Promise.all

PromiseAll.ts

const PromiseAll = (promises: Array<Promise<void>>) => {
  return new Promise((resolve, reject) => {
    let count = 0;
    const results = new Array(promises.length);

    promises.forEach((p, index) => {
      p.then((result) => {
        results[index] = result;
        count++;
      })
        .catch((e) => {
          reject(e);
        })
        .finally(() => {
          if (count === promises.length) resolve(results);
        });
    });
  });
};