null\n    this._element = null\n    this._triggerArray = null\n    this._isTransitioning = null\n  }\n\n  // Private\n  _getConfig(config) {\n    config = {\n      ...Default,\n      ...config\n    }\n    config.toggle = Boolean(config.toggle) // Coerce string values\n    Util.typeCheckConfig(NAME, config, DefaultType)\n    return config\n  }\n\n  _getDimension() {\n    const hasWidth = $(this._element).hasClass(DIMENSION_WIDTH)\n    return hasWidth ? DIMENSION_WIDTH : DIMENSION_HEIGHT\n  }\n\n ...