combine resolved promise

debounce-promise.ts

export function debounceUntilResolve(func: any) {
  let isDone = true;

  return async (...args: any[]) => {
    if (!isDone) {
      return;
    }

    isDone = false;

    try {
      await func(...args);
    } finally {
      isDone = true;
    }
  };
}

promise.ts

function combine<T>(promises: Promise<T>[]): Promise<T[]> {
  return new Promise((resolve) => {
    let cnt = 0;

    const result: T[] = [];
    const done = () => {
      cnt += 1;

      if (cnt === promises.length) {
        resolve(result);
      }
    };

    const complete = (data) => {
      result.push(data);
    };

    promises.forEach(promise => promise.then(complete).finally(done));
  });
}