum + (Number.parseInt(val, 10) || 0);
-            }, 0);
-            return cb(null, statsRes);
-        });
-    }
-
-    /**
-     * normalize date timestamp to the nearest hour
-     * @param d - Date instance
-     * @return timestamp - normalized to the nearest hour
-     */
-    normalizeTimestampByHour(d: Date) {
-        return d.setMinutes(0, 0, 0);
-    }
-
-    /**
-     * get previous hour to date given
-     * @param d - Date instance
-     * @return timestamp - one hour prior to date passed
-     */
-    _getDatePreviousHour(d: Date) {
-        return d.setHours(d.getHours() - 1);
-    }
-
-    /**
-     * get list of sorted set key timestamps
-     * @param epoch - epoch time
-     * @return array of sorted set key timestamps
-     */
-    getSortedSetHours(epoch: number) {
-        const timestamps: number[] = [];
-        let date = this.normalizeTimestampByHour(new Date(epoch));
-        while (timestamps.length < 24) {
-            timestamps.push(date);
-            date = this._getDatePreviousHour(new Date(date));
-        }
-        return timestamps;
-    }
-
-    /**
-     * get the normalized hour timestamp for given epoch time
-     * @param epoch - epoch time
-     * @return normalized hour timestamp for given time
-     */
-    getSortedSetCurrentHour(epoch: number) {
-        return this.normalizeTimestampByHour(new Date(epoch));
-    }
-
-    /**
-     * helper method to add element to a sorted set, applying TTL if new set
-     * @param key - name of key
-     * @param score - score used to order set
-     * @param value - value to store
-     * @param cb - callback
-     */
-    addToSortedSet(
-        key: string,
-        score: number,
-        value: string,
-        cb: (error: Error | null, value?: any) => void,
-    ) {
-        this._redis.exists(key, (err, resCode) => {
-            if (err) {
-                return cb(err);
-            }
-            if (resCode === 0) {
-                // milliseconds in a day
-                const msInADay = 24 * 60 * 60 * 1000;
-                const nearestHour = this.normalizeTimestampByHour(new Date());
-                // in seconds
-                const ttl = Math.ceil(
-                    (msInADay - (Date.now() - nearestHour)) / 1000);
-                const cmds = [
-                    ['zadd', key, score.toString(), value],
-                    ['expire', key, ttl.toString()],
-                ];
-                return this._redis.batch(cmds, (err, res) => {
-                    if (err) {
-                        return cb(err);
-                    }
-                    const cmdErr = res.find((r: any) => r[0] !== null);
-                    if (cmdErr) {
-                        return cb(cmdErr);
-                    }
-                    const successResponse = res[0][1];
-                    return cb(null, successResponse);
-                });
-            }
-            return this._redis.zadd(key, score, value, cb);
-        });
-    }
-}
--- a/lib/metrics/ZenkoMetrics.js
+++ b/lib/metrics/ZenkoMetrics.js
@ -0,0 +1,40 @@
+const promClient = require('prom-client');
+
+const collectDefaultMetricsIntervalMs =
+      process.env.COLLECT_DEFAULT_METRICS_INTERVAL_MS !== undefined ?
+      Number.parseInt(process.env.COLLECT_DEFAULT_METRICS_INTERVAL_MS, 10) :
+      10000;
+
+promClient.collectDefaultMetrics({ timeout: collectDefaultMetricsIntervalMs });
+
+class ZenkoMetrics {
+    static createCounter(params) {
+        return new promClient.Counter(params);
+    }
+
+    static createGauge(params) {
+        return new promClient.Gauge(params);
+    }
+
+    static createHistogram(params) {
+        return new promClient.Histogram(params);
+    }
+
+    static createSummary(params) {
+        return new promClient.Summary(params);
+    }
+
+    static getMetric(name) {
+        return promClient.register.getSingleMetric(name);
+    }
+
+    static asPrometheus() {
+        return promClient.register.metrics();
+    }
+
+    static asPrometheusContentType() {
+        return promClient.register.contentType;
+    }
+}
+
+module.exports = ZenkoMetrics;
--- a/lib/metrics/ZenkoMetrics.ts
+++ b/lib/metrics/ZenkoMetrics.ts
@ -1,35 +0,0 @@
-import promClient from 'prom-client';
-
-export default class ZenkoMetrics {
-    static createCounter(params: promClient.CounterConfiguration<string>) {
-        return new promClient.Counter(params);
-    }
-
-    static createGauge(params: promClient.GaugeConfiguration<string>) {
-        return new promClient.Gauge(params);
-    }
-
-    static createHistogram(params: promClient.HistogramConfiguration<string>) {
-        return new promClient.Histogram(params);
-    }
-
-    static createSummary(params: promClient.SummaryConfiguration<string>) {
-        return new promClient.Summary(params);
-    }
-
-    static getMetric(name: string) {
-        return promClient.register.getSingleMetric(name);
-    }
-
-    static async asPrometheus() {
-        return promClient.register.metrics();
-    }
-
-    static asPrometheusContentType() {
-        return promClient.register.contentType;
-    }
-
-    static collectDefaultMetrics() {
-        return promClient.collectDefaultMetrics();
-    }
-}
--- a/lib/metrics/index.ts
+++ b/lib/metrics/index.ts
@ -1,4 +0,0 @@
-export { default as StatsClient } from './StatsClient';
-export { default as StatsModel } from './StatsModel';
-export { default as RedisClient } from './RedisClient';
-export { default as ZenkoMetrics } from './ZenkoMetrics';
--- a/lib/models/ARN.js
+++ b/lib/models/ARN.js
@ -1,35 +1,23 @@
-import errors from '../errors'
+const errors = require('../errors').default;

 const validServices = {
    aws: ['s3', 'iam', 'sts', 'ring'],
    scality: ['utapi', 'sso'],
 };

-export default class ARN {
-    _partition: string;
-    _service: string;
-    _region: string | null;
-    _accountId?: string | null;
-    _resource: string;
-
+class ARN {
    /**
     *
     * Create an ARN object from its individual components
     *
     * @constructor
-     * @param partition - ARN partition (e.g. 'aws')
-     * @param service - service name in partition (e.g. 's3')
-     * @param [region] - AWS region
-     * @param [accountId] - AWS 12-digit account ID
-     * @param resource - AWS resource path (e.g. 'foo/bar')
+     * @param {string} partition - ARN partition (e.g. 'aws')
+     * @param {string} service - service name in partition (e.g. 's3')
+     * @param {string} [region] - AWS region
+     * @param {string} [accountId] - AWS 12-digit account ID
+     * @param {string} resource - AWS resource path (e.g. 'foo/bar')
     */
-    constructor(
-        partition: string,
-        service: string,
-        region: string | undefined | null,
-        accountId: string | undefined | null,
-        resource: string,
-    ) {
+    constructor(partition, service, region, accountId, resource) {
        this._partition = partition;
        this._service = service;
        this._region = region || null;
@ -37,7 +25,7 @@ export default class ARN {
        this._resource = resource;
    }

-    static createFromString(arnStr: string) {
+    static createFromString(arnStr) {
        const [arn, partition, service, region, accountId,
               resourceType, resource] = arnStr.split(':');

@ -114,3 +102,5 @@ export default class ARN {
            .join(':');
    }
 }
+
+module.exports = ARN;
--- a/lib/models/BackendInfo.js
+++ b/lib/models/BackendInfo.js
@ -1,36 +1,22 @@
-import { RequestLogger } from 'werelogs';
-
-import { legacyLocations } from '../constants';
-import escapeForXml from '../s3middleware/escapeForXml';
-
-type CloudServerConfig = any;
-
-export default class BackendInfo {
-    _config: CloudServerConfig;
-    _requestEndpoint: string;
-    _objectLocationConstraint?: string;
-    _bucketLocationConstraint?: string;
-    _legacyLocationConstraint?: string;
+const { legacyLocations } = require('../constants');
+const escapeForXml = require('../s3middleware/escapeForXml');

+class BackendInfo {
    /**
    * Represents the info necessary to evaluate which data backend to use
    * on a data put call.
    * @constructor
-    * @param config - CloudServer config containing list of locations
-    * @param objectLocationConstraint - location constraint
+    * @param {object} config - CloudServer config containing list of locations
+    * @param {string | undefined} objectLocationConstraint - location constraint
    * for object based on user meta header
-    * @param bucketLocationConstraint - location
+    * @param {string | undefined } bucketLocationConstraint - location
    * constraint for bucket based on bucket metadata
-    * @param requestEndpoint - endpoint to which request was made
-    * @param legacyLocationConstraint - legacy location constraint
+    * @param {string} requestEndpoint - endpoint to which request was made
+    * @param {string | undefined } legacyLocationConstraint - legacy location
+    * constraint
    */
-    constructor(
-        config: CloudServerConfig,
-        objectLocationConstraint: string | undefined,
-        bucketLocationConstraint: string | undefined,
-        requestEndpoint: string,
-        legacyLocationConstraint: string | undefined,
-    ) {
+    constructor(config, objectLocationConstraint, bucketLocationConstraint,
+        requestEndpoint, legacyLocationConstraint) {
        this._config = config;
        this._objectLocationConstraint = objectLocationConstraint;
        this._bucketLocationConstraint = bucketLocationConstraint;
@ -41,18 +27,15 @@ export default class BackendInfo {

    /**
     * validate proposed location constraint against config
-     * @param config - CloudServer config
-     * @param locationConstraint - value of user
+     * @param {object} config - CloudServer config
+     * @param {string | undefined} locationConstraint - value of user
     * metadata location constraint header or bucket location constraint
-     * @param log - werelogs logger
-     * @return - true if valid, false if not
+     * @param {object} log - werelogs logger
+     * @return {boolean} - true if valid, false if not
     */
-    static isValidLocationConstraint(
-        config: CloudServerConfig,
-        locationConstraint: string | undefined,
-        log: RequestLogger,
-    ) {
-        if (!locationConstraint || !(locationConstraint in config.locationConstraints)) {
+    static isValidLocationConstraint(config, locationConstraint, log) {
+        if (Object.keys(config.locationConstraints).
+            indexOf(locationConstraint) < 0) {
            log.trace('proposed locationConstraint is invalid',
                { locationConstraint });
            return false;
@ -62,17 +45,14 @@ export default class BackendInfo {

    /**
     * validate that request endpoint is listed in the restEndpoint config
-     * @param config - CloudServer config
-     * @param requestEndpoint - request endpoint
-     * @param log - werelogs logger
-     * @return true if present, false if not
+     * @param {object} config - CloudServer config
+     * @param {string} requestEndpoint - request endpoint
+     * @param {object} log - werelogs logger
+     * @return {boolean} - true if present, false if not
     */
-    static isRequestEndpointPresent(
-        config: CloudServerConfig,
-        requestEndpoint: string,
-        log: RequestLogger,
-    ) {
-        if (!(requestEndpoint in config.restEndpoints)) {
+    static isRequestEndpointPresent(config, requestEndpoint, log) {
+        if (Object.keys(config.restEndpoints).
+            indexOf(requestEndpoint) < 0) {
            log.trace('requestEndpoint does not match config restEndpoints',
                { requestEndpoint });
            return false;
@ -83,18 +63,14 @@ export default class BackendInfo {
    /**
     * validate that locationConstraint for request Endpoint matches
     * one config locationConstraint
-     * @param config - CloudServer config
-     * @param requestEndpoint - request endpoint
-     * @param log - werelogs logger
-     * @return - true if matches, false if not
+     * @param {object} config - CloudServer config
+     * @param {string} requestEndpoint - request endpoint
+     * @param {object} log - werelogs logger
+     * @return {boolean} - true if matches, false if not
     */
-    static isRequestEndpointValueValid(
-        config: CloudServerConfig,
-        requestEndpoint: string,
-        log: RequestLogger,
-    ) {
-        const restEndpoint = config.restEndpoints[requestEndpoint];
-        if (!(restEndpoint in config.locationConstraints)) {
+    static isRequestEndpointValueValid(config, requestEndpoint, log) {
+        if (Object.keys(config.locationConstraints).
+            indexOf(config.restEndpoints[requestEndpoint]) < 0) {
            log.trace('the default locationConstraint for request' +
                'Endpoint does not match any config locationConstraint',
            { requestEndpoint });
@ -105,11 +81,11 @@ export default class BackendInfo {

    /**
     * validate that s3 server is running with a file or memory backend
-     * @param config - CloudServer config
-     * @param log - werelogs logger
-     * @return - true if running with file/mem backend, false if not
+     * @param {object} config - CloudServer config
+     * @param {object} log - werelogs logger
+     * @return {boolean} - true if running with file/mem backend, false if not
     */
-    static isMemOrFileBackend(config: CloudServerConfig, log: RequestLogger) {
+    static isMemOrFileBackend(config, log) {
        if (config.backends.data === 'mem' || config.backends.data === 'file') {
            log.trace('use data backend for the location', {
                dataBackend: config.backends.data,
@ -127,16 +103,12 @@ export default class BackendInfo {
     * data backend for the location.
     * - if locationConstraint for request Endpoint does not match
     * any config locationConstraint, we will return an error
-     * @param config - CloudServer config
-     * @param requestEndpoint - request endpoint
-     * @param log - werelogs logger
-     * @return - true if valid, false if not
+     * @param {object} config - CloudServer config
+     * @param {string} requestEndpoint - request endpoint
+     * @param {object} log - werelogs logger
+     * @return {boolean} - true if valid, false if not
     */
-    static isValidRequestEndpointOrBackend(
-        config: CloudServerConfig,
-        requestEndpoint: string,
-        log: RequestLogger,
-    ) {
+    static isValidRequestEndpointOrBackend(config, requestEndpoint, log) {
        if (!BackendInfo.isRequestEndpointPresent(config, requestEndpoint,
            log)) {
            return BackendInfo.isMemOrFileBackend(config, log);
@ -147,22 +119,17 @@ export default class BackendInfo {

    /**
     * validate controlling BackendInfo Parameter
-     * @param config - CloudServer config
-     * @param objectLocationConstraint - value of user
+     * @param {object} config - CloudServer config
+     * @param {string | undefined} objectLocationConstraint - value of user
     * metadata location constraint header
-     * @param bucketLocationConstraint - location
+     * @param {string | null} bucketLocationConstraint - location
     * constraint from bucket metadata
-     * @param requestEndpoint - endpoint of request
-     * @param log - werelogs logger
-     * @return - location constraint validity
+     * @param {string} requestEndpoint - endpoint of request
+     * @param {object} log - werelogs logger
+     * @return {object} - location constraint validity
     */
-    static controllingBackendParam(
-        config: CloudServerConfig,
-        objectLocationConstraint: string | undefined,
-        bucketLocationConstraint: string | null,
-        requestEndpoint: string,
-        log: RequestLogger,
-    ) {
+    static controllingBackendParam(config, objectLocationConstraint,
+        bucketLocationConstraint, requestEndpoint, log) {
        if (objectLocationConstraint) {
            if (BackendInfo.isValidLocationConstraint(config,
                objectLocationConstraint, log)) {
@ -208,16 +175,16 @@ export default class BackendInfo {

    /**
    * Return legacyLocationConstraint
-    * @param config CloudServer config
-    * @return legacyLocationConstraint;
+    * @param {object} config CloudServer config
+    * @return {string | undefined} legacyLocationConstraint;
    */
-    static getLegacyLocationConstraint(config: CloudServerConfig) {
+    static getLegacyLocationConstraint(config) {
        return legacyLocations.find(ll => config.locationConstraints[ll]);
    }

    /**
    * Return objectLocationConstraint
-    * @return objectLocationConstraint;
+    * @return {string | undefined} objectLocationConstraint;
    */
    getObjectLocationConstraint() {
        return this._objectLocationConstraint;
@ -225,7 +192,7 @@ export default class BackendInfo {

    /**
    * Return bucketLocationConstraint
-    * @return bucketLocationConstraint;
+    * @return {string | undefined} bucketLocationConstraint;
    */
    getBucketLocationConstraint() {
        return this._bucketLocationConstraint;
@ -233,7 +200,7 @@ export default class BackendInfo {

    /**
    * Return requestEndpoint
-    * @return requestEndpoint;
+    * @return {string} requestEndpoint;
    */
    getRequestEndpoint() {
        return this._requestEndpoint;
@ -248,9 +215,9 @@ export default class BackendInfo {
    * (4) default locationConstraint for requestEndpoint  if requestEndpoint
    *     is listed in restEndpoints in config.json
    * (5) default data backend
-    * @return locationConstraint;
+    * @return {string} locationConstraint;
    */
-    getControllingLocationConstraint(): string {
+    getControllingLocationConstraint() {
        const objectLC = this.getObjectLocationConstraint();
        const bucketLC = this.getBucketLocationConstraint();
        const reqEndpoint = this.getRequestEndpoint();
@ -269,3 +236,5 @@ export default class BackendInfo {
        return this._config.backends.data;
    }
 }
+
+module.exports = BackendInfo;
--- a/lib/models/BucketAzureInfo.ts
+++ b/lib/models/BucketAzureInfo.ts
@ -1,281 +0,0 @@
-export type DeleteRetentionPolicy = {
-    enabled: boolean;
-    days: number;
-};
-
-/**
- * Helper class to ease access to the Azure specific information for
- * storage accounts mapped to buckets.
- */
-export default class BucketAzureInfo {
-    _data: {
-        sku: string;
-        accessTier: string;
-        kind: string;
-        systemKeys: string[];
-        tenantKeys: string[];
-        subscriptionId: string;
-        resourceGroup: string;
-        deleteRetentionPolicy: DeleteRetentionPolicy;
-        managementPolicies: any[];
-        httpsOnly: boolean;
-        tags: any;
-        networkACL: any[];
-        cname: string;
-        azureFilesAADIntegration: boolean;
-        hnsEnabled: boolean;
-        logging: any;
-        hourMetrics: any;
-        minuteMetrics: any;
-        serviceVersion: string;
-    }
-    /**
-     * @constructor
-     * @param obj - Raw structure for the Azure info on storage account
-     * @param obj.sku - SKU name of this storage account
-     * @param obj.accessTier - Access Tier name of this storage account
-     * @param obj.kind - Kind name of this storage account
-     * @param obj.systemKeys - pair of shared keys for the system
-     * @param obj.tenantKeys - pair of shared keys for the tenant
-     * @param obj.subscriptionId - subscription ID the storage account
-     *   belongs to
-     * @param obj.resourceGroup - Resource group name the storage
-     *   account belongs to
-     * @param obj.deleteRetentionPolicy - Delete retention policy
-     * @param obj.deleteRetentionPolicy.enabled -
-     * @param obj.deleteRetentionPolicy.days -
-     * @param obj.managementPolicies - Management policies for this
-     *   storage account
-     * @param obj.httpsOnly - Server the content of this storage
-     *   account through HTTPS only
-     * @param obj.tags - Set of tags applied on this storage account
-     * @param obj.networkACL - Network ACL of this storage account
-     * @param obj.cname - CNAME of this storage account
-     * @param obj.azureFilesAADIntegration - whether or not Azure
-     *   Files AAD Integration is enabled for this storage account
-     * @param obj.hnsEnabled - whether or not a hierarchical namespace
-     *   is enabled for this storage account
-     * @param obj.logging - service properties: logging
-     * @param obj.hourMetrics - service properties: hourMetrics
-     * @param obj.minuteMetrics - service properties: minuteMetrics
-     * @param obj.serviceVersion - service properties: serviceVersion
-     */
-    constructor(obj: {
-        sku: string;
-        accessTier: string;
-        kind: string;
-        systemKeys: string[];
-        tenantKeys: string[];
-        subscriptionId: string;
-        resourceGroup: string;
-        deleteRetentionPolicy: DeleteRetentionPolicy;
-        managementPolicies: any[];
-        httpsOnly: boolean;
-        tags: any;
-        networkACL: any[];
-        cname: string;
-        azureFilesAADIntegration: boolean;
-        hnsEnabled: boolean;
-        logging: any;
-        hourMetrics: any;
-        minuteMetrics: any;
-        serviceVersion: string;
-    }) {
-        this._data = {
-            sku: obj.sku,
-            accessTier: obj.accessTier,
-            kind: obj.kind,
-            systemKeys: obj.systemKeys,
-            tenantKeys: obj.tenantKeys,
-            subscriptionId: obj.subscriptionId,
-            resourceGroup: obj.resourceGroup,
-            deleteRetentionPolicy: obj.deleteRetentionPolicy,
-            managementPolicies: obj.managementPolicies,
-            httpsOnly: obj.httpsOnly,
-            tags: obj.tags,
-            networkACL: obj.networkACL,
-            cname: obj.cname,
-            azureFilesAADIntegration: obj.azureFilesAADIntegration,
-            hnsEnabled: obj.hnsEnabled,
-            logging: obj.logging,
-            hourMetrics: obj.hourMetrics,
-            minuteMetrics: obj.minuteMetrics,
-            serviceVersion: obj.serviceVersion,
-        };
-    }
-
-    getSku() {
-        return this._data.sku;
-    }
-
-    setSku(sku: string) {
-        this._data.sku = sku;
-        return this;
-    }
-
-    getAccessTier() {
-        return this._data.accessTier;
-    }
-
-    setAccessTier(accessTier: string) {
-        this._data.accessTier = accessTier;
-        return this;
-    }
-
-    getKind() {
-        return this._data.kind;
-    }
-
-    setKind(kind: string) {
-        this._data.kind = kind;
-        return this;
-    }
-
-    getSystemKeys() {
-        return this._data.systemKeys;
-    }
-
-    setSystemKeys(systemKeys: string[]) {
-        this._data.systemKeys = systemKeys;
-        return this;
-    }
-
-    getTenantKeys() {
-        return this._data.tenantKeys;
-    }
-
-    setTenantKeys(tenantKeys: string[]) {
-        this._data.tenantKeys = tenantKeys;
-        return this;
-    }
-
-    getSubscriptionId() {
-        return this._data.subscriptionId;
-    }
-
-    setSubscriptionId(subscriptionId: string) {
-        this._data.subscriptionId = subscriptionId;
-        return this;
-    }
-
-    getResourceGroup() {
-        return this._data.resourceGroup;
-    }
-
-    setResourceGroup(resourceGroup: string) {
-        this._data.resourceGroup = resourceGroup;
-        return this;
-    }
-
-    getDeleteRetentionPolicy() {
-        return this._data.deleteRetentionPolicy;
-    }
-
-    setDeleteRetentionPolicy(deleteRetentionPolicy: DeleteRetentionPolicy) {
-        this._data.deleteRetentionPolicy = deleteRetentionPolicy;
-        return this;
-    }
-
-    getManagementPolicies() {
-        return this._data.managementPolicies;
-    }
-
-    setManagementPolicies(managementPolicies: any[]) {
-        this._data.managementPolicies = managementPolicies;
-        return this;
-    }
-
-    getHttpsOnly() {
-        return this._data.httpsOnly;
-    }
-
-    setHttpsOnly(httpsOnly: boolean) {
-        this._data.httpsOnly = httpsOnly;
-        return this;
-    }
-
-    getTags() {
-        return this._data.tags;
-    }
-
-    setTags(tags: any) {
-        this._data.tags = tags;
-        return this;
-    }
-
-    getNetworkACL() {
-        return this._data.networkACL;
-    }
-
-    setNetworkACL(networkACL: any[]) {
-        this._data.networkACL = networkACL;
-        return this;
-    }
-
-    getCname() {
-        return this._data.cname;
-    }
-
-    setCname(cname: string) {
-        this._data.cname = cname;
-        return this;
-    }
-
-    getAzureFilesAADIntegration() {
-        return this._data.azureFilesAADIntegration;
-    }
-
-    setAzureFilesAADIntegration(azureFilesAADIntegration: boolean) {
-        this._data.azureFilesAADIntegration = azureFilesAADIntegration;
-        return this;
-    }
-
-    getHnsEnabled() {
-        return this._data.hnsEnabled;
-    }
-
-    setHnsEnabled(hnsEnabled: boolean) {
-        this._data.hnsEnabled = hnsEnabled;
-        return this;
-    }
-
-    getLogging() {
-        return this._data.logging;
-    }
-
-    setLogging(logging: any) {
-        this._data.logging = logging;
-        return this;
-    }
-
-    getHourMetrics() {
-        return this._data.hourMetrics;
-    }
-
-    setHourMetrics(hourMetrics: any) {
-        this._data.hourMetrics = hourMetrics;
-        return this;
-    }
-
-    getMinuteMetrics() {
-        return this._data.minuteMetrics;
-    }
-
-    setMinuteMetrics(minuteMetrics: any) {
-        this._data.minuteMetrics = minuteMetrics;
-        return this;
-    }
-
-    getServiceVersion() {
-        return this._data.serviceVersion;
-    }
-
-    setServiceVersion(serviceVersion: any) {
-        this._data.serviceVersion = serviceVersion;
-        return this;
-    }
-
-    getValue() {
-        return this._data;
-    }
-}
--- a/lib/models/BucketInfo.js
+++ b/lib/models/BucketInfo.js
@ -0,0 +1,680 @@
+const assert = require('assert');
+const uuid = require('uuid/v4');
+
+const { WebsiteConfiguration } = require('./WebsiteConfiguration');
+const ReplicationConfiguration = require('./ReplicationConfiguration');
+const LifecycleConfiguration = require('./LifecycleConfiguration');
+const ObjectLockConfiguration = require('./ObjectLockConfiguration');
+const BucketPolicy = require('./BucketPolicy');
+const NotificationConfiguration = require('./NotificationConfiguration');
+
+// WHEN UPDATING THIS NUMBER, UPDATE BucketInfoModelVersion.md CHANGELOG
+// BucketInfoModelVersion.md can be found in the root of this repository
+const modelVersion = 10;
+
+class BucketInfo {
+    /**
+    * Represents all bucket information.
+    * @constructor
+    * @param {string} name - bucket name
+    * @param {string} owner - bucket owner's name
+    * @param {string} ownerDisplayName - owner's display name
+    * @param {object} creationDate - creation date of bucket
+    * @param {number} mdBucketModelVersion - bucket model version
+    * @param {object} [acl] - bucket ACLs (no need to copy
+    * ACL object since referenced object will not be used outside of
+    * BucketInfo instance)
+    * @param {boolean} transient - flag indicating whether bucket is transient
+    * @param {boolean} deleted - flag indicating whether attempt to delete
+    * @param {object} serverSideEncryption - sse information for this bucket
+    * @param {number} serverSideEncryption.cryptoScheme -
+    * cryptoScheme used
+    * @param {string} serverSideEncryption.algorithm -
+    * algorithm to use
+    * @param {string} serverSideEncryption.masterKeyId -
+    * key to get master key
+    * @param {string} serverSideEncryption.configuredMasterKeyId -
+    * custom KMS key id specified by user
+    * @param {boolean} serverSideEncryption.mandatory -
+    * true for mandatory encryption
+    * bucket has been made
+    * @param {object} versioningConfiguration - versioning configuration
+    * @param {string} versioningConfiguration.Status - versioning status
+    * @param {object} versioningConfiguration.MfaDelete - versioning mfa delete
+    * @param {string} locationConstraint - locationConstraint for bucket
+    * @param {WebsiteConfiguration} [websiteConfiguration] - website
+    * configuration
+    * @param {object[]} [cors] - collection of CORS rules to apply
+    * @param {string} [cors[].id] - optional ID to identify rule
+    * @param {string[]} cors[].allowedMethods - methods allowed for CORS request
+    * @param {string[]} cors[].allowedOrigins - origins allowed for CORS request
+    * @param {string[]} [cors[].allowedHeaders] - headers allowed in an OPTIONS
+    * request via the Access-Control-Request-Headers header
+    * @param {number} [cors[].maxAgeSeconds] - seconds browsers should cache
+    * OPTIONS response
+    * @param {string[]} [cors[].exposeHeaders] - headers expose to applications
+    * @param {object} [replicationConfiguration] - replication configuration
+    * @param {object} [lifecycleConfiguration] - lifecycle configuration
+    * @param {object} [bucketPolicy] - bucket policy
+    * @param {string} [uid] - unique identifier for the bucket, necessary
+    * @param {boolean} [objectLockEnabled] - true when object lock enabled
+    * @param {object} [objectLockConfiguration] - object lock configuration
+    * @param {object} [notificationConfiguration] - bucket notification configuration
+    * @param {object[]} [tags] - bucket tags
+    */
+    constructor(name, owner, ownerDisplayName, creationDate,
+                mdBucketModelVersion, acl, transient, deleted,
+                serverSideEncryption, versioningConfiguration,
+                locationConstraint, websiteConfiguration, cors,
+                replicationConfiguration, lifecycleConfiguration,
+                bucketPolicy, uid, objectLockEnabled, objectLockConfiguration,
+                notificationConfiguration, tags) {
+        assert.strictEqual(typeof name, 'string');
+        assert.strictEqual(typeof owner, 'string');
+        assert.strictEqual(typeof ownerDisplayName, 'string');
+        assert.strictEqual(typeof creationDate, 'string');
+        if (mdBucketModelVersion) {
+            assert.strictEqual(typeof mdBucketModelVersion, 'number');
+        }
+        if (acl) {
+            assert.strictEqual(typeof acl, 'object');
+            assert(Array.isArray(acl.FULL_CONTROL));
+            assert(Array.isArray(acl.WRITE));
+            assert(Array.isArray(acl.WRITE_ACP));
+            assert(Array.isArray(acl.READ));
+            assert(Array.isArray(acl.READ_ACP));
+        }
+        if (serverSideEncryption) {
+            assert.strictEqual(typeof serverSideEncryption, 'object');
+            const { cryptoScheme, algorithm, masterKeyId,
+                    configuredMasterKeyId, mandatory } = serverSideEncryption;
+            assert.strictEqual(typeof cryptoScheme, 'number');
+            assert.strictEqual(typeof algorithm, 'string');
+            assert.strictEqual(typeof masterKeyId, 'string');
+            assert.strictEqual(typeof mandatory, 'boolean');
+            if (configuredMasterKeyId !== undefined) {
+                assert.strictEqual(typeof configuredMasterKeyId, 'string');
+            }
+        }
+        if (versioningConfiguration) {
+            assert.strictEqual(typeof versioningConfiguration, 'object');
+            const { Status, MfaDelete } = versioningConfiguration;
+            assert(Status === undefined ||
+                Status === 'Enabled' ||
+                Status === 'Suspended');
+            assert(MfaDelete === undefined ||
+                MfaDelete === 'Enabled' ||
+                MfaDelete === 'Disabled');
+        }
+        if (locationConstraint) {
+            assert.strictEqual(typeof locationConstraint, 'string');
+        }
+        if (websiteConfiguration) {
+            assert(websiteConfiguration instanceof WebsiteConfiguration);
+            const { indexDocument, errorDocument, redirectAllRequestsTo,
+                routingRules } = websiteConfiguration;
+            assert(indexDocument === undefined ||
+                typeof indexDocument === 'string');
+            assert(errorDocument === undefined ||
+                typeof errorDocument === 'string');
+            assert(redirectAllRequestsTo === undefined ||
+                typeof redirectAllRequestsTo === 'object');
+            assert(routingRules === undefined ||
+                Array.isArray(routingRules));
+        }
+        if (cors) {
+            assert(Array.isArray(cors));
+        }
+        if (replicationConfiguration) {
+            ReplicationConfiguration.validateConfig(replicationConfiguration);
+        }
+        if (lifecycleConfiguration) {
+            LifecycleConfiguration.validateConfig(lifecycleConfiguration);
+        }
+        if (bucketPolicy) {
+            BucketPolicy.validatePolicy(bucketPolicy);
+        }
+        if (uid) {
+            assert.strictEqual(typeof uid, 'string');
+            assert.strictEqual(uid.length, 36);
+        }
+        if (objectLockConfiguration) {
+            ObjectLockConfiguration.validateConfig(objectLockConfiguration);
+        }
+        if (notificationConfiguration) {
+            NotificationConfiguration.validateConfig(notificationConfiguration);
+        }
+        const aclInstance = acl || {
+            Canned: 'private',
+            FULL_CONTROL: [],
+            WRITE: [],
+            WRITE_ACP: [],
+            READ: [],
+            READ_ACP: [],
+        };
+        if (tags) {
+            assert(Array.isArray(tags));
+        }
+
+        // IF UPDATING PROPERTIES, INCREMENT MODELVERSION NUMBER ABOVE
+        this._acl = aclInstance;
+        this._name = name;
+        this._owner = owner;
+        this._ownerDisplayName = ownerDisplayName;
+        this._creationDate = creationDate;
+        this._mdBucketModelVersion = mdBucketModelVersion || 0;
+        this._transient = transient || false;
+        this._deleted = deleted || false;
+        this._serverSideEncryption = serverSideEncryption || null;
+        this._versioningConfiguration = versioningConfiguration || null;
+        this._locationConstraint = locationConstraint || null;
+        this._websiteConfiguration = websiteConfiguration || null;
+        this._replicationConfiguration = replicationConfiguration || null;
+        this._cors = cors || null;
+        this._lifecycleConfiguration = lifecycleConfiguration || null;
+        this._bucketPolicy = bucketPolicy || null;
+        this._uid = uid || uuid();
+        this._objectLockEnabled = objectLockEnabled || false;
+        this._objectLockConfiguration = objectLockConfiguration || null;
+        this._notificationConfiguration = notificationConfiguration || null;
+        this._tags = tags || null;
+        return this;
+    }
+    /**
+    * Serialize the object
+    * @return {string} - stringified object
+    */
+    serialize() {
+        const bucketInfos = {
+            acl: this._acl,
+            name: this._name,
+            owner: this._owner,
+            ownerDisplayName: this._ownerDisplayName,
+            creationDate: this._creationDate,
+            mdBucketModelVersion: this._mdBucketModelVersion,
+            transient: this._transient,
+            deleted: this._deleted,
+            serverSideEncryption: this._serverSideEncryption,
+            versioningConfiguration: this._versioningConfiguration,
+            locationConstraint: this._locationConstraint,
+            websiteConfiguration: undefined,
+            cors: this._cors,
+            replicationConfiguration: this._replicationConfiguration,
+            lifecycleConfiguration: this._lifecycleConfiguration,
+            bucketPolicy: this._bucketPolicy,
+            uid: this._uid,
+            objectLockEnabled: this._objectLockEnabled,
+            objectLockConfiguration: this._objectLockConfiguration,
+            notificationConfiguration: this._notificationConfiguration,
+            tags: this._tags,
+        };
+        if (this._websiteConfiguration) {
+            bucketInfos.websiteConfiguration =
+                this._websiteConfiguration.getConfig();
+        }
+        return JSON.stringify(bucketInfos);
+    }
+    /**
+     * deSerialize the JSON string
+     * @param {string} stringBucket - the stringified bucket
+     * @return {object} - parsed string
+     */
+    static deSerialize(stringBucket) {
+        const obj = JSON.parse(stringBucket);
+        const websiteConfig = obj.websiteConfiguration ?
+            new WebsiteConfiguration(obj.websiteConfiguration) : null;
+        return new BucketInfo(obj.name, obj.owner, obj.ownerDisplayName,
+            obj.creationDate, obj.mdBucketModelVersion, obj.acl,
+            obj.transient, obj.deleted, obj.serverSideEncryption,
+            obj.versioningConfiguration, obj.locationConstraint, websiteConfig,
+            obj.cors, obj.replicationConfiguration, obj.lifecycleConfiguration,
+            obj.bucketPolicy, obj.uid, obj.objectLockEnabled,
+            obj.objectLockConfiguration, obj.notificationConfiguration, obj.tags);
+    }
+
+    /**
+     * Returns the current model version for the data structure
+     * @return {number} - the current model version set above in the file
+     */
+    static currentModelVersion() {
+        return modelVersion;
+    }
+
+    /**
+     * Create a BucketInfo from an object
+     *
+     * @param {object} data - object containing data
+     * @return {BucketInfo} Return an BucketInfo
+     */
+    static fromObj(data) {
+        return new BucketInfo(data._name, data._owner, data._ownerDisplayName,
+            data._creationDate, data._mdBucketModelVersion, data._acl,
+            data._transient, data._deleted, data._serverSideEncryption,
+            data._versioningConfiguration, data._locationConstraint,
+            data._websiteConfiguration, data._cors,
+            data._replicationConfiguration, data._lifecycleConfiguration,
+            data._bucketPolicy, data._uid, data._objectLockEnabled,
+            data._objectLockConfiguration, data._notificationConfiguration, data._tags);
+    }
+
+    /**
+    * Get the ACLs.
+    * @return {object} acl
+    */
+    getAcl() {
+        return this._acl;
+    }
+    /**
+    * Set the canned acl's.
+    * @param {string} cannedACL - canned ACL being set
+    * @return {BucketInfo} - bucket info instance
+    */
+    setCannedAcl(cannedACL) {
+        this._acl.Canned = cannedACL;
+        return this;
+    }
+    /**
+    * Set a specific ACL.
+    * @param {string} canonicalID - id for account being given access
+    * @param {string} typeOfGrant - type of grant being granted
+    * @return {BucketInfo} - bucket info instance
+    */
+    setSpecificAcl(canonicalID, typeOfGrant) {
+        this._acl[typeOfGrant].push(canonicalID);
+        return this;
+    }
+    /**
+    * Set all ACLs.
+    * @param {object} acl - new set of ACLs
+    * @return {BucketInfo} - bucket info instance
+    */
+    setFullAcl(acl) {
+        this._acl = acl;
+        return this;
+    }
+    /**
+     * Get the server side encryption information
+     * @return {object} serverSideEncryption
+     */
+    getServerSideEncryption() {
+        return this._serverSideEncryption;
+    }
+    /**
+     * Set server side encryption information
+     * @param {object} serverSideEncryption - server side encryption information
+     * @return {BucketInfo} - bucket info instance
+     */
+    setServerSideEncryption(serverSideEncryption) {
+        this._serverSideEncryption = serverSideEncryption;
+        return this;
+    }
+    /**
+     * Get the versioning configuration information
+     * @return {object} versioningConfiguration
+     */
+    getVersioningConfiguration() {
+        return this._versioningConfiguration;
+    }
+    /**
+     * Set versioning configuration information
+     * @param {object} versioningConfiguration - versioning information
+     * @return {BucketInfo} - bucket info instance
+     */
+    setVersioningConfiguration(versioningConfiguration) {
+        this._versioningConfiguration = versioningConfiguration;
+        return this;
+    }
+    /**
+     * Check that versioning is 'Enabled' on the given bucket.
+     * @return {boolean} - `true` if versioning is 'Enabled', otherwise `false`
+     */
+    isVersioningEnabled() {
+        const versioningConfig = this.getVersioningConfiguration();
+        return versioningConfig ? versioningConfig.Status === 'Enabled' : false;
+    }
+    /**
+     * Get the website configuration information
+     * @return {object} websiteConfiguration
+     */
+    getWebsiteConfiguration() {
+        return this._websiteConfiguration;
+    }
+    /**
+     * Set website configuration information
+     * @param {object} websiteConfiguration - configuration for bucket website
+     * @return {BucketInfo} - bucket info instance
+     */
+    setWebsiteConfiguration(websiteConfiguration) {
+        this._websiteConfiguration = websiteConfiguration;
+        return this;
+    }
+    /**
+     * Set replication configuration information
+     * @param {object} replicationConfiguration - replication information
+     * @return {BucketInfo} - bucket info instance
+     */
+    setReplicationConfiguration(replicationConfiguration) {
+        this._replicationConfiguration = replicationConfiguration;
+        return this;
+    }
+    /**
+     * Get replication configuration information
+     * @return {object|null} replication configuration information or `null` if
+     * the bucket does not have a replication configuration
+     */
+    getReplicationConfiguration() {
+        return this._replicationConfiguration;
+    }
+    /**
+     * Get lifecycle configuration information
+     * @return {object|null} lifecycle configuration information or `null` if
+     * the bucket does not have a lifecycle configuration
+     */
+    getLifecycleConfiguration() {
+        return this._lifecycleConfiguration;
+    }
+    /**
+     * Set lifecycle configuration information
+     * @param {object} lifecycleConfiguration - lifecycle information
+     * @return {BucketInfo} - bucket info instance
+     */
+    setLifecycleConfiguration(lifecycleConfiguration) {
+        this._lifecycleConfiguration = lifecycleConfiguration;
+        return this;
+    }
+    /**
+     * Get bucket policy statement
+     * @return {object|null} bucket policy statement or `null` if the bucket
+     * does not have a bucket policy
+     */
+    getBucketPolicy() {
+        return this._bucketPolicy;
+    }
+    /**
+     * Set bucket policy statement
+     * @param {object} bucketPolicy - bucket policy
+     * @return {BucketInfo} - bucket info instance
+     */
+    setBucketPolicy(bucketPolicy) {
+        this._bucketPolicy = bucketPolicy;
+        return this;
+    }
+    /**
+     * Get object lock configuration
+     * @return {object|null} object lock configuration information or `null` if
+     * the bucket does not have an object lock configuration
+     */
+    getObjectLockConfiguration() {
+        return this._objectLockConfiguration;
+    }
+    /**
+     * Set object lock configuration
+     * @param {object} objectLockConfiguration - object lock information
+     * @return {BucketInfo} - bucket info instance
+     */
+    setObjectLockConfiguration(objectLockConfiguration) {
+        this._objectLockConfiguration = objectLockConfiguration;
+        return this;
+    }
+    /**
+     * Get notification configuration
+     * @return {object|null} notification configuration information or 'null' if
+     * the bucket does not have a notification configuration
+     */
+    getNotificationConfiguration() {
+        return this._notificationConfiguration;
+    }
+    /**
+     * Set notification configuraiton
+     * @param {object} notificationConfiguration - bucket notification information
+     * @return {BucketInfo} - bucket info instance
+     */
+    setNotificationConfiguration(notificationConfiguration) {
+        this._notificationConfiguration = notificationConfiguration;
+        return this;
+    }
+    /**
+     * Get cors resource
+     * @return {object[]} cors
+     */
+    getCors() {
+        return this._cors;
+    }
+    /**
+     * Set cors resource
+     * @param {object[]} rules - collection of CORS rules
+     * @param {string} [rules.id] - optional id to identify rule
+     * @param {string[]} rules[].allowedMethods - methods allowed for CORS
+     * @param {string[]} rules[].allowedOrigins - origins allowed for CORS
+     * @param {string[]} [rules[].allowedHeaders] - headers allowed in an
+     * OPTIONS request via the Access-Control-Request-Headers header
+     * @param {number} [rules[].maxAgeSeconds] - seconds browsers should cache
+     * OPTIONS response
+     * @param {string[]} [rules[].exposeHeaders] - headers to expose to external
+     * applications
+     * @return {BucketInfo} - bucket info instance
+     */
+    setCors(rules) {
+        this._cors = rules;
+        return this;
+    }
+    /**
+     * get the serverside encryption algorithm
+     * @return {string} - sse algorithm used by this bucket
+     */
+    getSseAlgorithm() {
+        if (!this._serverSideEncryption) {
+            return null;
+        }
+        return this._serverSideEncryption.algorithm;
+    }
+    /**
+     * get the server side encryption master key Id
+     * @return {string} -  sse master key Id used by this bucket
+     */
+    getSseMasterKeyId() {
+        if (!this._serverSideEncryption) {
+            return null;
+        }
+        return this._serverSideEncryption.masterKeyId;
+    }
+    /**
+    * Get bucket name.
+    * @return {string} - bucket name
+    */
+    getName() {
+        return this._name;
+    }
+    /**
+    * Set bucket name.
+    * @param {string} bucketName - new bucket name
+    * @return {BucketInfo} - bucket info instance
+    */
+    setName(bucketName) {
+        this._name = bucketName;
+        return this;
+    }
+    /**
+    * Get bucket owner.
+    * @return {string} - bucket owner's canonicalID
+    */
+    getOwner() {
+        return this._owner;
+    }
+    /**
+    * Set bucket owner.
+    * @param {string} ownerCanonicalID - bucket owner canonicalID
+    * @return {BucketInfo} - bucket info instance
+    */
+    setOwner(ownerCanonicalID) {
+        this._owner = ownerCanonicalID;
+        return this;
+    }
+    /**
+    * Get bucket owner display name.
+    * @return {string} - bucket owner dispaly name
+    */
+    getOwnerDisplayName() {
+        return this._ownerDisplayName;
+    }
+    /**
+    * Set bucket owner display name.
+    * @param {string} ownerDisplayName - bucket owner display name
+    * @return {BucketInfo} - bucket info instance
+    */
+    setOwnerDisplayName(ownerDisplayName) {
+        this._ownerDisplayName = ownerDisplayName;
+        return this;
+    }
+    /**
+    * Get bucket creation date.
+    * @return {object} - bucket creation date
+    */
+    getCreationDate() {
+        return this._creationDate;
+    }
+    /**
+    * Set location constraint.
+    * @param {string} location - bucket location constraint
+    * @return {BucketInfo} - bucket info instance
+    */
+    setLocationConstraint(location) {
+        this._locationConstraint = location;
+        return this;
+    }
+
+    /**
+    * Get location constraint.
+    * @return {string} - bucket location constraint
+    */
+    getLocationConstraint() {
+        return this._locationConstraint;
+    }
+
+    /**
+     * Set Bucket model version
+     *
+     * @param {number} version - Model version
+     * @return {BucketInfo} - bucket info instance
+     */
+    setMdBucketModelVersion(version) {
+        this._mdBucketModelVersion = version;
+        return this;
+    }
+    /**
+     * Get Bucket model version
+     *
+     * @return {number} Bucket model version
+     */
+    getMdBucketModelVersion() {
+        return this._mdBucketModelVersion;
+    }
+    /**
+    * Add transient flag.
+    * @return {BucketInfo} - bucket info instance
+    */
+    addTransientFlag() {
+        this._transient = true;
+        return this;
+    }
+    /**
+    * Remove transient flag.
+    * @return {BucketInfo} - bucket info instance
+    */
+    removeTransientFlag() {
+        this._transient = false;
+        return this;
+    }
+    /**
+    * Check transient flag.
+    * @return {boolean} - depending on whether transient flag in place
+    */
+    hasTransientFlag() {
+        return !!this._transient;
+    }
+    /**
+    * Add deleted flag.
+    * @return {BucketInfo} - bucket info instance
+    */
+    addDeletedFlag() {
+        this._deleted = true;
+        return this;
+    }
+    /**
+    * Remove deleted flag.
+    * @return {BucketInfo} - bucket info instance
+    */
+    removeDeletedFlag() {
+        this._deleted = false;
+        return this;
+    }
+    /**
+    * Check deleted flag.
+    * @return {boolean} - depending on whether deleted flag in place
+    */
+    hasDeletedFlag() {
+        return !!this._deleted;
+    }
+    /**
+     * Check if the versioning mode is on.
+     * @return {boolean} - versioning mode status
+     */
+    isVersioningOn() {
+        return this._versioningConfiguration &&
+            this._versioningConfiguration.Status === 'Enabled';
+    }
+    /**
+     * Get unique id of bucket.
+     * @return {string} - unique id
+     */
+    getUid() {
+        return this._uid;
+    }
+    /**
+     * Set unique id of bucket.
+     * @param {string} uid - unique identifier for the bucket
+     * @return {BucketInfo} - bucket info instance
+     */
+    setUid(uid) {
+        this._uid = uid;
+        return this;
+    }
+    /**
+    * Check if object lock is enabled.
+    * @return {boolean} - depending on whether object lock is enabled
+    */
+    isObjectLockEnabled() {
+        return !!this._objectLockEnabled;
+    }
+    /**
+    * Set the value of objectLockEnabled field.
+    * @param {boolean} enabled - true if object lock enabled else false.
+    * @return {BucketInfo} - bucket info instance
+    */
+    setObjectLockEnabled(enabled) {
+        this._objectLockEnabled = enabled;
+        return this;
+    }
+
+    /**
+     * Get the value of bucket tags
+     * @return {object[]} - Array of bucket tags as {"key" : "key", "value": "value"}
+     */
+    getTags() {
+        return this._tags;
+    }
+
+    /**
+     * Set bucket tags
+     * @param {object[]} tags - collection of tags
+     * @param {string[]} tags[].key - key of the tag
+     * @param {string[]} tags[].value - value of the tag
+     * @return {BucketInfo} - bucket info instance
+     */
+    setTags(tags) {
+        this._tags = tags;
+        return this;
+    }
+}
+
+module.exports = BucketInfo;
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
Ronnie Smith	d6bc2afd44	feature: ARSN-150 add missing constants	2022-04-25 14:11:09 -07:00
Ronnie Smith	7f29e03e4a	add missing is	2022-04-22 10:56:35 -07:00
Ronnie Smith	3c6742b607	add missing is	2022-04-21 15:28:21 -07:00
Ronnie Smith	1f1fd401c1	[skip] add is to rpc errors, bucket file interface setup	2022-04-21 12:43:44 -07:00
Ronnie Smith	dab7f54dc5	Merge branch 'development/7.10' into feature/ARSN-150/export-http-utils-for-cloudserver	2022-04-21 11:54:18 -07:00
Ronnie Smith	d6fcbdb4f6	feature: ARSN-150 export http utils for cloudserver	2022-04-18 09:01:34 -07:00