Move polyfills.js into react-dev-utils

[see facebook#2442]

packages/react-dev-utils/README.md

@@ -312,3 +312,11 @@ module.exports = {
   // ...
 }
 ```
+
+#### polyfills
+
+The polyfills files can be included in order to add polyfills for:
+
+ - `Promise` (including automated rejection tracking)
+ - `fetch`
+ - `Object.assign`

packages/react-dev-utils/package.json

@@ -27,6 +27,7 @@
     "ModuleScopePlugin.js",
     "openBrowser.js",
     "openChrome.applescript",
+    "polyfills.js",
     "printHostingInstructions.js",
     "WatchMissingNodeModulesPlugin.js",
     "WebpackDevServerUtils.js",
@@ -44,11 +45,14 @@
     "gzip-size": "3.0.0",
     "html-entities": "1.2.1",
     "inquirer": "3.0.6",
+    "object-assign": "4.1.1",
     "opn": "5.0.0",
+    "promise": "7.1.1",
     "recursive-readdir": "2.2.1",
     "shell-quote": "1.6.1",
     "sockjs-client": "1.1.4",
     "strip-ansi": "3.0.1",
-    "text-table": "0.2.0"
+    "text-table": "0.2.0",
+    "whatwg-fetch": "2.0.3"
   }
 }

packages/react-scripts/config/polyfills.js → packages/react-dev-utils/polyfills.js

@@ -1,4 +1,3 @@
-// @remove-on-eject-begin
 /**
  * Copyright (c) 2015-present, Facebook, Inc.
  * All rights reserved.
@@ -7,7 +6,7 @@
  * LICENSE file in the root directory of this source tree. An additional grant
  * of patent rights can be found in the PATENTS file in the same directory.
  */
-// @remove-on-eject-end
+
 'use strict';
 
 if (typeof Promise === 'undefined') {

packages/react-scripts/config/webpack.config.dev.js

@@ -55,7 +55,7 @@ module.exports = {
     // require.resolve('webpack/hot/dev-server'),
     require.resolve('react-dev-utils/webpackHotDevClient'),
     // We ship a few polyfills by default:
-    require.resolve('./polyfills'),
+    require.resolve('react-dev-utils/polyfills'),
     // Errors should be considered fatal in development
     require.resolve('react-error-overlay'),
     // Finally, this is your app's code:

packages/react-scripts/config/webpack.config.prod.js

@@ -64,7 +64,7 @@ module.exports = {
   // You can exclude the *.map files from the build during deployment.
   devtool: 'source-map',
   // In production, we only want to load the polyfills and the app code.
-  entry: [require.resolve('./polyfills'), paths.appIndexJs],
+  entry: [require.resolve('react-dev-utils/polyfills'), paths.appIndexJs],
   output: {
     // The build folder.
     path: paths.appBuild,

packages/react-scripts/package.json

@@ -44,19 +44,16 @@
     "fs-extra": "3.0.1",
     "html-webpack-plugin": "2.28.0",
     "jest": "20.0.3",
-    "object-assign": "4.1.1",
     "postcss-flexbugs-fixes": "3.0.0",
     "postcss-loader": "2.0.5",
-    "promise": "7.1.1",
     "react-dev-utils": "^3.0.0",
     "react-error-overlay": "^1.0.7",
     "style-loader": "0.17.0",
     "sw-precache-webpack-plugin": "0.9.1",
     "url-loader": "0.5.8",
     "webpack": "2.6.1",
     "webpack-dev-server": "2.4.5",
-    "webpack-manifest-plugin": "1.1.0",
-    "whatwg-fetch": "2.0.3"
+    "webpack-manifest-plugin": "1.1.0"
   },
   "devDependencies": {
     "react": "^15.5.4",

packages/react-scripts/scripts/utils/createJestConfig.js

@@ -24,7 +24,11 @@ module.exports = (resolve, rootDir, isEjecting) => {
   // in Jest configs. We need help from somebody with Windows to determine this.
   const config = {
     collectCoverageFrom: ['src/**/*.{js,jsx}'],
-    setupFiles: [resolve('config/polyfills.js')],
+    setupFiles: [
+      isEjecting
+        ? '<rootDir>/node_modules/react-dev-utils/polyfills.js'
+        : require.resolve('react-dev-utils/polyfills.js'),
+    ],
     setupTestFrameworkScriptFile: setupTestsFile,
     testMatch: [
       '<rootDir>/src/**/__tests__/**/*.js?(x)',