block14.js

this._viewableIndices = viewableIndices;
 if (this._config.minimumViewTime) {
      const handle = setTimeout(() => {
        this._timers.delete(handle);
        this._onUpdateSync(
          viewableIndices,
          onViewableItemsChanged,
          createViewToken,
        );
      }, this._config.minimumViewTime);
      this._timers.add(handle);
    } else {
      this._onUpdateSync(
        viewableIndices,
        onViewableItemsChanged,
        createViewToken,
      );
    }