jest.config.js

const NO_COVERAGE = process.env.NO_COVERAGE === "1";
const CLEAR_CONSOLE = process.env.CLEAR_CONSOLE === "1";

const notice = () => console.log("Using Jest config from `jest.config.js`");

if (CLEAR_CONSOLE) {
  require("clear")();
  console.log();
  notice();
  console.log("Clearing console due to CLEAR_CONSOLE=1");
} else {
  notice();
}

if (NO_COVERAGE) {
  console.log("Coverage not collected due to NO_COVERAGE=1");
}

console.log(
  "Type checking is disabled during Jest for performance reasons, use `jest typecheck` when necessary."
);

module.exports = {
  rootDir: __dirname,
  roots: ["<rootDir>"],
  cache: true,
  verbose: true,
  cacheDirectory: "<rootDir>/tmp/jest",
  moduleFileExtensions: ["ts", "tsx", "js", "json"],
  // preset configs
  // preset: 'ts-jest/presets/js-with-ts',
  // which files to test and which to ignore
  testMatch: ["**/__tests__/*.test.(ts|tsx)"],
  testPathIgnorePatterns: [
    "/node_modules/",
    "/tmp/",
    "/coverage/",
    "/stories/",
    "/\\.storybook/",
  ],
  // don't watch for file changes in node_modules
  watchPathIgnorePatterns: ["/node_modules/"],
  // jest automock settings
  automock: false,
  unmockedModulePathPatterns: ["/node_modules/"],
  // test environment setup
  // setupFiles: [`${__dirname}/setup/setup.js`],
  // setupFilesAfterEnv: [`${__dirname}/setup/setupAfterEnv.ts`],
  // coverage settings
  collectCoverage: NO_COVERAGE === false,
  collectCoverageFrom: NO_COVERAGE
    ? []
    : ["**/*.{ts,tsx}", "!**/*.d.ts", "!**/node_modules/**"],
  coveragePathIgnorePatterns: [
    "/node_modules/",
    "\\.json$",
    "/__tests__/",
    "/stories/",
    "/\\.storybook/",
  ],

  globals: {
    "ts-jest": {
      tsConfig: `${__dirname}/tsconfig.json`,

      // https://huafu.github.io/ts-jest/user/config/diagnostics
      diagnostics: false,

      // Makes jest test run much faster, BUT, without type checking.
      // Type checking in CI is done with `tsc --noEmit` or `yarn typecheck` command.
      // https://huafu.github.io/ts-jest/user/config/isolatedModules
      isolatedModules: true,
    },
  },

  transformIgnorePatterns: [
    "/node_modules/(?!(lodash-es|antd|[^/]+/es|rc-animate|rc-util)/).*",
  ],
  transform: {
    "\\.(ts|tsx)$": "ts-jest",
    "/node_modules/((lodash-es|[^/]+/es)|rc-animate|rc-util)/.*": "ts-jest",
  },
  testTimeout: 30_000,
};