chore(breaking): remove regenerator-runtime injection

CHANGELOG.md

@@ -116,6 +116,7 @@
 - `[*]` [**BREAKING**] Require Node.js 6+ for all packages ([#7258](https://github.com/facebook/jest/pull/7258))
 - `[*]` [**BREAKING**] Use ESM `import` and `export` all over ([#7548](https://github.com/facebook/jest/pull/7548))
 - `[jest-util]` [**BREAKING**] Remove long-deprecated globals for fake timers ([#7285](https://github.com/facebook/jest/pull/7285))
+- `[*]` [**BREAKING**] Remove regenerator-runtime injection ([#7595](https://github.com/facebook/jest/pull/7595))
 - `[docs]` Fix message property in custom matcher example to return a function instead of a constant. ([#7426](https://github.com/facebook/jest/pull/7426))
 - `[jest-circus]` Standardize file naming in `jest-circus` ([#7301](https://github.com/facebook/jest/pull/7301))
 - `[docs]` Add synchronous test.each setup ([#7150](https://github.com/facebook/jest/pull/7150))

e2e/custom-resolver/__tests__/customResolver.test.js

@@ -10,10 +10,6 @@ test('should use the custom resolver', () => {
   require('foo');
 });
 
-test('should have regenerator injected', () => {
-  expect(global.fakeRegeneratorInjected).toEqual(true);
-});
-
 test('should work with automock', () => {
   jest.mock('foo');
 

e2e/custom-resolver/resolver.js

@@ -4,11 +4,7 @@ const {
   default: defaultResolver,
 } = require('jest-resolve/build/defaultResolver');
 
-const exportedModules = new Map([
-  ['foo', 'foo'],
-  ['bar', 'bar'],
-  ['regenerator-runtime/runtime', 'fakeRegenerator'],
-]);
+const exportedModules = new Map([['foo', 'foo'], ['bar', 'bar']]);
 
 module.exports = (name, options) => {
   const resolution = exportedModules.get(name);

e2e/native-async-mock/babel.config.js

@@ -1,6 +1,5 @@
 // Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
 
 module.exports = {
-  plugins: ['@babel/plugin-transform-async-to-generator'],
-  presets: ['@babel/preset-env'],
+  presets: [['@babel/preset-env', {targets: {node: 8}}]],
 };

e2e/native-async-mock/package.json

@@ -4,7 +4,6 @@
   },
   "dependencies": {
     "@babel/core": "^7.0.0",
-    "@babel/plugin-transform-async-to-generator": "^7.0.0",
     "@babel/preset-env": "^7.0.0"
   }
 }

e2e/native-async-mock/yarn.lock

@@ -295,7 +295,7 @@
   dependencies:
     "@babel/helper-plugin-utils" "^7.0.0"
 
-"@babel/plugin-transform-async-to-generator@^7.0.0", "@babel/plugin-transform-async-to-generator@^7.1.0":
+"@babel/plugin-transform-async-to-generator@^7.1.0":
   version "7.1.0"
   resolved "https://registry.yarnpkg.com/@babel/plugin-transform-async-to-generator/-/plugin-transform-async-to-generator-7.1.0.tgz#109e036496c51dd65857e16acab3bafdf3c57811"
   integrity sha512-rNmcmoQ78IrvNCIt/R9U+cixUHeYAzgusTFgIAv+wQb9HJU4szhpDD6e5GCACmj/JP5KxuCwM96bX3L9v4ZN/g==

examples/async/.babelrc.js

@@ -1,11 +1,4 @@
 module.exports = {
-  plugins: [
-    [
-      '@babel/plugin-transform-runtime',
-      {
-        regenerator: true,
-      },
-    ],
-  ],
-  presets: ['@babel/preset-env'],
+  // See https://babeljs.io/docs/en/babel-preset-env#targets
+  presets: [['@babel/preset-env', {targets: {node: 'current'}}]],
 };

examples/async/package.json

@@ -3,9 +3,8 @@
   "version": "0.0.0",
   "name": "example-async",
   "devDependencies": {
-    "@babel/plugin-transform-runtime": "*",
+    "@babel/core": "*",
     "@babel/preset-env": "*",
-    "@babel/runtime": "*",
     "babel-jest": "*",
     "jest": "*"
   },

examples/automatic-mocks/package.json

@@ -3,7 +3,9 @@
   "version": "0.0.0",
   "name": "example-automatic-mocks",
   "devDependencies": {
+    "@babel/core": "*",
     "@babel/preset-env": "*",
+    "babel-jest": "*",
     "jest": "*"
   },
   "scripts": {

examples/enzyme/package.json

@@ -7,6 +7,7 @@
     "react-dom": "^16.4.0"
   },
   "devDependencies": {
+    "@babel/core": "*",
     "@babel/preset-env": "*",
     "@babel/preset-react": "*",
     "babel-jest": "*",

examples/getting-started/package.json

@@ -3,7 +3,9 @@
   "version": "0.0.0",
   "name": "example-getting-started",
   "devDependencies": {
+    "@babel/core": "*",
     "@babel/preset-env": "*",
+    "babel-jest": "*",
     "jest": "*"
   },
   "scripts": {

examples/jquery/package.json

@@ -3,7 +3,9 @@
   "version": "0.0.0",
   "name": "example-jquery",
   "devDependencies": {
+    "@babel/core": "*",
     "@babel/preset-env": "*",
+    "babel-jest": "*",
     "jest": "*"
   },
   "dependencies": {

examples/manual-mocks/package.json

@@ -3,7 +3,9 @@
   "version": "0.0.0",
   "name": "example-manual-mocks",
   "devDependencies": {
+    "@babel/core": "*",
     "@babel/preset-env": "*",
+    "babel-jest": "*",
     "jest": "*"
   },
   "scripts": {

examples/module-mock/package.json

@@ -3,7 +3,9 @@
   "version": "0.0.0",
   "name": "example-manual-mock",
   "devDependencies": {
+    "@babel/core": "*",
     "@babel/preset-env": "*",
+    "babel-jest": "*",
     "jest": "*"
   },
   "scripts": {

examples/react-native/package.json

@@ -11,6 +11,7 @@
     "react-native": "0.57.3"
   },
   "devDependencies": {
+    "@babel/core": "*",
     "@babel/preset-env": "*",
     "babel-jest": "*",
     "jest": "*",

examples/react-testing-library/package.json

@@ -7,6 +7,7 @@
     "react-dom": "^16.4.0"
   },
   "devDependencies": {
+    "@babel/core": "*",
     "@babel/preset-env": "*",
     "@babel/preset-react": "*",
     "babel-jest": "*",

examples/react/package.json

@@ -7,6 +7,7 @@
     "react-dom": "^16.4.0"
   },
   "devDependencies": {
+    "@babel/core": "*",
     "@babel/preset-env": "*",
     "@babel/preset-react": "*",
     "babel-jest": "*",

examples/snapshot/package.json

@@ -6,12 +6,12 @@
     "react": "^16.4.0"
   },
   "devDependencies": {
+    "@babel/core": "*",
     "@babel/preset-env": "*",
     "@babel/preset-react": "*",
     "babel-jest": "*",
     "jest": "*",
-    "react-test-renderer": "*",
-    "regenerator-runtime": "*"
+    "react-test-renderer": "*"
   },
   "scripts": {
     "test": "jest"

examples/timer/package.json

@@ -3,7 +3,9 @@
   "version": "0.0.0",
   "name": "example-timer",
   "devDependencies": {
+    "@babel/core": "*",
     "@babel/preset-env": "*",
+    "babel-jest": "*",
     "jest": "*"
   },
   "scripts": {

examples/typescript/package.json

@@ -8,9 +8,11 @@
     "typescript": "^3.0.0"
   },
   "devDependencies": {
+    "@babel/core": "*",
     "@babel/preset-typescript": "*",
     "@babel/preset-react": "*",
     "@types/jest": "^23.1.1",
+    "babel-jest": "*",
     "jest": "*"
   },
   "scripts": {

package.json

@@ -52,7 +52,6 @@
     "progress": "^2.0.0",
     "promise": "^8.0.2",
     "readable-stream": "^3.0.3",
-    "regenerator-runtime": "^0.12.1",
     "resolve": "^1.4.0",
     "rimraf": "^2.6.2",
     "rollup": "^0.66.1",

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

@@ -738,14 +738,6 @@ describe('babel-jest', () => {
 
     expect(options.transform[0][0]).toBe(DEFAULT_JS_PATTERN);
     expect(options.transform[0][1]).toEqual(require.resolve('babel-jest'));
-    expect(options.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 options', () => {
@@ -762,38 +754,6 @@ describe('babel-jest', () => {
 
     expect(options.transform[0][0]).toBe(customJSPattern);
     expect(options.transform[0][1]).toEqual(require.resolve('babel-jest'));
-    expect(options.setupFiles).toEqual([
-      path.sep +
-        'node_modules' +
-        path.sep +
-        'regenerator-runtime' +
-        path.sep +
-        'runtime',
-    ]);
-  });
-
-  it('uses regenerator if babel-jest is explicitly specified', () => {
-    const ROOT_DIR = '<rootDir>' + path.sep;
-
-    const {options} = normalize(
-      {
-        rootDir: '/root',
-        transform: {
-          [DEFAULT_JS_PATTERN]:
-            ROOT_DIR + Resolver.findNodeModule('babel-jest'),
-        },
-      },
-      {},
-    );
-
-    expect(options.setupFiles).toEqual([
-      path.sep +
-        'node_modules' +
-        path.sep +
-        'regenerator-runtime' +
-        path.sep +
-        'runtime',
-    ]);
   });
 });
 
@@ -1188,12 +1148,7 @@ describe('preset without setupFiles', () => {
     );
 
     expect(options).toEqual(
-      expect.objectContaining({
-        setupFiles: [
-          '/node_modules/regenerator-runtime/runtime',
-          '/node_modules/a',
-        ],
-      }),
+      expect.objectContaining({setupFiles: ['/node_modules/a']}),
     );
   });
 });

packages/jest-config/src/normalize.js

@@ -170,8 +170,6 @@ const setupBabelJest = (options: InitialOptions) => {
       [DEFAULT_JS_PATTERN]: babelJest,
     };
   }
-
-  return babelJest;
 };
 
 const normalizeCollectCoverageOnlyFrom = (
@@ -446,7 +444,8 @@ export default function normalize(options: InitialOptions, argv: Argv) {
     options.coverageDirectory = path.resolve(options.rootDir, 'coverage');
   }
 
-  const babelJest = setupBabelJest(options);
+  setupBabelJest(options);
+
   const newOptions: $Shape<
     DefaultOptions & ProjectConfig & GlobalConfig,
   > = (Object.assign({}, DEFAULT_CONFIG): any);
@@ -774,17 +773,6 @@ export default function normalize(options: InitialOptions, argv: Argv) {
 
   newOptions.maxWorkers = getMaxWorkers(argv);
 
-  if (babelJest) {
-    const regeneratorRuntimePath = Resolver.findNodeModule(
-      'regenerator-runtime/runtime',
-      {basedir: options.rootDir, resolver: newOptions.resolver},
-    );
-
-    if (regeneratorRuntimePath) {
-      newOptions.setupFiles.unshift(regeneratorRuntimePath);
-    }
-  }
-
   if (newOptions.testRegex.length && options.testMatch) {
     throw createConfigError(
       `  Configuration options ${chalk.bold('testMatch')} and` +