race-all.ts

race-all.ts

declare global {
  interface PromiseConstructor {
    delay(t: number, val: any): Promise<any>;
    raceAll<T, E>(
      promises: Promise<T>[],
      timeoutTime: number,
      timeoutVal: E
    ): Promise<(T | E)[]>;
  }
}

Promise.delay = function (t, val) {
  return new Promise((resolve) => {
    setTimeout(resolve.bind(null, val), t);
  });
};

Promise.raceAll = function <T, E>(
  promises: Promise<T>[],
  timeoutTime: number,
  timeoutVal: E
): Promise<(T | E)[]> {
  return Promise.all(
    promises.map((p) => {
      return Promise.race([p, Promise.delay(timeoutTime, timeoutVal)]);
    })
  );
};

returns all resolved promises in a given timeout time
promises that took more time to resolve than timeout time, is replaced by timeout value
you get partial results in desired amount of time, long-running promises get rejected