export interface HistogramDrawOptions {
    /**
     * The characters used to draw the box plot.
     * top-left, top-right, bottom-right, bottom-left, vertical, horizontal, left-T, right-T, bottom-T, top-T, cross
     */
    boxSymbols: string[];
    histoChars: string[];
}
export interface HistogramOptions {
    /** The entire table width in characters, including the axis labels, default is 80 */
    width?: number;
    /** The max width of the axis labels on the left, default is 10% of the width  */
    maxLabelWidth?: number;
    drawOptions?: Partial<HistogramDrawOptions>;
    /** The maximum value to show in the graph, defaults to the maximum value in the data. */
    max?: number;
    /** The minimum value to show in the graph, defaults to 0 or the the minimum value whichever is lower */
    min?: number;
    title?: string;
    /** Show the actual values. */
    showValues?: boolean;
    /** The number of significant digits to show in the values. */
    significantDigits?: number;
    /**
     * The colum headers.
     * The first column is the label, the second is the value, the third is the min value, and the fourth is the max value.
     */
    headers?: string[];
    /**
     * The chart type to use, defaults to 'bar'
     */
    type?: 'bar' | 'point' | 'point-min-max';
}
export type DataLine = readonly [label: string | number, value: number] | readonly [label: string | number, value: number, min: number, max: number];
export type Data = readonly DataLine[];
export declare function histogram(data: Data, options?: HistogramOptions): string;
/**
 * Generate a point line for a value
 * @param value - between 0 and 1 inclusive.
 * @param width - the width of the graph in characters
 * @param padding - optional padding character, defaults to space.
 * @param pointChar - optional point character, defaults to `●`
 * @returns a string of the point
 */
export declare function point(value: number, width: number, padding?: string, pointChar?: string): string;
/**
 *
 * @param value - between 0 and 1 inclusive.
 * @param minVal - the minimum value, defaults to the value
 * @param maxVal - the maximum value, defaults to the value
 * @param width - the width of the graph in characters
 * @param padding - optional padding character, defaults to space.
 * @param symbols - the symbols to use for the min, max, and value, defaults to `['●', '┣', '━', '┫']`
 * @returns
 */
export declare function pointMinMax(value: number, minVal: number | undefined, maxVal: number | undefined, width: number, padding?: string, symbols?: Readonly<string[]>): string;