Method constructor

lib/ResourceRequest.js:22–30

* [constructor description] * @param {Number} ttl timeout

(ttl, Promise)

   * @param  {Number} ttl     timeout
   */
  constructor(ttl, Promise) {
    super(Promise);
    this._creationTimestamp = Date.now();
    this._timeout = null;

    if (ttl !== undefined) {
      this.setTimeout(ttl);
    }
  }

  setTimeout(delay) {
    if (this._state !== ResourceRequest.PENDING) {