*greenlet-node.md

Greenlet for Node worker_threads

Works with ESM and CommonJS.

import greenlet from 'greenlet-node';

const add = greenlet(async (a, b) => {
  return a + b;
});

await add(1, 2);

Example 2:

import greenlet from 'greenlet-node';

const add = greenlet(async (a, b) => {
  const someLib = require('some-lib');
  return someLib.add(a, b);
});

await add(1, 2);

greenlet-node.js

const { Worker } = require('worker_threads');

/** @template {(...a:any)=>any} T @type {(fn: T) => (...args: Parameters<T>) => Promise<ReturnType<T>>} */
module.exports = function greenlet(fn) {
	let w,
		ids = 0;
	return (...args) =>
		new Promise((resolve, reject) => {
			if (!w) {
				w = new Worker(
					`((p, fn) => p.on('message',async([id,args]) => {
						try { p.postMessage([id, true, await fn.apply(null, args)]) }
						catch (e) { p.postMessage([id, false, String(e && e.stack || e)]) }
					}))(require('worker_threads').parentPort, ${fn})`,
					{ eval: true }
				);
			}
			let id = ++ids;
			w.on('message', function h([rid, success, result]) {
				if (rid == id) w.removeListener('message', h), (success ? resolve : reject)(result);
			});
			w.postMessage([id, args]);
		});
}

greenlet-node.mjs

import greenlet from './greenlet-node.js';
export default greenlet;

package.json

{
  "name": "greenlet-node",
  "version": "0.0.1",
  "main": "./greenlet-node.js",
  "exports": {
    "import": "./greenlet-node.mjs",
    "default": "./greenlet-node.js"
  }
}

Hi it seems like that this package is not published yet, can I help and publish this as a package for my own use? I think it will be more appropriate if you would publish it or I try to make a pull request to greenlet and make it usable in both browser and node?