waving-hands/scripts/dev-all.mjs

// The game server and the site together, for playing locally: one terminal,
// each line marked with its side, and Ctrl-C (or either one stopping) stops both.
import { spawn } from 'node:child_process';

const sides = [
	['server', ['run', 'server']],
	['site', ['run', 'dev', '--', ...process.argv.slice(2)]]
];
const children = sides.map(([name, args]) => {
	const child = spawn('npm', args, { stdio: ['inherit', 'pipe', 'pipe'] });
	for (const stream of [child.stdout, child.stderr]) {
		let rest = '';
		stream.on('data', (chunk) => {
			const lines = (rest + chunk).split('\n');
			rest = lines.pop();
			for (const line of lines) console.log(`[${name}] ${line}`);
		});
	}
	child.on('exit', (code) => stop(code ?? 0));
	return child;
});

let stopping = false;
function stop(code) {
	if (stopping) return;
	stopping = true;
	for (const c of children) if (c.exitCode === null) c.kill('SIGTERM');
	process.exitCode = code;
}
process.on('SIGINT', () => stop(0));
process.on('SIGTERM', () => stop(0));