billboard.js/types/plugin/sparkline/options.d.ts

Re-usable easy interface JavaScript chart library, based on D3 v4+

export interface SparklineOptions {
	/**
	 * Specify sparkline charts holder selector.
	 * - **NOTE:** The amount of holder should match with the amount of data. If has less, will append necessaray amount nodes as sibling of main chart.
	 */
	selector: string;
}