Transparent worker pool demo, with WorkTank and Esbuild.

build.js

/* IMPORT */

import esbuild from 'esbuild';
import worktank from 'worktank-esbuild-plugin';

/* MAIN */

esbuild.build ({
  bundle: true,
  minify: true,
  format: 'esm',
  platform: 'node',
  target: 'es2018',
  entryPoints: ['example.ts'],
  outdir: 'dist',
  plugins: [
    worktank ({
      filter: /\.worker\.(js|ts)$/
    })
  ]
});

example.ts

// Instructions:
// Install dependencies: npm install
// Compile the example with esbuild: node build.js
// Run the compiled example: node dist/example.js

/* IMPORT */

import {id, sum} from './example.worker';
import process from 'node:process';

/* MAIN */

const test = async (): Promise<void> => {

  console.assert ( await sum ( 10, 5 ) === 15 );

  const ids = await Promise.all ([ id (), id (), id () ]);

  console.log ( 'IDs:', ids );

  process.exit ();

};

/* RUN */

test ();

example.worker.ts

/* IMPORT */

import {threadId} from 'worker_threads';

/* MAIN */

const id = async (): Promise<number> => threadId;
const sum = async ( a: number, b: number ) => a + b;

/* EXPORT */

export {id, sum};

package.json

{
  "private": true,
  "name": "test",
  "type": "module",
  "scripts": {
    "compile": "node build.js"
  },
  "dependencies": {
    "worktank": "^3.0.2"
  },
  "devDependencies": {
    "@types/node": "^22.15.29",
    "esbuild": "^0.25.5",
    "worktank-esbuild-plugin": "^2.0.0"
  }
}