when-am-i / files / scripts / lib / server.mts

server.mts

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`48a625b7` 2026-06-19 Pavel Safronov	1	// Dev-server lifecycle for the screenshot scripts: reuse a running Vite server
	2	// on 5173 if there is one, otherwise start one and stop it when finished.
	3
	4	import { spawn, type ChildProcess } from 'node:child_process';
	5	import http from 'node:http';
	6	import path from 'node:path';
	7	import { fileURLToPath } from 'node:url';
	8
	9	const __dirname = path.dirname(fileURLToPath(import.meta.url));
	10	export const REPO_ROOT = path.resolve(__dirname, '../..');
`68dcf3ed` 2026-06-25 Pavel Safronov	11
	12	// Port is overridable via SCREENSHOT_PORT so screenshots can be generated
	13	// against this checkout even when another Vite server (e.g. a parallel
	14	// Conductor workspace) already holds the default 5173. Defaults to 5173.
	15	const PORT = process.env.SCREENSHOT_PORT ?? '5173';
	16	export const BASE_URL = `http://127.0.0.1:${PORT}/when-am-i/`;
`48a625b7` 2026-06-19 Pavel Safronov	17
	18	function isUp(url: string): Promise<boolean> {
	19	return new Promise((resolve) => {
	20	const req = http.get(url, (res) => {
	21	res.resume();
	22	resolve(true);
	23	});
	24	req.on('error', () => resolve(false));
	25	req.setTimeout(1000, () => {
	26	req.destroy();
	27	resolve(false);
	28	});
	29	});
	30	}
	31
	32	const wait = (ms: number) => new Promise((r) => setTimeout(r, ms));
	33
	34	export interface DevServer {
	35	stop: () => void;
	36	}
	37
	38	export async function startDevServer(): Promise<DevServer> {
	39	if (await isUp(BASE_URL)) {
	40	console.log(' ℹ️ Reusing the dev server already running on :5173');
	41	return { stop: () => {} };
	42	}
	43
`68dcf3ed` 2026-06-25 Pavel Safronov	44	console.log(` 🚀 Starting Vite dev server on :${PORT}…`);
	45	const proc: ChildProcess = spawn('npx', ['vite', '--port', PORT, '--strictPort'], {
`48a625b7` 2026-06-19 Pavel Safronov	46	cwd: REPO_ROOT,
	47	stdio: 'ignore',
	48	});
	49
	50	const start = Date.now();
	51	while (Date.now() - start < 30_000) {
	52	if (await isUp(BASE_URL)) {
	53	console.log(' ✅ Dev server ready');
	54	return { stop: () => proc.kill() };
	55	}
	56	await wait(500);
	57	}
	58	proc.kill();
	59	throw new Error('Dev server did not start within 30s');
	60	}