text: /* tslint:disable:no-null-keyword */
  /* tslint:disable:no-bitwise */
  var resolvedPromise = Promise.resolve(null);
  /**
   * @hidden
   */
  export var isPresent = function (value) { return value !== null && value !== undefined; };
  /**
   * @hidden
   */
  export var tick = function (f) { return (resolvedPromise.then(f)); };
  