import type { Viewport } from '../../Viewport.js';
import type { Props as ViewProps } from '../../View.js';
import { Style } from '../../Style.js';
import { Chart, type ChartRange, type ChartLayout } from './Chart.js';
export interface BarChartProps<T> extends ViewProps {
    /** Extract the y-value from each data row */
    extract: (row: T) => number;
    /** Generate x-axis label for a data row */
    xLabels?: (row: T, index: number) => string;
    /** Generate y-axis label from a numeric value */
    yLabels?: (value: number) => string;
    /** Terminal columns per bar (default 1) */
    barWidth?: number;
    /** Gap between bars in terminal columns (default 0) */
    gap?: number;
    /** Style for the bars */
    style?: Style;
}
export declare class BarChart<T> extends Chart<T> {
    #private;
    constructor(data: T[], props: BarChartProps<T>);
    getXRange(): ChartRange;
    getYRange(): ChartRange;
    getXLabels(): string[];
    getYLabels(count: number): string[];
    renderChart(viewport: Viewport, layout: ChartLayout): void;
}