import ndarray from "ndarray";
export interface BinConfig {
    /**
     * The start of the range.
     */
    start: number;
    /**
     * The end of the range.
     */
    stop: number;
    /**
     * The size of bin steps.
     */
    step: number;
}
export interface Result {
    /**
     * Start of the time bin.
     */
    x: number;
    /**
     * Start fo teh value bin.
     */
    y: number;
    /**
     * Computed density.
     */
    value: number;
}
/**
 * Compute a density heatmap.
 * @param data The time series data as an ndarray.
 * @param binX Configuration for the binning along the time dimension.
 * @param binY Configuration for the binning along the value dimension.
 * @param canvas The canvas for the webgl context and for debug output.
 */
export default function (data: ndarray, binX: BinConfig, binY: BinConfig, canvas?: HTMLCanvasElement): Promise<Result[]>;