nobuilder/scripts/lib/createJestConfig.js

nobuilder

// @remove-file-on-eject
/**
 * Copyright (c) 2015-present, Facebook, Inc.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */


const fs = require('fs');
const chalk = require('chalk');
const paths = require('./paths');

module.exports = (resolve, rootDir) => {
    // Use this instead of `paths.testsSetup` to avoid putting
    // an absolute filename into configuration after ejecting.
    const setupTestsFile = fs.existsSync(paths.testSetup) ? '<rootDir>/test/setupTests.js' : undefined;

    // TODO: I don't know if it's safe or not to just use / as path separator
    // in Jest configs. We need help from somebody with Windows to determine this.
    const config = {
        collectCoverageFrom: ['src/**/*.{js,jsx,mjs}'],
        coverageDirectory: 'coverage',
        setupFiles: [resolve('lib/polyfills.js')],
        setupTestFrameworkScriptFile: setupTestsFile,
        testMatch: [
            '<rootDir>/test/**/__tests__/**/*.{js,jsx,mjs}',
            '<rootDir>/test/**/?(*.)(spec|test).{js,jsx,mjs}',
        ],
        testEnvironment: 'node',
        testURL: 'http://localhost',
        transform: {
            '^.+\\.(js|jsx|mjs)$': resolve('lib/jest/babelTransform.js'),
            '^.+\\.css$': resolve('lib/jest/cssTransform.js'),
            '^(?!.*\\.(js|jsx|mjs|css|json)$)': resolve('lib/jest/fileTransform.js'),
        },
        transformIgnorePatterns: ['[/\\\\]node_modules[/\\\\].+\\.(js|jsx|mjs)$'],
        moduleFileExtensions: [
            'mjs',
            'js',
            'json',
            'jsx',
        ],
        globals: {
            'ts-jest': {
                tsConfigFile: paths.appTsTestConfig,
            },
        },
    };
    if (rootDir) {
        config.rootDir = rootDir;
    }
    const overrides = Object.assign({}, require(paths.appPackageJson).jest);
    const supportedKeys = [
        'collectCoverageFrom',
        'coverageReporters',
        'coverageThreshold',
        'snapshotSerializers',
    ];
    if (overrides) {
        supportedKeys.forEach((key) => {
            if (overrides.hasOwnProperty(key)) {
                config[key] = overrides[key];
                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;
};