mirall-cli / node_modules / is-port-reachable / index.js

import net from 'node:net';

export default async function isPortReachable(port, {host, timeout = 1000} = {}) {
	if (typeof host !== 'string') {
		throw new TypeError('Specify a `host`');
	}

	const promise = new Promise(((resolve, reject) => {
		const socket = new net.Socket();

		const onError = () => {
			socket.destroy();
			reject();
		};

		socket.setTimeout(timeout);
		socket.once('error', onError);
		socket.once('timeout', onError);

		socket.connect(port, host, () => {
			socket.end();
			resolve();
		});
	}));

	try {
		await promise;
		return true;
	} catch {
		return false;
	}
}