Function start

lib/create_response.js:27–32

(controller)

    ? null
    : new ReadableStream({
        start(controller) {
          message.on('data', chunk => controller.enqueue(chunk))
          message.on('end', () => controller.close())
          message.on('error', error => controller.error(error))
          signal.addEventListener('abort', () => message.destroy(signal.reason))
        },
        cancel() {
          message.destroy()
        },