Function mapper

packages/jest-jasmine2/src/queueRunner.ts:43–86

({fn, timeout, initError = new Error()}: QueueableFn)

  // eslint-disable-next-line unicorn/error-message
  const mapper = ({fn, timeout, initError = new Error()}: QueueableFn) => {
    let promise = new Promise<void>(resolve => {
      const next = function (...args: [Error]) {
        const err = args[0];
        if (err) {
          options.fail.apply(null, args);
        }
        resolve();
      };

      next.fail = function (...args: [Error]) {
        options.fail.apply(null, args);
        resolve();
      };
      try {
        fn.call(options.userContext, next);
      } catch (error: any) {
        options.onException(error);
        resolve();
      }
    });

    promise = Promise.race<void>([promise, token]);

    if (!timeout) {
      return promise;
    }

    const timeoutMs: number = timeout();

    return pTimeout(
      promise,
      timeoutMs,
      options.clearTimeout,
      options.setTimeout,
      () => {
        initError.message = `Timeout - Async callback was not invoked within the ${formatTime(
          timeoutMs,
        )} timeout specified by jest.setTimeout.`;
        initError.stack = initError.message + initError.stack;
        options.onException(initError);
      },
    );
  };

  const result = options.queueableFns.reduce(
    (promise, fn) => promise.then(() => mapper(fn)),