@modern-js/utils/dist/esm/cli/port.mjs

A Progressive React Framework for modern web development.

import net from "net";
import { chalk } from "../compiled.mjs";
import { logger } from "./logger.mjs";
const getPort = async (expectPort, { tryLimits = 20, strictPort = false, slient = false } = {})=>{
    let port = expectPort;
    if ('string' == typeof port) port = parseInt(port, 10);
    if (strictPort) tryLimits = 1;
    const original = port;
    let found = false;
    let attempts = 0;
    while(!found && attempts <= tryLimits)try {
        await new Promise((resolve, reject)=>{
            const server = net.createServer();
            server.unref();
            server.on('error', reject);
            server.listen({
                port,
                host: '0.0.0.0'
            }, ()=>{
                found = true;
                server.close(resolve);
            });
        });
    } catch (e) {
        if ('EADDRINUSE' !== e.code) throw e;
        port++;
        attempts++;
    }
    if (port !== original) {
        if (strictPort) throw new Error(`Port "${original}" is occupied, please choose another one.`);
        else if (!slient) logger.info(`Port ${original} is in use. ${chalk.yellow(`using port ${port}.`)}`);
    }
    return port;
};
export { getPort };