import net from 'node:net'

export function findAvailableHostedLoopbackPort() {
  return new Promise((resolve, reject) => {
    const server = net.createServer()
    server.unref()
    server.once('error', reject)
    server.listen({ host: '127.0.0.1', port: 0 }, () => {
      const address = server.address()
      server.close(() =>
        typeof address === 'object' && address
          ? resolve(address.port)
          : reject(new Error('No port'))
      )
    })
  })
}