Jest: SyntaxError:意外的令牌‘导出’发生在tslb.es6.js上。

Question

我知道这个错误：

C:\Users\myname\Projects\ConfigEditor\MesConfiguration.WebClient\node_modules\tslib\tslib.es6.js:24
    export function __extends(d, b) {
    ^^^^^^

    SyntaxError: Unexpected token 'export'

我的jest-esm.config.mjs看起来像这样

const jestConfig = {
  preset: 'jest-preset-angular/presets/defaults-esm',
  extensionsToTreatAsEsm: ['.ts'],
  globals: {
    'ts-jest': {
      useESM: true,
      stringifyContentPathRegex: '\\.(html|svg)$',
      tsconfig: '<rootDir>/tsconfig-esm.spec.json',
    },
  },
  testEnvironment: 'jsdom',
  moduleFileExtensions: ['ts', 'html', 'js', 'json', 'mjs'],
  resolver: 'jest-preset-angular/build/resolvers/ng-jest-resolver.js',
  transformIgnorePatterns: ['node_modules/(?!.*\\.mjs$)'],
  transform: {
    '^.+\\.(ts|js|mjs|html|svg)$': 'jest-preset-angular',
  },
  globalSetup: 'jest-preset-angular/global-setup',
  moduleNameMapper: {
    //tslib: 'tslib/tslib.mjs',
    tslib: 'tslib/tslib.es6.js',
    "@shared/(.*)": "<rootDir>/src/app/shared/$1",
    "@editors/(.*)": "<rootDir>/src/app/editors/$1",
    "@dashboard/(.*)": "<rootDir>/src/app/dashboard/$1",
    "@env": "<rootDir>/src/environments/environment",
  },
  setupFilesAfterEnv: ['<rootDir>/src/setup-jest.ts'],
}

export default jestConfig;

package.json有

"type": "module",

我开始测试时

"test-esm": "node --experimental-vm-modules --no-warnings node_modules/jest/bin/jest.js -c=jest-esm.config.mjs --no-cache",

什么不对？

将tslb.es6.js重命名为tslib.mjs之后，错误就消失了，但这不是解决方案。它应该在任何yarn install之后都能工作

Answer 1

错误消失了，因为您已经设置了

transformIgnorePatterns: ['node_modules/(?!.*\\.mjs$)']

您基本上是在使用预设的jest-preset-angular/presets/defaults-esm，所以您在配置中键入的大多数属性都是多余的。

有一件事是，transformIgnorePatterns在某种程度上不能处理数组中的多个项(在某些情况下)，所以最好像在我的例子中那样一次性地将所有东西放在一起。

transformIgnorePatterns: ['node_modules/(?!rxjs|tslib)']

下面是我与jest.config.js执行node --experimental-vm-modules node_modules/jest/bin/jest.js一起使用的与Angular14一起使用的完整的Angular14和node --experimental-vm-modules node_modules/jest/bin/jest.js文件

// jest-config.ts
module.exports = {
  preset: 'jest-preset-angular/presets/defaults-esm',
  testRegex: '.*spec.ts$',
  transformIgnorePatterns: [
    'node_modules/(?!rxjs|tslib)'
  ],
  moduleNameMapper: {
    "^dnd-core$": "dnd-core/dist",
    "^react-dnd$": "react-dnd/dist",
    "^react-dnd-html5-backend$": "react-dnd-html5-backend/dist",
    "^react-dnd-touch-backend$": "react-dnd-touch-backend/dist",
    "^react-dnd-test-backend$": "react-dnd-test-backend/dist",
    "^react-dnd-test-utils$": "react-dnd-test-utils/dist"
  },
  setupFilesAfterEnv: ['<rootDir>/setup-jest.ts'],
};

// setup-jest.ts
import 'jest-preset-angular/setup-jest.mjs';

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