A fix for Promise.all. Explanation here: https://dev.to/domiii/a-solution-to-the-deep-flaws-of-promiseall-4aon-temp-slug-8454028

betterPromiseAll.js

/**
 * Fixes the "muted errors problem" of Promise.all.
 *
 * {@link betterPromiseAll}
 * @see https://gist.github.com/Domiii/41c1dc504025e789fd8741f78d3ac528
 * @see https://dev.to/domiii/a-solution-to-the-deep-flaws-of-promiseall-1ldh
 */
async function betterPromiseAll(promises) {
  const results = await Promise.allSettled(promises);
  const values = [];
  const errors = [];

  for (const result of results) {
    if (result.status === 'rejected') {
      errors.push(result.reason);
    }
    else {
      values.push(result.value);
    }
  }

  if (errors.length) {
    // NOTE: `AggregateError` is also not mature YET. It's internal `errors` property is (currently, as of 2/2022) NOT rendered when reported, so we have to do it manually.
    // throw new AggregateError(errors, 'Promise.allSettled rejections');
    throw new Error(`${errors.length} promise rejections: ${errors.map((err, i) => `\n  [${i + 1}] ${err.stack || err}`).join('')}\n------`);
  }
  return values;
}



// /** ###########################################################################
//  * some samples
//  * ##########################################################################*/
// async function runSample(cb) {
//   try {
//     const result = await cb();
//     console.log('########\nFULFILL:\n', result);
//   }
//   catch (err) {
//     console.error('########\nREJECT:\n', err);
//   }
// }

// // reject
// runSample(() => {
//   return betterPromiseAll([
//     Promise.reject(1), 
//     Promise.reject(new Error(2)), 
//     Promise.resolve().then(() => { throw new Error(3); })
//   ]);
// });

// // reject
// runSample(() => {
//   return betterPromiseAll([
//     Promise.resolve(1),
//     Promise.reject(new Error(2)), 
//     Promise.resolve().then(() => { throw new Error(3); })
//   ]);
// });

// // fulfill
// runSample(() => {
//   return betterPromiseAll([
//     Promise.resolve(1),
//     Promise.resolve(2),
//     Promise.resolve(3)
//   ]);
// });