chore: migrate jest-runtime to TypeScript

packages/jest-circus/package.json

@@ -11,6 +11,7 @@
   "types": "build/index.d.ts",
   "dependencies": {
     "@babel/traverse": "^7.1.0",
+    "@jest/environment": "^24.1.0",
     "@jest/types": "^24.1.0",
     "@types/node": "*",
     "chalk": "^2.0.1",

packages/jest-circus/src/legacy-code-todo-rewrite/jestAdapter.ts

@@ -6,7 +6,8 @@
  */
 
 import path from 'path';
-import {Config, TestResult, Environment} from '@jest/types';
+import {Config, TestResult} from '@jest/types';
+import {JestEnvironment} from '@jest/environment';
 // @ts-ignore TODO Remove ignore when jest-runtime is migrated to ts
 import Runtime from 'jest-runtime'; // eslint-disable-line import/no-extraneous-dependencies
 import {SnapshotState} from 'jest-snapshot';
@@ -16,7 +17,7 @@ const FRAMEWORK_INITIALIZER = require.resolve('./jestAdapterInit');
 const jestAdapter = async (
   globalConfig: Config.GlobalConfig,
   config: Config.ProjectConfig,
-  environment: Environment.$JestEnvironment,
+  environment: JestEnvironment,
   runtime: Runtime,
   testPath: string,
 ): Promise<TestResult.TestResult> => {

packages/jest-circus/tsconfig.json

@@ -4,5 +4,14 @@
     "outDir": "build",
     "rootDir": "src"
   },
-  "references": [{"path": "../jest-types"}, {"path": "../jest-snapshot"}, {"path": "../jest-matcher-utils"}, {"path":  "../jest-message-util"}, {"path": "../jest-util"}, {"path": "../pretty-format"}, {"path":  "../jest-diff"}]
+  "references": [
+    {"path": "../jest-environment"},
+    {"path": "../jest-types"},
+    {"path": "../jest-snapshot"},
+    {"path": "../jest-matcher-utils"},
+    {"path": "../jest-message-util"},
+    {"path": "../jest-util"},
+    {"path": "../pretty-format"},
+    {"path": "../jest-diff"}
+  ]
 }

packages/jest-environment/.npmignore

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

packages/jest-environment/package.json

@@ -0,0 +1,22 @@
+{
+  "name": "@jest/environment",
+  "version": "24.1.0",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/facebook/jest.git",
+    "directory": "packages/jest-environment"
+  },
+  "license": "MIT",
+  "main": "build/index.js",
+  "types": "build/index.d.ts",
+  "dependencies": {
+    "@jest/transform": "^24.1.0",
+    "@jest/types": "^24.1.0",
+    "@types/node": "*",
+    "jest-mock": "^24.0.0"
+  },
+  "engines": {
+    "node": ">= 6"
+  },
+  "gitHead": "b16789230fd45056a7f2fa199bae06c7a1780deb"
+}

packages/jest-environment/src/index.ts

@@ -0,0 +1,100 @@
+/**
+ * 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.
+ */
+
+import {Script} from 'vm';
+import {Config} from '@jest/types';
+import moduleMocker from 'jest-mock';
+import {ScriptTransformer} from '@jest/transform';
+
+export type EnvironmentContext = {
+  console?: Console;
+  testPath?: Config.Path;
+};
+
+// TODO: Get rid of this at some point
+type JasmineType = {_DEFAULT_TIMEOUT_INTERVAL?: number; addMatchers: Function};
+
+// TODO: type this better: https://nodejs.org/api/modules.html#modules_the_module_wrapper
+type ModuleWrapper = (...args: Array<unknown>) => unknown;
+
+export interface JestEnvironment {
+  new (
+    config: Config.ProjectConfig,
+    context?: EnvironmentContext,
+  ): JestEnvironment;
+  runScript(
+    script: Script,
+  ): {[ScriptTransformer.EVAL_RESULT_VARIABLE]: ModuleWrapper} | null;
+  // TODO: Maybe add `| Window` in the future?
+  global: NodeJS.Global & {__coverage__: any; jasmine: JasmineType};
+  // TODO: When `jest-util` is ESM, this can just be `fakeTimers: import('jest-util').FakeTimers`
+  fakeTimers: {
+    clearAllTimers(): void;
+    runAllImmediates(): void;
+    runAllTicks(): void;
+    runAllTimers(): void;
+    advanceTimersByTime(msToRun: number): void;
+    runOnlyPendingTimers(): void;
+    runWithRealTimers(callback: any): void;
+    getTimerCount(): number;
+    useFakeTimers(): void;
+    useRealTimers(): void;
+  };
+  testFilePath: Config.Path;
+  moduleMocker: typeof moduleMocker;
+  setup(): Promise<void>;
+  teardown(): Promise<void>;
+}
+
+export type Module = typeof module;
+
+export type LocalModuleRequire = typeof require & {
+  requireActual: (moduleName: string) => unknown;
+  requireMock: (moduleName: string) => unknown;
+};
+
+export type Jest = {
+  addMatchers(matchers: Object): void;
+  autoMockOff(): Jest;
+  autoMockOn(): Jest;
+  clearAllMocks(): Jest;
+  clearAllTimers(): void;
+  deepUnmock(moduleName: string): Jest;
+  disableAutomock(): Jest;
+  doMock(moduleName: string, moduleFactory?: () => unknown): Jest;
+  dontMock(moduleName: string): Jest;
+  enableAutomock(): Jest;
+  fn: typeof moduleMocker.fn;
+  genMockFromModule(moduleName: string): any;
+  isMockFunction(fn: Function): boolean;
+  mock(
+    moduleName: string,
+    moduleFactory?: () => unknown,
+    options?: {virtual?: boolean},
+  ): Jest;
+  requireActual: LocalModuleRequire['requireActual'];
+  requireMock: LocalModuleRequire['requireMock'];
+  resetAllMocks(): Jest;
+  resetModuleRegistry(): Jest;
+  resetModules(): Jest;
+  restoreAllMocks(): Jest;
+  retryTimes(numRetries: number): Jest;
+  runAllImmediates(): void;
+  runAllTicks(): void;
+  runAllTimers(): void;
+  runOnlyPendingTimers(): void;
+  advanceTimersByTime(msToRun: number): void;
+  runTimersToTime(msToRun: number): void;
+  getTimerCount(): number;
+  setMock(moduleName: string, moduleExports: any): Jest;
+  setTimeout(timeout: number): Jest;
+  spyOn: typeof moduleMocker.spyOn;
+  unmock(moduleName: string): Jest;
+  useFakeTimers(): Jest;
+  useRealTimers(): Jest;
+  isolateModules(fn: () => void): Jest;
+};

packages/jest-environment/tsconfig.json

@@ -0,0 +1,12 @@
+{
+  "extends": "../../tsconfig.json",
+  "compilerOptions": {
+    "rootDir": "src",
+    "outDir": "build"
+  },
+  "references": [
+    {"path": "../jest-transform"},
+    {"path": "../jest-types"},
+    {"path": "../jest-util"}
+  ]
+}

packages/jest-resolve/src/index.ts

@@ -21,7 +21,7 @@ type FindNodeModuleConfig = {
   extensions?: Array<string>;
   moduleDirectory?: Array<string>;
   paths?: Array<Config.Path>;
-  resolver?: Config.Path;
+  resolver?: Config.Path | null;
   rootDir?: Config.Path;
 };
 
@@ -403,7 +403,7 @@ const createNoMappedModuleFoundError = (
   updatedName: string,
   mappedModuleName: string,
   regex: RegExp,
-  resolver: Function | string,
+  resolver?: Function | string | null,
 ) => {
   const error = new Error(
     chalk.red(`${chalk.bold('Configuration error')}:

packages/jest-resolve/src/types.ts

@@ -9,14 +9,14 @@ import {Config} from '@jest/types';
 
 export type ResolverConfig = {
   browser?: boolean;
-  defaultPlatform?: string;
+  defaultPlatform?: string | null;
   extensions: Array<string>;
   hasCoreModules: boolean;
   moduleDirectories: Array<string>;
-  moduleNameMapper?: Array<ModuleNameMapperConfig>;
+  moduleNameMapper?: Array<ModuleNameMapperConfig> | null;
   modulePaths: Array<Config.Path>;
   platforms?: Array<string>;
-  resolver: Config.Path;
+  resolver?: Config.Path | null;
   rootDir: Config.Path;
 };
 

packages/jest-runtime/package.json

@@ -8,15 +8,19 @@
   },
   "license": "MIT",
   "main": "build/index.js",
+  "types": "build/index.d.ts",
   "dependencies": {
+    "@jest/environment": "^24.1.0",
     "@jest/transform": "^24.1.0",
+    "@jest/types": "^24.1.0",
     "chalk": "^2.0.1",
     "exit": "^0.1.2",
     "glob": "^7.1.3",
     "graceful-fs": "^4.1.15",
     "jest-config": "^24.1.0",
     "jest-haste-map": "^24.0.0",
     "jest-message-util": "^24.0.0",
+    "jest-mock": "^24.0.0",
     "jest-regex-util": "^24.0.0",
     "jest-resolve": "^24.1.0",
     "jest-snapshot": "^24.1.0",

packages/jest-runtime/src/cli/args.js → packages/jest-runtime/src/cli/args.ts

@@ -3,13 +3,13 @@
  *
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
- *
- * @flow
  */
 
+import {Options} from 'yargs';
+
 export const usage = 'Usage: $0 [--config=<pathToConfigFile>] <file>';
 
-export const options = {
+export const options: {[key: string]: Options} = {
   cache: {
     default: true,
     description:

packages/jest-runtime/src/cli/index.js → packages/jest-runtime/src/cli/index.ts

@@ -3,26 +3,25 @@
  *
  * 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 {Argv} from 'types/Argv';
-import type {EnvironmentClass} from 'types/Environment';
-
-import chalk from 'chalk';
 import os from 'os';
 import path from 'path';
+import chalk from 'chalk';
 import {sync as realpath} from 'realpath-native';
 import yargs from 'yargs';
+import {Argv} from '@jest/types';
+import {JestEnvironment} from '@jest/environment';
 import {Console, setGlobal} from 'jest-util';
+// @ts-ignore: Not migrated to TS
 import {validateCLIOptions} from 'jest-validate';
+// @ts-ignore: Not migrated to TS
 import {readConfig, deprecationEntries} from 'jest-config';
+import {VERSION} from '../version';
+import {Context} from '../types';
 import * as args from './args';
 
-const VERSION = (require('../../package.json').version: string);
-
-export function run(cliArgv?: Argv, cliInfo?: Array<string>) {
+export function run(cliArgv?: Argv.Argv, cliInfo?: Array<string>) {
   const realFs = require('fs');
   const fs = require('graceful-fs');
   fs.gracefulify(realFs);
@@ -74,23 +73,22 @@ export function run(cliArgv?: Argv, cliInfo?: Array<string>) {
   };
 
   // Break circular dependency
-  const Runtime = require('..');
+  const Runtime: any = require('..');
 
-  Runtime.createContext(config, {
+  (Runtime.createContext(config, {
     maxWorkers: Math.max(os.cpus().length - 1, 1),
     watchman: globalConfig.watchman,
-  })
+  }) as Promise<Context>)
     .then(hasteMap => {
-      /* $FlowFixMe */
-      const Environment = (require(config.testEnvironment): EnvironmentClass);
+      const Environment: JestEnvironment = require(config.testEnvironment);
       const environment = new Environment(config);
       setGlobal(
         environment.global,
         'console',
         new Console(process.stdout, process.stderr),
       );
-      environment.global.jestProjectConfig = config;
-      environment.global.jestGlobalConfig = globalConfig;
+      setGlobal(environment.global, 'jestProjectConfig', config);
+      setGlobal(environment.global, 'jestGlobalConfig', globalConfig);
 
       const runtime = new Runtime(config, environment, hasteMap.resolver);
       runtime.requireModule(filePath);

packages/jest-runtime/src/helpers.js → packages/jest-runtime/src/helpers.ts

@@ -1,16 +1,13 @@
 // Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
 
-// @flow
-
-import type {Path} from 'types/Config';
-
 import path from 'path';
 import slash from 'slash';
 import glob from 'glob';
+import {Config} from '@jest/types';
 
 export const findSiblingsWithFileExtension = (
-  moduleFileExtensions: Array<string>,
-  from: Path,
+  moduleFileExtensions: Config.ProjectConfig['moduleFileExtensions'],
+  from: Config.Path,
   moduleName: string,
 ): string => {
   if (!path.isAbsolute(moduleName) && path.extname(moduleName) === '') {