Add .cjs and .mjs files support to test runner (facebook#8768)

Author: ai

packages/react-scripts/scripts/utils/createJestConfig.js

@@ -40,16 +40,16 @@ module.exports = (resolve, rootDir, isEjecting) => {
     ],
     testEnvironment: 'jest-environment-jsdom-fourteen',
     transform: {
-      '^.+\\.(js|jsx|ts|tsx)$': isEjecting
+      '^.+\\.(js|jsx|mjs|cjs|ts|tsx)$': isEjecting
         ? '<rootDir>/node_modules/babel-jest'
         : resolve('config/jest/babelTransform.js'),
       '^.+\\.css$': resolve('config/jest/cssTransform.js'),
-      '^(?!.*\\.(js|jsx|ts|tsx|css|json)$)': resolve(
+      '^(?!.*\\.(js|jsx|mjs|cjs|ts|tsx|css|json)$)': resolve(
         'config/jest/fileTransform.js'
       ),
     },
     transformIgnorePatterns: [
-      '[/\\\\]node_modules[/\\\\].+\\.(js|jsx|ts|tsx)$',
+      '[/\\\\]node_modules[/\\\\].+\\.(js|jsx|mjs|cjs|ts|tsx)$',
       '^.+\\.module\\.(css|sass|scss)$',
     ],
     modulePaths: modules.additionalModulePaths || [],