Furikake

export async function isPortFree(port: number) { if (port) { const isPortInUse = await new Promise((resolve) => { const net = require("net"); const server = net.createServer(); server.once("error", (err: any) => { if (err.code === "EADDRINUSE") { resolve(true); } else { resolve(false); } }); server.once("listening", () => { server.close(); resolve(false); }); server.listen(port); }); if (isPortInUse) { return false; } return true; } }