Validate user-provided config with jest-validate (#301)

* Validate user-provided config with jest-validate

* Don't use object shorthand

* Update jest-validate to 18.2

* Fix Node4 destructuring from require

* Make use of jest-validate for deprecation message

* Remove chalk reference

package.json

@@ -27,6 +27,7 @@
   },
   "devDependencies": {
     "jest": "18.0.0",
+    "jest-validate": "18.2.0",
     "rollup": "0.41.1",
     "rollup-plugin-commonjs": "7.0.0",
     "rollup-plugin-json": "2.1.0",

src/deprecated.js

@@ -0,0 +1,13 @@
+"use strict";
+
+const deprecated = {
+  useFlowParser: config =>
+`  The ${"\"useFlowParser\""} option is deprecated. Use ${"\"parser\""} instead.
+
+  Prettier now treats your configuration as:
+  {
+    ${"\"parser\""}: ${config.seFlowParser ? "\"flow\"" : "\"babylon\""}
+  }`
+};
+
+module.exports = deprecated;

src/options.js

@@ -1,4 +1,8 @@
 "use strict";
+
+var validate = require("jest-validate").validate;
+var deprecatedConfig = require("./deprecated");
+
 var defaults = {
   // Number of spaces the pretty-printer should use per tab
   tabWidth: 2,
@@ -14,15 +18,19 @@ var defaults = {
   parser: "babylon"
 };
 
+var exampleConfig = Object.assign({}, defaults, {
+  filename: "testFilename",
+  printWidth: 80,
+  originalText: "text"
+});
+
 // Copy options and fill in default values.
 function normalize(options) {
+  validate(options, { exampleConfig, deprecatedConfig });
   const normalized = Object.assign({}, options || {});
 
   // For backward compatibility. Deprecated in 0.0.10
   if ("useFlowParser" in normalized) {
-    console.warn(
-      'The `"useFlowParser": true/false` option is deprecated. Use `parser: "flow"` instead.'
-    );
     normalized.parser = normalized.useFlowParser ? "flow" : "babylon";
     delete normalized.useFlowParser;
   }

yarn.lock

@@ -1441,6 +1441,15 @@ jest-util@^18.1.0:
     jest-mock "^18.0.0"
     mkdirp "^0.5.1"
 
+jest-validate@18.2.0:
+  version "18.2.0"
+  resolved "https://registry.yarnpkg.com/jest-validate/-/jest-validate-18.2.0.tgz#01f93ac78f23901cf9889808e2bbb931ffc58d86"
+  dependencies:
+    chalk "^1.1.1"
+    jest-matcher-utils "^18.1.0"
+    leven "^2.0.0"
+    pretty-format "^18.1.0"
+
 jest@18.0.0:
   version "18.0.0"
   resolved "https://registry.yarnpkg.com/jest/-/jest-18.0.0.tgz#ef12f70befe0fcb30f1c61c0ae58748706267d4b"
@@ -1551,6 +1560,10 @@ lcid@^1.0.0:
   dependencies:
     invert-kv "^1.0.0"
 
+leven@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/leven/-/leven-2.0.0.tgz#74c45744439550da185801912829f61d22071bc1"
+
 levn@~0.3.0:
   version "0.3.0"
   resolved "https://registry.yarnpkg.com/levn/-/levn-0.3.0.tgz#3b09924edf9f083c0490fdd4c0bc4421e04764ee"