Replace babel-polyfill with only regenerator-runtime (jestjs#2755)

README.md

@@ -62,12 +62,14 @@ This test used `expect` and `toBe` to test that two values were exactly identica
 
 ### Using Babel
 
-To use [Babel](http://babeljs.io/), install the `babel-jest` and `babel-polyfill` packages:
+To use [Babel](http://babeljs.io/), install the `babel-jest` and `regenerator-runtime` packages:
 
 ```
-npm install --save-dev babel-jest babel-polyfill
+npm install --save-dev babel-jest regenerator-runtime
 ```
 
+*Note: Explicitly installing `regenerator-runtime` is not needed if you use `npm` 3 or 4 or Yarn*
+
 Don't forget to add a [`.babelrc`](https://babeljs.io/docs/usage/babelrc/) file in your project's root folder. For example, if you are using ES6 and [React.js](https://facebook.github.io/react/) with the [`babel-preset-es2015`](https://babeljs.io/docs/plugins/preset-es2015/) and [`babel-preset-react`](https://babeljs.io/docs/plugins/preset-react/) presets:
 
 ```js

docs/GettingStarted.md

@@ -55,12 +55,14 @@ This test used `expect` and `toBe` to test that two values were exactly identica
 
 ### Using Babel
 
-To use [Babel](http://babeljs.io/), install the `babel-jest` and `babel-polyfill` packages:
+To use [Babel](http://babeljs.io/), install the `babel-jest` and `regenerator-runtime` packages:
 
 ```
-npm install --save-dev babel-jest babel-polyfill
+npm install --save-dev babel-jest regenerator-runtime
 ```
 
+*Note: Explicitly installing `regenerator-runtime` is not needed if you use `npm` 3 or 4 or Yarn*
+
 Don't forget to add a [`.babelrc`](https://babeljs.io/docs/usage/babelrc/) file in your project's root folder. For example, if you are using ES6 and [React.js](https://facebook.github.io/react/) with the [`babel-preset-es2015`](https://babeljs.io/docs/plugins/preset-es2015/) and [`babel-preset-react`](https://babeljs.io/docs/plugins/preset-react/) presets:
 
 ```js

examples/async/package.json

@@ -2,9 +2,9 @@
   "devDependencies": {
     "babel-jest": "*",
     "babel-plugin-transform-async-to-generator": "^6.5.0",
-    "babel-polyfill": "*",
     "babel-preset-es2015": "*",
-    "jest": "*"
+    "jest": "*",
+    "regenerator-runtime": "*"
   },
   "scripts": {
     "test": "jest"

examples/enzyme/package.json

@@ -5,12 +5,12 @@
   },
   "devDependencies": {
     "babel-jest": "*",
-    "babel-polyfill": "*",
     "babel-preset-es2015": "*",
     "babel-preset-react": "*",
     "enzyme": "~2.4.1",
     "jest": "*",
-    "react-addons-test-utils": "15.3.2"
+    "react-addons-test-utils": "15.3.2",
+    "regenerator-runtime": "*"
   },
   "scripts": {
     "test": "jest"

examples/react/package.json

@@ -5,11 +5,11 @@
   },
   "devDependencies": {
     "babel-jest": "*",
-    "babel-polyfill": "*",
     "babel-preset-es2015": "*",
     "babel-preset-react": "*",
     "jest": "*",
-    "react-addons-test-utils": "~15.3.1"
+    "react-addons-test-utils": "~15.3.1",
+    "regenerator-runtime": "*"
   },
   "scripts": {
     "test": "jest"

examples/snapshot/package.json

@@ -4,11 +4,11 @@
   },
   "devDependencies": {
     "babel-jest": "*",
-    "babel-polyfill": "*",
     "babel-preset-es2015": "*",
     "babel-preset-react": "*",
     "jest": "*",
-    "react-test-renderer": "*"
+    "react-test-renderer": "*",
+    "regenerator-runtime": "*"
   },
   "scripts": {
     "test": "jest"

packages/jest-config/src/__tests__/normalize-test.js

@@ -518,8 +518,15 @@ describe('babel-jest', () => {
     expect(config.transform[0][0]).toBe(DEFAULT_JS_PATTERN);
     expect(config.transform[0][1])
       .toEqual(path.sep + 'node_modules' + path.sep + 'babel-jest');
-    expect(config.setupFiles)
-      .toEqual([path.sep + 'node_modules' + path.sep + 'babel-polyfill']);
+    expect(config.setupFiles).toEqual([
+      path.sep +
+        'node_modules' +
+        path.sep +
+        'regenerator-runtime' +
+        path.sep +
+        'runtime',
+    ]);
+
   });
 
   it('uses babel-jest if babel-jest is explicitly specified in a custom transform config', () => {
@@ -533,8 +540,15 @@ describe('babel-jest', () => {
 
     expect(config.transform[0][0]).toBe(customJSPattern);
     expect(config.transform[0][1]).toEqual('/node_modules/babel-jest');
-    expect(config.setupFiles)
-      .toEqual([path.sep + 'node_modules' + path.sep + 'babel-polyfill']);
+    expect(config.setupFiles).toEqual([
+      path.sep +
+        'node_modules' +
+        path.sep +
+        'regenerator-runtime' +
+        path.sep +
+        'runtime',
+    ]);
+
   });
 
   it(`doesn't use babel-jest if its not available`, () => {
@@ -548,7 +562,7 @@ describe('babel-jest', () => {
     expect(config.setupFiles).toEqual([]);
   });
 
-  it('uses polyfills if babel-jest is explicitly specified', () => {
+  it('uses regenerator if babel-jest is explicitly specified', () => {
     const ROOT_DIR = '<rootDir>' + path.sep;
 
     const {config} = normalize({
@@ -560,8 +574,15 @@ describe('babel-jest', () => {
       },
     });
 
-    expect(config.setupFiles)
-      .toEqual([path.sep + 'node_modules' + path.sep + 'babel-polyfill']);
+    expect(config.setupFiles).toEqual([
+      path.sep +
+        'node_modules' +
+        path.sep +
+        'regenerator-runtime' +
+        path.sep +
+        'runtime',
+    ]);
+
   });
 });
 

packages/jest-config/src/normalize.js

@@ -375,12 +375,13 @@ function normalize(config: InitialConfig, argv: Object = {}) {
   }, newConfig);
 
   if (babelJest) {
-    const polyfillPath = Resolver.findNodeModule('babel-polyfill', {
-      basedir: config.rootDir,
-    });
+    const regeneratorRuntimePath = Resolver.findNodeModule(
+      'regenerator-runtime/runtime',
+      {basedir: config.rootDir},
+    );
 
-    if (polyfillPath) {
-      newConfig.setupFiles.unshift(polyfillPath);
+    if (regeneratorRuntimePath) {
+      newConfig.setupFiles.unshift(regeneratorRuntimePath);
     }
   }