Minimal localhost file server with TS support

server.js

const http = require('http');
const subproc = require('child_process');
const serveStatic = require('serve-static');

let compilelock = false;

const server = http.createServer((req, res) => {
	if (!compilelock && req.url?.includes('.js')) {
		compilelock = true;
		compileTS()
			.then((elapsed) => {
				console.log(`[${timestamp()}] Compiled in ${elapsed}s`);
			})
			.catch((err) => {
				console.error(`[${timestamp()}] Failed to compile. ${err}`);
			})
			.finally(() => {
				compilelock = false;
			});
	}
	serveStatic('.')(req, res, () => null);
});

const port = 3000;

server.listen(port, () => {
	const url = `http://localhost:${port}`;
	console.log(`Server listening at ${url}`);
	require('open')(url);
});

function compileTS() {
	const start = process.hrtime.bigint();
	return new Promise((resolve, reject) => {
		return subproc.exec('tsc --outDir build', (err, _, stderr) => {
			const error = err || stderr;
			if (error) {
				return reject(error);
			}
			const ms = Number((process.hrtime.bigint() - start) / BigInt(1e6));
			resolve(ms / 1e3);
		});
	});
}

const timestamp = () =>
	new Date().toLocaleTimeString('en-US', {
		hour: '2-digit',
		minute: '2-digit',
		second: '2-digit'
	});

Dependencies

"open": "^8.4.0",
"serve-static": "^1.15.0"

TS support is enabled by default and tsc is expected to be available at runtime. To disable, set compilelock to true.