dispose() {
    /* $FlowFixMe[incompatible-call] (>=0.63.0 site=react_native_fb) This
     * comment suppresses an error found when Flow v0.63 was deployed. To see
     * the error delete this comment and run Flow. */
    this._timers.forEach(clearTimeout);
  }
Cleanup, e.g. on unmount. Clears any pending timers.