Pierre-Do / promise-scheduler

A very simple promise scheduler to resolve promises with workers

Promise Scheduler

The goal of this repo is to implement a very simple resolvePromiseWithWorkers Javascript promise utility to resolve a bunch of Promise not one by one or all at once, but by workers.

Example

import resolvePromiseWithWorkers from "./src/resolvePromiseWithWorkers";

// A simple function that download something
async function downloadValue(): Promise<unknown> {
  console.log("Starting download");
  const response = await fetch("https://jsonplaceholder.typicode.com/todos/1");

  const result = await response.text();
  console.log("Download completed");

  return result;
}

// A few downloads that need to be done.
// The promise must be wrapped in a closure to avoid to
// resolve all promises as soon as they're instanciated.
const factories = [
  () => downloadValue(),
  () => downloadValue(),
  () => downloadValue(),
  () => downloadValue(),
  () => downloadValue(),
  () => downloadValue(),
  () => downloadValue(),
];

// Two workers will download the files
const result = await resolvePromiseWithWorkers(factories, { workerCount: 2 });

Acknowledgments

Inspired by the work of Alex Ewerlöf.