feat: create new @jest/transform package

CHANGELOG.md

@@ -40,6 +40,7 @@
 - `[jest-resolve]`: Migrate to TypeScript ([#7871](https://github.com/facebook/jest/pull/7871))
 - `[@jest/reporter]`: New package extracted from `jest-cli` ([#7902](https://github.com/facebook/jest/pull/7902))
 - `[jest-snapshot]`: Migrate to TypeScript ([#7899](https://github.com/facebook/jest/pull/7899))
+- `[@jest/transform]`: New package extracted from `jest-runtime` ([#7915](https://github.com/facebook/jest/pull/7915))
 
 ### Performance
 

packages/jest-cli/package.json

@@ -5,6 +5,7 @@
   "main": "build/jest.js",
   "dependencies": {
     "@jest/reporters": "^24.1.0",
+    "@jest/transform": "^24.1.0",
     "ansi-escapes": "^3.0.0",
     "chalk": "^2.0.1",
     "exit": "^0.1.2",

packages/jest-cli/src/runGlobalHook.js

@@ -13,7 +13,7 @@ import type {Test} from 'types/TestRunner';
 import {extname} from 'path';
 import pEachSeries from 'p-each-series';
 import {addHook} from 'pirates';
-import Runtime from 'jest-runtime';
+import {ScriptTransformer} from '@jest/transform';
 
 // copied from https://github.com/babel/babel/blob/56044c7851d583d498f919e9546caddf8f80a72f/packages/babel-helpers/src/helpers.js#L558-L562
 function _interopRequireDefault(obj) {
@@ -52,7 +52,7 @@ export default ({
         : // Fallback to first config
           allTests[0].context.config;
 
-      const transformer = new Runtime.ScriptTransformer(projectConfig);
+      const transformer = new ScriptTransformer(projectConfig);
 
       // Load the transformer to avoid a cycle where we need to load a
       // transformer in order to transform it in the require hooks

packages/jest-reporters/package.json

@@ -4,10 +4,10 @@
   "version": "24.1.0",
   "main": "build/index.js",
   "dependencies": {
+    "@jest/transform": "^24.1.0",
     "chalk": "^2.0.1",
     "exit": "^0.1.2",
     "glob": "^7.1.2",
-    "jest-runtime": "^24.1.0",
     "istanbul-api": "^2.1.1",
     "istanbul-lib-coverage": "^2.0.2",
     "istanbul-lib-instrument": "^3.0.1",

packages/jest-reporters/src/generateEmptyCoverage.js

@@ -11,7 +11,7 @@ import type {GlobalConfig, ProjectConfig, Path} from 'types/Config';
 
 import {readInitialCoverage} from 'istanbul-lib-instrument';
 import {classes} from 'istanbul-lib-coverage';
-import Runtime from 'jest-runtime';
+import {shouldInstrument, ScriptTransformer} from '@jest/transform';
 
 export type CoverageWorkerResult = {|
   coverage: any,
@@ -33,9 +33,9 @@ export default function(
     collectCoverageFrom: globalConfig.collectCoverageFrom,
     collectCoverageOnlyFrom: globalConfig.collectCoverageOnlyFrom,
   };
-  if (Runtime.shouldInstrument(filename, coverageOptions, config)) {
+  if (shouldInstrument(filename, coverageOptions, config)) {
     // Transform file with instrumentation to make sure initial coverage data is well mapped to original code.
-    const {code, mapCoverage, sourceMapPath} = new Runtime.ScriptTransformer(
+    const {code, mapCoverage, sourceMapPath} = new ScriptTransformer(
       config,
     ).transformSource(filename, source, true);
     const extracted = readInitialCoverage(code);

packages/jest-runtime/package.json

@@ -10,6 +10,7 @@
   "main": "build/index.js",
   "dependencies": {
     "@babel/core": "^7.1.0",
+    "@jest/transform": "^24.1.0",
     "babel-plugin-istanbul": "^5.1.0",
     "chalk": "^2.0.1",
     "convert-source-map": "^1.4.0",

packages/jest-runtime/src/__tests__/instrumentation.test.js

@@ -11,7 +11,7 @@
 import vm from 'vm';
 import path from 'path';
 import os from 'os';
-import ScriptTransformer from '../ScriptTransformer';
+import {ScriptTransformer} from '@jest/transform';
 
 jest.mock('vm');
 

packages/jest-runtime/src/helpers.js

@@ -5,41 +5,9 @@
 import type {Path} from 'types/Config';
 
 import path from 'path';
-import chalk from 'chalk';
 import slash from 'slash';
 import glob from 'glob';
 
-const DOT = ' \u2022 ';
-
-export const enhanceUnexpectedTokenMessage = (e: Error) => {
-  e.stack =
-    `${chalk.bold.red('Jest encountered an unexpected token')}
-
-This usually means that you are trying to import a file which Jest cannot parse, e.g. it's not plain JavaScript.
-
-By default, if Jest sees a Babel config, it will use that to transform your files, ignoring "node_modules".
-
-Here's what you can do:
-${DOT}To have some of your "node_modules" files transformed, you can specify a custom ${chalk.bold(
-      '"transformIgnorePatterns"',
-    )} in your config.
-${DOT}If you need a custom transformation specify a ${chalk.bold(
-      '"transform"',
-    )} option in your config.
-${DOT}If you simply want to mock your non-JS modules (e.g. binary assets) you can stub them out with the ${chalk.bold(
-      '"moduleNameMapper"',
-    )} config option.
-
-You'll find more details and examples of these config options in the docs:
-${chalk.cyan('https://jestjs.io/docs/en/configuration.html')}
-
-${chalk.bold.red('Details:')}
-
-` + e.stack;
-
-  return e;
-};
-
 export const findSiblingsWithFileExtension = (
   moduleFileExtensions: Array<string>,
   from: Path,

packages/jest-runtime/src/index.js

@@ -24,10 +24,9 @@ import Resolver from 'jest-resolve';
 import {createDirectory, deepCyclicCopy} from 'jest-util';
 import {escapePathForRegex} from 'jest-regex-util';
 import Snapshot from 'jest-snapshot';
+import {ScriptTransformer, shouldInstrument} from '@jest/transform';
 import fs from 'graceful-fs';
 import stripBOM from 'strip-bom';
-import ScriptTransformer from './ScriptTransformer';
-import shouldInstrument from './shouldInstrument';
 import {run as cliRun} from './cli';
 import {options as cliOptions} from './cli/args';
 import {findSiblingsWithFileExtension} from './helpers';

packages/jest-transform/.npmignore

@@ -0,0 +1,3 @@
+**/__mocks__/**
+**/__tests__/**
+src

packages/jest-transform/package.json

@@ -0,0 +1,38 @@
+{
+  "name": "@jest/transform",
+  "version": "24.1.0",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/facebook/jest.git",
+    "directory": "packages/jest-transform"
+  },
+  "license": "MIT",
+  "main": "build/index.js",
+  "dependencies": {
+    "@babel/core": "^7.1.0",
+    "babel-plugin-istanbul": "^5.1.0",
+    "chalk": "^2.0.1",
+    "convert-source-map": "^1.4.0",
+    "fast-json-stable-stringify": "^2.0.0",
+    "graceful-fs": "^4.1.15",
+    "jest-haste-map": "^24.0.0",
+    "jest-regex-util": "^24.0.0",
+    "jest-util": "^24.0.0",
+    "micromatch": "^3.1.10",
+    "realpath-native": "^1.1.0",
+    "slash": "^2.0.0",
+    "write-file-atomic": "2.4.1"
+  },
+  "devDependencies": {
+    "@types/babel__core": "^7.0.4",
+    "@types/convert-source-map": "^1.5.1",
+    "@types/graceful-fs": "^4.1.2",
+    "@types/micromatch": "^3.1.0",
+    "@types/write-file-atomic": "^2.1.1",
+    "jest-config": "^24.1.0"
+  },
+  "engines": {
+    "node": ">= 6"
+  },
+  "gitHead": "b16789230fd45056a7f2fa199bae06c7a1780deb"
+}

packages/jest-runtime/src/ScriptTransformer.js → packages/jest-transform/src/ScriptTransformer.js

@@ -7,21 +7,21 @@
  * @flow
  */
 
-import type {Glob, Path, ProjectConfig} from 'types/Config';
+import type {Path, ProjectConfig} from 'types/Config';
 import type {
   Transformer,
   TransformedSource,
   TransformResult,
 } from 'types/Transform';
 import type {ErrorWithCode} from 'types/Errors';
+import type {Options} from './types';
 
 import crypto from 'crypto';
 import path from 'path';
 import vm from 'vm';
 import {createDirectory} from 'jest-util';
 import fs from 'graceful-fs';
 import {transformSync as babelTransform} from '@babel/core';
-import babelPluginIstanbul from 'babel-plugin-istanbul';
 import convertSourceMap from 'convert-source-map';
 import HasteMap from 'jest-haste-map';
 import stableStringify from 'fast-json-stable-stringify';
@@ -30,24 +30,16 @@ import {version as VERSION} from '../package.json';
 import shouldInstrument from './shouldInstrument';
 import writeFileAtomic from 'write-file-atomic';
 import {sync as realpath} from 'realpath-native';
-import {enhanceUnexpectedTokenMessage} from './helpers';
-
-export type Options = {|
-  changedFiles: ?Set<Path>,
-  collectCoverage: boolean,
-  collectCoverageFrom: Array<Glob>,
-  collectCoverageOnlyFrom: ?{[key: string]: boolean, __proto__: null},
-  extraGlobals?: Array<string>,
-  isCoreModule?: boolean,
-  isInternalModule?: boolean,
-|};
+import enhanceUnexpectedTokenMessage from './enhanceUnexpectedTokenMessage';
 
 type ProjectCache = {|
   configString: string,
   ignorePatternsRegExp: ?RegExp,
   transformedFiles: Map<string, TransformResult>,
 |};
 
+const babelPluginIstanbul = require.resolve('babel-plugin-istanbul');
+
 // This data structure is used to avoid recalculating some data every time that
 // we need to transform a file. Since ScriptTransformer is instantiated for each
 // file we need to keep this object in the local scope of this module.
@@ -175,7 +167,7 @@ export default class ScriptTransformer {
       auxiliaryCommentBefore: ' istanbul ignore next ',
       babelrc: false,
       caller: {
-        name: 'jest-runtime',
+        name: '@jest/transform',
         supportsStaticESM: false,
       },
       configFile: false,

packages/jest-transform/src/enhanceUnexpectedTokenMessage.js

@@ -0,0 +1,36 @@
+// Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
+
+// @flow
+
+import chalk from 'chalk';
+
+const DOT = ' \u2022 ';
+
+export default function enhanceUnexpectedTokenMessage(e: Error) {
+  e.stack =
+    `${chalk.bold.red('Jest encountered an unexpected token')}
+
+This usually means that you are trying to import a file which Jest cannot parse, e.g. it's not plain JavaScript.
+
+By default, if Jest sees a Babel config, it will use that to transform your files, ignoring "node_modules".
+
+Here's what you can do:
+${DOT}To have some of your "node_modules" files transformed, you can specify a custom ${chalk.bold(
+      '"transformIgnorePatterns"',
+    )} in your config.
+${DOT}If you need a custom transformation specify a ${chalk.bold(
+      '"transform"',
+    )} option in your config.
+${DOT}If you simply want to mock your non-JS modules (e.g. binary assets) you can stub them out with the ${chalk.bold(
+      '"moduleNameMapper"',
+    )} config option.
+
+You'll find more details and examples of these config options in the docs:
+${chalk.cyan('https://jestjs.io/docs/en/configuration.html')}
+
+${chalk.bold.red('Details:')}
+
+` + e.stack;
+
+  return e;
+}

packages/jest-transform/src/index.js

@@ -0,0 +1,11 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+
+export {default as ScriptTransformer} from './ScriptTransformer';
+export {default as shouldInstrument} from './shouldInstrument';

packages/jest-runtime/src/shouldInstrument.js → packages/jest-transform/src/shouldInstrument.js

@@ -8,7 +8,7 @@
  */
 
 import type {Path, ProjectConfig} from 'types/Config';
-import type {Options} from './ScriptTransformer';
+import type {Options} from './types';
 
 import path from 'path';
 import {escapePathForRegex} from 'jest-regex-util';

packages/jest-transform/src/types.js

@@ -0,0 +1,21 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+
+import type {Glob, Path} from 'types/Config';
+
+// TODO: Pick from `GlobalConfig`
+export type Options = {|
+  changedFiles: ?Set<Path>,
+  collectCoverage: boolean,
+  collectCoverageFrom: Array<Glob>,
+  collectCoverageOnlyFrom: ?{[key: string]: boolean, __proto__: null},
+  extraGlobals?: Array<string>,
+  isCoreModule?: boolean,
+  isInternalModule?: boolean,
+|};