public static function get_parent_plugin_slug(): string {
		if ( empty( self::$parent_plugin ) ) {
			$file = \Tribe__Main::instance()->get_parent_plugin_file_path();
			self::$parent_plugin = substr(
				$file,
				( strrpos( $file, '/' ) + 1 ),
				( strlen( $file ) - ( strrpos( $file, '/' ) + 5 ) )
			);
		}

		return self::$parent_plugin;
	}