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/** * Copyright (c) 2017 ~ present NAVER Corp. * billboard.js project is licensed under the MIT license */import {isUndefined} from "../../module/util";
export default {	/**	 * Update groups for the targets.	 * @function groups	 * @instance	 * @memberof Chart	 * @param {Array} groups This argument needs to be an Array that includes one or more Array that includes target ids to be grouped.	 * @returns {Array} Grouped data names array	 * @example	 *  // data1 and data2 will be a new group.	 *  chart.groups([	 *     ["data1", "data2"]	 *  ]);	 */	groups(groups: string[][]): string[][] {		const $$ = this.internal;		const {config} = $$;
		if (isUndefined(groups)) {			return config.data_groups;		}
		config.data_groups = groups;		$$.redraw();
		return config.data_groups;	}};