diff --git a/CHANGELOG.md b/CHANGELOG.md index 02728ab400e6..09845f3dadb5 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -2,6 +2,7 @@ ### Features +- `[@jest/globals]` New package so Jest's globals can be explicitly imported ([#9801](https://github.com/facebook/jest/pull/9801)) - `[jest-runtime]` Populate `require.cache` ([#9841](https://github.com/facebook/jest/pull/9841)) ### Fixes diff --git a/docs/GlobalAPI.md b/docs/GlobalAPI.md index d01f975884b8..bbbc7d526b05 100644 --- a/docs/GlobalAPI.md +++ b/docs/GlobalAPI.md @@ -3,7 +3,7 @@ id: api title: Globals --- -In your test files, Jest puts each of these methods and objects into the global environment. You don't have to require or import anything to use them. +In your test files, Jest puts each of these methods and objects into the global environment. You don't have to require or import anything to use them. However, if you prefer explicit imports, you can do `import {describe, expect, it} from '@jest/globals'`. ## Methods diff --git a/docs/JestObjectAPI.md b/docs/JestObjectAPI.md index 638e16f38550..784c5c3370f1 100644 --- a/docs/JestObjectAPI.md +++ b/docs/JestObjectAPI.md @@ -3,7 +3,7 @@ id: jest-object title: The Jest Object --- -The `jest` object is automatically in scope within every test file. The methods in the `jest` object help create mocks and let you control Jest's overall behavior. +The `jest` object is automatically in scope within every test file. The methods in the `jest` object help create mocks and let you control Jest's overall behavior. It can also be imported explicitly by via `import {jest} from '@jest/globals'`. ## Mock Modules diff --git a/e2e/__tests__/__snapshots__/nativeEsm.test.ts.snap b/e2e/__tests__/__snapshots__/nativeEsm.test.ts.snap index be56a4394e76..ca20b5785769 100644 --- a/e2e/__tests__/__snapshots__/nativeEsm.test.ts.snap +++ b/e2e/__tests__/__snapshots__/nativeEsm.test.ts.snap @@ -2,7 +2,7 @@ exports[`on node >=12.16.0 runs test with native ESM 1`] = ` Test Suites: 1 passed, 1 total -Tests: 9 passed, 9 total +Tests: 10 passed, 10 total Snapshots: 0 total Time: <> Ran all test suites. diff --git a/e2e/__tests__/importedGlobals.test.ts b/e2e/__tests__/importedGlobals.test.ts new file mode 100644 index 000000000000..146ed6544715 --- /dev/null +++ b/e2e/__tests__/importedGlobals.test.ts @@ -0,0 +1,13 @@ +/** + * 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 runJest from '../runJest'; + +test('imported globals', () => { + const result = runJest('imported-globals'); + expect(result.exitCode).toBe(0); +}); diff --git a/e2e/imported-globals/__tests__/env.test.js b/e2e/imported-globals/__tests__/env.test.js new file mode 100644 index 000000000000..e81a1db5a6d5 --- /dev/null +++ b/e2e/imported-globals/__tests__/env.test.js @@ -0,0 +1,22 @@ +/** + * 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 { + expect as importedExpect, + jest as importedJest, + test as importedTest, +} from '@jest/globals'; + +importedTest('they match the globals', () => { + importedExpect(importedExpect).toBe(expect); + importedExpect(importedJest).toBe(jest); + importedExpect(importedTest).toBe(test); + + expect(importedExpect).toBe(expect); + expect(importedJest).toBe(jest); + expect(importedTest).toBe(test); +}); diff --git a/e2e/imported-globals/babel.config.js b/e2e/imported-globals/babel.config.js new file mode 100644 index 000000000000..9be036106918 --- /dev/null +++ b/e2e/imported-globals/babel.config.js @@ -0,0 +1,8 @@ +/** + * 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. + */ + +module.exports = require('../../babel.config'); diff --git a/e2e/imported-globals/package.json b/e2e/imported-globals/package.json new file mode 100644 index 000000000000..148788b25446 --- /dev/null +++ b/e2e/imported-globals/package.json @@ -0,0 +1,5 @@ +{ + "jest": { + "testEnvironment": "node" + } +} diff --git a/e2e/native-esm/__tests__/native-esm.test.js b/e2e/native-esm/__tests__/native-esm.test.js index 8f1800e57c12..6cf48b3811ec 100644 --- a/e2e/native-esm/__tests__/native-esm.test.js +++ b/e2e/native-esm/__tests__/native-esm.test.js @@ -9,6 +9,7 @@ import {readFileSync} from 'fs'; import {createRequire} from 'module'; import {dirname, resolve} from 'path'; import {fileURLToPath} from 'url'; +import {jest as jestObject} from '@jest/globals'; import staticImportedStateful from '../stateful.mjs'; import staticImportedStatefulFromCjs from '../fromCjs.mjs'; import {double} from '../index'; @@ -90,3 +91,7 @@ test('handle unlinked dynamic imports', async () => { expect(deepDouble(4)).toBe(8); }); + +test('can import `jest` object', () => { + expect(jestObject).toBeDefined(); +}); diff --git a/packages/jest-globals/.npmignore b/packages/jest-globals/.npmignore new file mode 100644 index 000000000000..3ee5d55b0b89 --- /dev/null +++ b/packages/jest-globals/.npmignore @@ -0,0 +1,5 @@ +**/__mocks__/** +**/__tests__/** +src +tsconfig.json +tsconfig.tsbuildinfo diff --git a/packages/jest-globals/package.json b/packages/jest-globals/package.json new file mode 100644 index 000000000000..c216d3beda23 --- /dev/null +++ b/packages/jest-globals/package.json @@ -0,0 +1,30 @@ +{ + "name": "@jest/globals", + "version": "25.4.0", + "repository": { + "type": "git", + "url": "https://github.com/facebook/jest.git", + "directory": "packages/jest-globals" + }, + "engines": { + "node": ">= 8.3" + }, + "license": "MIT", + "main": "build/index.js", + "types": "build/index.d.ts", + "typesVersions": { + "<3.8": { + "build/*": [ + "build/ts3.4/*" + ] + } + }, + "dependencies": { + "@jest/environment": "^25.4.0", + "@jest/types": "^25.4.0", + "expect": "^25.4.0" + }, + "publishConfig": { + "access": "public" + } +} diff --git a/packages/jest-globals/src/__tests__/index.ts b/packages/jest-globals/src/__tests__/index.ts new file mode 100644 index 000000000000..cb0af7398581 --- /dev/null +++ b/packages/jest-globals/src/__tests__/index.ts @@ -0,0 +1,12 @@ +/** + * 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. + */ + +test('throw when directly imported', () => { + expect(() => require('../')).toThrowError( + 'Do not import `@jest/globals` outside of the Jest test environment', + ); +}); diff --git a/packages/jest-globals/src/index.ts b/packages/jest-globals/src/index.ts new file mode 100644 index 000000000000..82bc15a3b522 --- /dev/null +++ b/packages/jest-globals/src/index.ts @@ -0,0 +1,31 @@ +/** + * 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 importedExpect = require('expect'); +import type {Jest} from '@jest/environment'; +import type {Global} from '@jest/types'; + +export declare type jest = Jest; + +export declare type expect = typeof importedExpect; + +export declare type it = Global.GlobalAdditions['it']; +export declare type test = Global.GlobalAdditions['test']; +export declare type fit = Global.GlobalAdditions['fit']; +export declare type xit = Global.GlobalAdditions['xit']; +export declare type xtest = Global.GlobalAdditions['xtest']; +export declare type describe = Global.GlobalAdditions['describe']; +export declare type xdescribe = Global.GlobalAdditions['xdescribe']; +export declare type fdescribe = Global.GlobalAdditions['fdescribe']; +export declare type beforeAll = Global.GlobalAdditions['beforeAll']; +export declare type beforeEach = Global.GlobalAdditions['beforeEach']; +export declare type afterEach = Global.GlobalAdditions['afterEach']; +export declare type afterAll = Global.GlobalAdditions['afterAll']; + +throw new Error( + 'Do not import `@jest/globals` outside of the Jest test environment', +); diff --git a/packages/jest-globals/tsconfig.json b/packages/jest-globals/tsconfig.json new file mode 100644 index 000000000000..b6678e5f0aed --- /dev/null +++ b/packages/jest-globals/tsconfig.json @@ -0,0 +1,14 @@ +{ + "extends": "../../tsconfig.json", + "compilerOptions": { + // we don't want `@types/jest` to be referenced + "types": ["node"], + "rootDir": "src", + "outDir": "build" + }, + "references": [ + {"path": "../expect"}, + {"path": "../jest-environment"}, + {"path": "../jest-types"} + ] +} diff --git a/packages/jest-runtime/package.json b/packages/jest-runtime/package.json index bcbe8cc534c7..856194f2d8fc 100644 --- a/packages/jest-runtime/package.json +++ b/packages/jest-runtime/package.json @@ -19,6 +19,7 @@ "dependencies": { "@jest/console": "^25.4.0", "@jest/environment": "^25.4.0", + "@jest/globals": "^25.4.0", "@jest/source-map": "^25.2.6", "@jest/test-result": "^25.4.0", "@jest/transform": "^25.4.0", diff --git a/packages/jest-runtime/src/index.ts b/packages/jest-runtime/src/index.ts index 92a46b78b914..39f0cbcb3cc8 100644 --- a/packages/jest-runtime/src/index.ts +++ b/packages/jest-runtime/src/index.ts @@ -19,7 +19,7 @@ import { compileFunction, } from 'vm'; import * as nativeModule from 'module'; -import type {Config} from '@jest/types'; +import type {Config, Global} from '@jest/types'; import type { Jest, JestEnvironment, @@ -27,6 +27,7 @@ import type { Module, ModuleWrapper, } from '@jest/environment'; +import type * as JestGlobals from '@jest/globals'; import type {SourceMapRegistry} from '@jest/source-map'; import {formatStackTrace, separateMessageFromStack} from 'jest-message-util'; import {createDirectory, deepCyclicCopy} from 'jest-util'; @@ -52,6 +53,11 @@ import Resolver = require('jest-resolve'); import Snapshot = require('jest-snapshot'); import stripBOM = require('strip-bom'); +interface JestGlobalsValues extends Global.TestFrameworkGlobals { + jest: JestGlobals.jest; + expect: JestGlobals.expect; +} + type HasteMapOptions = { console?: Console; maxWorkers: number; @@ -148,6 +154,7 @@ class Runtime { private _unmockList: RegExp | undefined; private _virtualMocks: BooleanObject; private _moduleImplementation?: typeof nativeModule.Module; + private jestObjectCaches: Map; constructor( config: Config.ProjectConfig, @@ -185,6 +192,7 @@ class Runtime { this._sourceMapRegistry = Object.create(null); this._fileTransforms = new Map(); this._virtualMocks = Object.create(null); + this.jestObjectCaches = new Map(); this._mockMetaDataCache = Object.create(null); this._shouldMockModuleCache = Object.create(null); @@ -317,13 +325,6 @@ class Runtime { modulePath: Config.Path, query = '', ): Promise { - if (modulePath === '@jest/globals') { - // TODO: create a Synthetic Module for this. Will need to create a `jest` object without a `LocalModuleRequire` - throw new Error( - 'Importing `@jest/globals` is not supported from ESM yet', - ); - } - const cacheKey = modulePath + query; if (!this._esmoduleRegistry.has(cacheKey)) { @@ -371,11 +372,27 @@ class Runtime { return module; } - private async linkModules(specifier: string, referencingModule: VMModule) { + private linkModules(specifier: string, referencingModule: VMModule) { + if (specifier === '@jest/globals') { + const fromCache = this._esmoduleRegistry.get('@jest/globals'); + + if (fromCache) { + return fromCache; + } + const globals = this.getGlobalsForEsm( + referencingModule.identifier, + referencingModule.context, + ); + this._esmoduleRegistry.set('@jest/globals', globals); + + return globals; + } + const resolved = this._resolveModule( referencingModule.identifier, specifier, ); + if ( this._resolver.isCoreModule(resolved) || this.unstable_shouldLoadAsEsm(resolved) @@ -649,12 +666,18 @@ class Runtime { }; } - requireModuleOrMock(from: Config.Path, moduleName: string): unknown { + requireModuleOrMock(from: Config.Path, moduleName: string): T { + // this module is unmockable + if (moduleName === '@jest/globals') { + // @ts-ignore: we don't care that it's not assignable to T + return this.getGlobalsForCjs(from); + } + try { if (this._shouldMock(from, moduleName)) { - return this.requireMock(from, moduleName); + return this.requireMock(from, moduleName); } else { - return this.requireModule(from, moduleName); + return this.requireModule(from, moduleName); } } catch (e) { const moduleNotFound = Resolver.tryCastModuleNotFoundError(e); @@ -981,6 +1004,10 @@ class Runtime { return; } + const jestObject = this._createJestObjectFor(filename); + + this.jestObjectCaches.set(filename, jestObject); + try { compiledFunction.call( localModule.exports, @@ -990,7 +1017,7 @@ class Runtime { dirname, // __dirname filename, // __filename this._environment.global, // global object - this._createJestObjectFor(filename), // jest object + jestObject, // jest object ...this._config.extraGlobals.map(globalVariable => { if (this._environment.global[globalVariable]) { return this._environment.global[globalVariable]; @@ -1520,6 +1547,69 @@ class Runtime { throw e; } + + private getGlobalsForCjs(from: Config.Path): JestGlobalsValues { + const jest = this.jestObjectCaches.get(from); + + invariant(jest, 'There should always be a Jest object already'); + + return {...this.getGlobalsFromEnvironment(), jest}; + } + + private async getGlobalsForEsm( + from: Config.Path, + context: VMContext, + ): Promise { + let jest = this.jestObjectCaches.get(from); + + if (!jest) { + jest = this._createJestObjectFor(from); + + this.jestObjectCaches.set(from, jest); + } + + const globals: JestGlobalsValues = { + ...this.getGlobalsFromEnvironment(), + jest, + }; + + const module = new SyntheticModule( + Object.keys(globals), + function () { + Object.entries(globals).forEach(([key, value]) => { + // @ts-ignore: TS doesn't know what `this` is + this.setExport(key, value); + }); + }, + {context, identifier: '@jest/globals'}, + ); + + await module.link(() => { + throw new Error('This should never happen'); + }); + + await module.evaluate(); + + return module; + } + + private getGlobalsFromEnvironment(): Omit { + return { + afterAll: this._environment.global.afterAll, + afterEach: this._environment.global.afterEach, + beforeAll: this._environment.global.beforeAll, + beforeEach: this._environment.global.beforeEach, + describe: this._environment.global.describe, + expect: this._environment.global.expect, + fdescribe: this._environment.global.fdescribe, + fit: this._environment.global.fit, + it: this._environment.global.it, + test: this._environment.global.test, + xdescribe: this._environment.global.xdescribe, + xit: this._environment.global.xit, + xtest: this._environment.global.xtest, + }; + } } function invariant(condition: unknown, message?: string): asserts condition { diff --git a/packages/jest-runtime/tsconfig.json b/packages/jest-runtime/tsconfig.json index 08abc7a9ddfc..2955d779d6b1 100644 --- a/packages/jest-runtime/tsconfig.json +++ b/packages/jest-runtime/tsconfig.json @@ -9,6 +9,7 @@ {"path": "../jest-console"}, {"path": "../jest-environment"}, {"path": "../jest-environment-node"}, + {"path": "../jest-globals"}, {"path": "../jest-haste-map"}, {"path": "../jest-message-util"}, {"path": "../jest-mock"},