message: fix(Notification): Don't reference `this` from static methods.
diff: @@ -107,7 +107,7 @@ export class Notification<T> {
  if (typeof value !== 'undefined') {
  return new Notification('N', value);
  }
  - return this.undefinedValueNotification;
  + return Notification.undefinedValueNotification;
  }
  /**
  @@ -126,6 +126,6 @@ export class Notification<T> {
  * @return {Notification<any>} The valueless "complete" Notification.
  */
  static createComplete(): Notification<any> {
  - return this.completeNotification;
  + return Notification.completeNotification;
  }
  }
  