@quasar/app-webpack/lib/utils/net.js

Quasar Framework App CLI with Webpack

const os = require('node:os')
const net = require('node:net')

module.exports.localHostList = ['0.0.0.0', 'localhost', '127.0.0.1', '::1']

module.exports.getExternalNetworkInterface =
  function getExternalNetworkInterface() {
    const networkInterfaces = os.networkInterfaces()
    const devices = []

    for (const deviceName of Object.keys(networkInterfaces)) {
      const networkInterface = networkInterfaces[deviceName]

      for (const networkAddress of networkInterface) {
        if (!networkAddress.internal && networkAddress.family === 'IPv4') {
          devices.push({ deviceName, ...networkAddress })
        }
      }
    }

    return devices
  }

module.exports.getIPs = function getIPs() {
  const networkInterfaces = os.networkInterfaces()
  const list = []

  for (const deviceName of Object.keys(networkInterfaces)) {
    const networkInterface = networkInterfaces[deviceName]

    for (const networkAddress of networkInterface) {
      if (networkAddress.family === 'IPv4') {
        list.push(networkAddress.address)
      }
    }
  }

  return list
}

module.exports.findClosestOpenPort = async function findClosestOpenPort(
  port,
  host
) {
  let portProposal = port

  do {
    if (await isPortAvailable(portProposal, host)) {
      return portProposal
    }
    portProposal++
  } while (portProposal < 65535)

  throw new Error('ERROR_NETWORK_PORT_NOT_AVAIL')
}

function isPortAvailable(port, host) {
  return new Promise((resolve, reject) => {
    const tester = net
      .createServer()
      .once('error', err => {
        if (err.code === 'EADDRNOTAVAIL') {
          reject(new Error('ERROR_NETWORK_ADDRESS_NOT_AVAIL'))
        } else if (err.code === 'EADDRINUSE') {
          resolve(false) // host/port in use
        } else {
          reject(err)
        }
      })
      .once('listening', () => {
        tester
          .once('close', () => {
            resolve(true) // found available host/port
          })
          .close()
      })
      .on('error', err => {
        reject(err)
      })
      .listen(port, host)
  })
}

module.exports.isPortAvailable = isPortAvailable