Function getAvailablePort

scripts/browser-automation.ts:96–121

(requestedPort: number | null = null)

}

export async function getAvailablePort(requestedPort: number | null = null): Promise<number> {
  if (requestedPort !== null && Number.isFinite(requestedPort) && requestedPort > 0) {
    return requestedPort
  }

  return await new Promise((resolve, reject) => {
    const server = createNetServer()
    server.once('error', reject)
    server.listen(0, '127.0.0.1', () => {
      const address = server.address()
      if (address === null || typeof address === 'string') {
        reject(new Error('Failed to allocate a free port'))
        return
      }

      const { port } = address
      server.close(error => {
        if (error) {
          reject(error)
          return
        }
        resolve(port)
      })
    })
  })
}

const LOCK_DIR = join(process.env['TMPDIR'] ?? '/tmp', 'pretext-browser-automation-locks')