AsyncLocalStorage-based Node server framework

als.mjs

import { createServer } from "node:http";
import { AsyncLocalStorage } from "node:async_hooks";

const asyncLocalStorage = new AsyncLocalStorage();

createServer((req, res) => {
	asyncLocalStorage.run({ req, res }, () => {
		asyncHandler().catch((err) => {
			console.error(err);
			if (!res.writableEnded) {
				res.statusCode = 500;
				res.end("Internal Server Error");
			}
		});
	});
}).listen(3000, () => {
	console.log("Server listening on http://localhost:3000");
});

// Define global request and response objects
Object.defineProperty(global, "request", {
	get() {
		return asyncLocalStorage.getStore().req;
	},
});

Object.defineProperty(global, "response", {
	get() {
		return asyncLocalStorage.getStore().res;
	},
});

async function asyncHandler() {
	// Do something async
	await new Promise((resolve) => setTimeout(resolve, 1000));

	// Use global request and response as you see fit
	response.end(`${request.method} ${request.url}`);
}