@jpwilliams/waitgroup

A tiny version of Golang's WaitGroup.

• Tiny (<1kB)
• Works with <img alt="browsers" title="This package works with browsers." height="16px" src="https://jsr.io/logos/browsers.svg" /> <img alt="Deno" title="This package works with Deno." height="16px" src="https://jsr.io/logos/deno.svg" /> <img alt="Node.js" title="This package works with Node.js" height="16px" src="https://jsr.io/logos/node.svg" /> <img alt="Cloudflare Workers" title="This package works with Cloudflare Workers." height="16px" src="https://jsr.io/logos/cloudflare-workers.svg" /> <img alt="Bun" title="This package works with Bun." height="16px" src="https://jsr.io/logos/bun.svg" />
• Typed
• Zero dependencies 🎉

There are too many package managers 🥲

# From npm
npm install @jpwilliams/waitgroup
yarn add @jpwilliams/waitgroup
pnpm add @jpwilliams/waitgroup

# From JSR
npx jsr add @jpwilliams/waitgroup
bunx jsr add @jpwilliams/waitgroup
deno add @jpwilliams/waitgroup
yarn dlx jsr add @jpwilliams/waitgroup
pnpm dlx jsr add @jpwilliams/waitgroup

import http from "http";
import { WaitGroup } from "@jpwilliams/waitgroup";

async function main() {
  const wg = new WaitGroup();

  const urls = [
    "http://www.golang.org/",
    "http://www.google.com/",
    "http://www.somestupidname.com/",
  ];

  urls.forEach((url) => {
    // Increment the WaitGroup counter
    wg.add(1);
    // Fetch the URL
    http.get(url, () => {
      // Decrement the counter when the GET is complete
      wg.done();
    });
  });

  // Wait for all HTTP fetches to complete
  await wg.wait();
}

main();

For most applications in Node.js, using built-ins like Promise.all will work perfectly, but sometimes this can be a really nice abstraction if the promises you have to keep track of are pretty spread out.

See jpwilliams/waitgroup-deno for a strictly Deno version, or @jpwilliams/waitgroup on JSR.