Set up CircleCI (#4491)

.circleci/config.yml

@@ -0,0 +1,97 @@
+aliases:
+  # Cache management
+  - &restore_yarn_cache
+    restore_cache:
+      keys:
+        - v1-yarn-cache
+
+  - &save_yarn_cache
+    save_cache:
+      paths:
+        - ~/.cache/yarn
+      key: v1-yarn-cache
+
+  - &restore_deps_cache
+    restore_cache:
+      keys:
+        - v1-deps-cache-{{ checksum "yarn.lock" }}
+
+  - &save_deps_cache
+    save_cache:
+      paths:
+        - node_modules
+      key: v1-yarn-deps-{{ checksum "yarn.lock" }}
+
+  # Default
+  - &defaults
+    working_directory: ~/prettier
+    docker:
+      - image: circleci/node:9
+
+version: 2
+jobs:
+  # Install dependencies and cache everything
+  checkout_code:
+    <<: *defaults
+    steps:
+      - checkout
+      - *restore_yarn_cache
+      - *restore_deps_cache
+      - run: yarn install
+      - run: yarn check-deps
+      - *save_deps_cache
+      - *save_yarn_cache
+      - persist_to_workspace:
+          root: .
+          paths:
+            - .
+
+  # Create the production bundle and cache
+  build_prod:
+    <<: *defaults
+    environment:
+      NODE_ENV: production
+    steps:
+      - attach_workspace:
+          at: ~/prettier
+      - run: yarn build
+      - persist_to_workspace:
+          root: .
+          paths:
+            - dist
+
+  # Run tests on the production bundle
+  test_prod_node4:
+    <<: *defaults
+    docker:
+      - image: circleci/node:4
+    steps:
+      - attach_workspace:
+          at: ~/prettier
+      - run: yarn test:dist
+
+  # Run tests on the production bundle
+  test_prod_node9:
+    <<: *defaults
+    steps:
+      - attach_workspace:
+          at: ~/prettier
+      - run: yarn test:dist
+
+workflows:
+  version: 2
+  branches:
+    only:
+      - master
+  prod:
+    jobs:
+      - checkout_code
+      - build_prod:
+          requires:
+            - checkout_code
+      - test_prod_node4:
+          requires:
+            - build_prod
+      - test_prod_node9:
+          requires:
+            - build_prod

.travis.yml

@@ -1,28 +1,38 @@
 ---
 language: node_js
+
 node_js:
-  - 4
-  - stable
+  - node
+  - "4"
+
 cache:
   yarn: true
   directories:
     - node_modules
+
 env:
-  - NODE_ENV=development
-  - NODE_ENV=production
+  global:
+    - NODE_ENV=development
+  matrix:
+    - JOB=test AST_COMPARE=1
+
 matrix:
   fast_finish: true
+  include:
+    - node_js: "node"
+      env: JOB=lint
+
 install:
-  - NODE_ENV=development yarn install
+  - yarn install
+
 before_script:
   - yarn check-deps
-  - if [ "${NODE_ENV}" = "production" ]; then yarn build; fi
+
 script:
-  - yarn lint
-  - yarn lint-docs
-  - if [ "${NODE_ENV}" = "production" ]; then yarn test:dist; fi
-  - if [ "${NODE_ENV}" = "development" ]; then AST_COMPARE=1 yarn test -- --runInBand; fi
-  - if [ "${NODE_ENV}" = "development" ]; then yarn codecov; fi
+  - if [ "${JOB}" = "lint" ]; then yarn lint && yarn lint-docs; fi
+  - if [ "${JOB}" = "test" ]; then yarn test --maxWorkers=4 --ci; fi
+  - if [ "${JOB}" = "test" ]; then yarn codecov; fi
+
 branches:
   only:
     - master