Function runJest

packages/jest-core/src/runJest.ts:159–398

({
  contexts,
  globalConfig,
  outputStream,
  testWatcher,
  jestHooks = new JestHook().getEmitter(),
  startRun,
  changedFilesPromise,
  onComplete,
  failedTestsCache,
  filter,
}: {
  globalConfig: Config.GlobalConfig;
  contexts: Array<TestContext>;
  outputStream: WriteStream;
  testWatcher: TestWatcher;
  jestHooks?: JestHookEmitter;
  startRun: (globalConfig: Config.GlobalConfig) => void;
  changedFilesPromise?: ChangedFilesPromise;
  onComplete: (testResults: AggregatedResult) => void;
  failedTestsCache?: FailedTestsCache;
  filter?: Filter;
})

};

export default async function runJest({
  contexts,
  globalConfig,
  outputStream,
  testWatcher,
  jestHooks = new JestHook().getEmitter(),
  startRun,
  changedFilesPromise,
  onComplete,
  failedTestsCache,
  filter,
}: {
  globalConfig: Config.GlobalConfig;
  contexts: Array<TestContext>;
  outputStream: WriteStream;
  testWatcher: TestWatcher;
  jestHooks?: JestHookEmitter;
  startRun: (globalConfig: Config.GlobalConfig) => void;
  changedFilesPromise?: ChangedFilesPromise;
  onComplete: (testResults: AggregatedResult) => void;
  failedTestsCache?: FailedTestsCache;
  filter?: Filter;
}): Promise<void> {
  // Clear cache for required modules - there might be different resolutions
  // from Jest's config loading to running the tests
  Resolver.clearDefaultResolverCache();

  const Sequencer: typeof TestSequencer = await requireOrImportModule(
    globalConfig.testSequencer,
  );
  const sequencer = new Sequencer({contexts, globalConfig});
  let allTests: Array<Test> = [];

  if (changedFilesPromise && globalConfig.watch) {
    const {repos} = await changedFilesPromise;

    const noSCM = (
      Object.keys(repos) as Array<keyof ChangedFiles['repos']>
    ).every(scm => repos[scm].size === 0);
    if (noSCM) {
      process.stderr.write(
        `\n${chalk.bold(
          '--watch',
        )} is not supported without git/hg, please use --watchAll\n`,
      );
      exit(1);
    }
  }

  const searchSources = contexts.map(context => new SearchSource(context));

  performance.mark('jest/getTestPaths:start');
  const testRunData: TestRunData = await Promise.all(
    contexts.map(async (context, index) => {
      const searchSource = searchSources[index];
      const matches = await getTestPaths(
        globalConfig,
        context.config,