How to use the jest-config.defaults.moduleFileExtensions function in jest-config

const { defaults } = require("jest-config");

module.exports = {
  testEnvironment: "node",
    setupFiles: [
      "/../apollo-server-env/dist/index.js"
    ],
    preset: "ts-jest",
    testMatch: null,
    testRegex: "/__tests__/.*\\.test\\.(js|ts)$",
    testPathIgnorePatterns: [
      "/node_modules/",
      "/dist/"
    ],
    moduleFileExtensions: [...defaults.moduleFileExtensions, "ts", "tsx"],
    moduleNameMapper: {
      '^__mocks__/(.*)$': '/../../__mocks__/$1',
      // This regex should match the packages that we want compiled from source
      // through `ts-jest`, as opposed to loaded from their output files in
      // `dist`.
      // We don't want to match `apollo-server-env` and
      // `apollo-engine-reporting-protobuf`, because these don't depend on
      // compilation but need to be initialized from as parto of `prepare`.
      '^(?!apollo-server-env|apollo-engine-reporting-protobuf)(apollo-(?:federation|gateway|server|datasource|cache-control|tracing|engine)[^/]*|graphql-extensions)(?:/dist)?((?:/.*)|$)': '/../../packages/$1/src$2'
    },
    clearMocks: true,
    globals: {
      "ts-jest": {
        tsConfig: "/src/__tests__/tsconfig.json",
        diagnostics: false
      }

module.exports = {
  coverageDirectory: '/coverage',
  coverageReporters: ['lcov'],
  modulePathIgnorePatterns: ['/scripts/', '/.*/__mocks__'],
  moduleNameMapper: {
    "\\.(css|less|sass|scss)$": "/config/jest/__mocks__/styleMock.js",
    "\\.(jpg|jpeg|png|gif|eot|otf|webp|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga)$": "/config/jest/__mocks__/fileMock.js",
    "\\.svg$": "/config/jest/__mocks__/svgrMock.js"
  },
  rootDir: path.resolve(__dirname, '..', '..'),
  setupFilesAfterEnv: ['/config/jest/setup/index.js'],
  transform: {
    '^.+\\.[jt]sx?$': '/config/jest/babel-transformer.js'
  },
  moduleFileExtensions: [...defaults.moduleFileExtensions, 'ts', 'tsx'],
  transformIgnorePatterns: ['/node_modules', '/.*/dist'],
  // watchPlugins: [
  //   'jest-watch-typeahead/filename',
  //   'jest-watch-typeahead/testname'
  // ]
}

verbose: true,
  globalSetup: './tools/testing/jest-setup.ts',
  globalTeardown: './tools/testing/jest-teardown.ts',
  // coverageReporters: [`json-summary`, `text`, `html`, `cobertura`],
  collectCoverageFrom: [
    '**/*.{js,ts}',
    '!**/node_modules/**',
    '!**/dist/**',
    '!**/index.cdn.ts'
  ],
  roots: pkgs.filter(p => !p.endsWith('-types')).map(p => `${p}/src`),
  transform: {
    '^.+\\.tsx?$': 'ts-jest'
  },
  testRegex: '(/__tests__/.*|(\\.|/)(test|spec))\\.[jt]sx?$',
  moduleFileExtensions: [...defaults.moduleFileExtensions, 'ts', 'tsx']
}

const { defaults } = require("jest-config");

module.exports = {
  preset: "ts-jest",
  roots: ["/lib"],
  testEnvironment: "node",
  transform: {
    "^.+\\.tsx?$": "ts-jest"
  },
  testRegex: "(/__tests__/.*|(\\.|/)(test|spec))\\.ts?$",
  moduleFileExtensions: ["ts", "tsx", ...defaults.moduleFileExtensions]
};

// module.exports = {
//   preset: "ts-jest",
//   testEnvironment: "node",
//   roots: ["/lib"],
//   transform: {
//     "^.+\\.tsx?$": "ts-jest"
//   },
//   // testMatch: ["**/__tests__/**/*.ts?(x)", "**/?(*.)+(spec|test).ts?(x)"],
//   testRegex: "(/__tests__/.*|(\\.|/)(test|spec))\\.tsx?$",
//   moduleFileExtensions: ["ts", "tsx", ...defaults.moduleFileExtensions]
// };

// // (/__tests__/.*|(\.|/)(test|spec))\.tsx?$

const {defaults} = require('jest-config');

module.exports = {
  verbose: true,
  moduleFileExtensions: [...defaults.moduleFileExtensions, 'ts', 'tsx'],
  setupFiles: [
    "/__test__/setup/test-shim.js",
    "/__test__/setup/test-setup.js",
  ],
  preset: "ts-jest/presets/js-with-ts",
  transform: {
    "^.+\\.(ts|tsx)$": "ts-jest"
  },
  moduleNameMapper: {
    "\\.(jpg|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga)$": "/tests/setup/fileMock.js",
    "\\.(css|less)$": "/tests/setup/styleMock.js"
  },
  moduleDirectories: [
    "node_modules",
    "dist"
  ],

const { defaults } = require('jest-config')

module.exports = {
  preset: 'react-native',
  moduleFileExtensions: [...defaults.moduleFileExtensions, 'ts', 'tsx'],
  transform: {
    '^.+\\.(js)$': '/node_modules/babel-jest',
    '\\.(ts|tsx)$': '/node_modules/ts-jest/preprocessor.js',
  },
  testRegex: '(/__tests__/.*|\\.(test|spec))\\.(ts|tsx|js)$',
  testPathIgnorePatterns: ['\\.snap$', '/node_modules/', '/lib/'],
  cacheDirectory: '.jest/cache',
}

const { defaults } = require('jest-config');

module.exports = {
	bail: true,
	moduleFileExtensions: [...defaults.moduleFileExtensions, 'ts', 'tsx'],
	roots: ['.'],
	testRegex: "(/__tests__/.*|(\\.|/)(test|spec))\\.tsx?$",
	transform: {
		'^.+\\.tsx?$': 'ts-jest',
	},
	verbose: true,
	"moduleDirectories": ["node_modules", "src"]
};

verbose: true,
  rootDir: '../../',
  coverageDirectory: '/build/coverage',
  collectCoverageFrom: ['src/**/*.js?(x)'],
  coverageReporters: ['json', 'html', 'text', 'lcov'],
  transform: {
    '^.+\\.jsx?$': 'babel-jest',
    '\\.(jpg|png|gif|eot|otf|webp|svg|ttf|woff|mp4|webm|wav|mp3|m4a|aac|oga|css|less)$':
      '/configs/jest/fileTransform.js'
  },
  globals: {
    'babel-jest': {
      useBabelrc: true
    }
  },
  moduleFileExtensions: [...defaults.moduleFileExtensions],
  projects: [
    {
      rootDir: '.',
      displayName: 'Main',
      runner: '@jest-runner/electron/main',
      testEnvironment: 'node',
      testMatch: ['**/main/__tests__/**/*.(spec|test).js']
    },
    {
      rootDir: '.',
      displayName: 'Renderer',
      runner: '@jest-runner/electron',
      testEnvironment: '@jest-runner/electron/environment',
      testMatch: ['**/renderer/__tests__/**/*.(spec|test).jsx']
    }
  ]

const { defaults } = require('jest-config')

module.exports = {
  transform: {
    ...defaults.transform,
    '^.+\\.tsx?$': 'ts-jest',
  },
  testPathIgnorePatterns: [
    ...defaults.testPathIgnorePatterns,
    '/examples/.*/plugins/',
    '/packages/cli/',
  ],
  testRegex: '(/__tests__/.*|(\\.|/)(test|spec))\\.tsx?$',
  testURL: 'http://localhost/',
  moduleFileExtensions: ['ts', 'tsx', ...defaults.moduleFileExtensions],
}

const path = require('path');
const {defaults} = require('jest-config');

module.exports = {
  moduleFileExtensions: [...defaults.moduleFileExtensions],
  testEnvironment: 'node',
  collectCoverage: true,
  coverageDirectory: path.join(__dirname, 'coverage'),
  coverageReporters: [...defaults.coverageReporters, 'html'],
  coveragePathIgnorePatterns: [...defaults.coveragePathIgnorePatterns, 'samples/'],
  transform: {},
  collectCoverageFrom: [
    '**/*.{js}',
    '!**/node_modules/**',
    '!**/samples/**',
    '!**/coverage/**',
    '!jest.*'
  ]
};