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createJestConfig.js 3.20 KiB
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// @remove-file-on-eject
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/**
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 * Copyright (c) 2015-present, Facebook, Inc.
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 *
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 * This source code is licensed under the MIT license found in the
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 * LICENSE file in the root directory of this source tree.
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 */
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'use strict';
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const fs = require('fs');
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const chalk = require('chalk');
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const paths = require('../../config/paths');
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module.exports = (resolve, rootDir, isEjecting) => {
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  // Use this instead of `paths.testsSetup` to avoid putting
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  // an absolute filename into configuration after ejecting.
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  const setupTestsFile = fs.existsSync(paths.testsSetup)
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    ? '<rootDir>/src/setupTests.js'
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    : undefined;
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  // TODO: I don't know if it's safe or not to just use / as path separator
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  // in Jest configs. We need help from somebody with Windows to determine this.
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  const config = {
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    collectCoverageFrom: ['src/**/*.{js,jsx,mjs}'],
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    setupFiles: [resolve('config/polyfills.js')],
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    setupTestFrameworkScriptFile: setupTestsFile,
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    testMatch: [
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      '<rootDir>/src/**/__tests__/**/*.{js,jsx,mjs}',
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      '<rootDir>/src/**/?(*.)(spec|test).{js,jsx,mjs}',
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    ],
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    testEnvironment: 'node',
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    testURL: 'http://localhost',
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    transform: {
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      '^.+\\.(js|jsx|mjs)$': isEjecting
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        ? '<rootDir>/node_modules/babel-jest'
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        : resolve('config/jest/babelTransform.js'),
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      '^.+\\.css$': resolve('config/jest/cssTransform.js'),
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      '^(?!.*\\.(js|jsx|mjs|css|json)$)': resolve(
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        'config/jest/fileTransform.js'
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      ),
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    },
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    transformIgnorePatterns: ['[/\\\\]node_modules[/\\\\].+\\.(js|jsx|mjs)$'],
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    moduleNameMapper: {
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      '^react-native$': 'react-native-web',
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    },
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    moduleFileExtensions: [
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      'web.js',
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      'mjs',
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      'js',
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      'json',
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      'web.jsx',
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      'jsx',
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      'node',
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    ],
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  };
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  if (rootDir) {
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    config.rootDir = rootDir;
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  }
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  const overrides = Object.assign({}, require(paths.appPackageJson).jest);
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  const supportedKeys = [
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    'collectCoverageFrom',
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    'coverageReporters',
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    'coverageThreshold',
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    'snapshotSerializers',
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    'watchPathIgnorePatterns',
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  ];
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  if (overrides) {
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    supportedKeys.forEach(key => {
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      if (overrides.hasOwnProperty(key)) {
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        config[key] = overrides[key];
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delete overrides[key]; } }); const unsupportedKeys = Object.keys(overrides); if (unsupportedKeys.length) { console.error( chalk.red( 'Out of the box, Create React App only supports overriding ' + 'these Jest options:\n\n' + supportedKeys.map(key => chalk.bold(' \u2022 ' + key)).join('\n') + '.\n\n' + 'These options in your package.json Jest configuration ' + 'are not currently supported by Create React App:\n\n' + unsupportedKeys .map(key => chalk.bold(' \u2022 ' + key)) .join('\n') + '\n\nIf you wish to override other Jest options, you need to ' + 'eject from the default setup. You can do so by running ' + chalk.bold('npm run eject') + ' but remember that this is a one-way operation. ' + 'You may also file an issue with Create React App to discuss ' + 'supporting more options out of the box.\n' ) ); process.exit(1); } } return config; };