import type { WidgetRenderMeta, WidgetRenderOut, WidgetStats } from '../../client/lib/contract/types';
/** Render the card. Returns null when there is nothing to say (no log at all, or
 *  every day of the window is 0) — a chart of flat zeroes is an empty tile, and the
 *  family rule is 没有数据就不出现. */
declare function heatmapBarsRender(stats: WidgetStats, meta?: WidgetRenderMeta): WidgetRenderOut | null;
/** Preview usage log: a plausible working month — light weekends, a weekday
 *  baseline that swings, a heavy session every ten days — generated relative to
 *  TODAY the way the shared preview data is, so the preview shows the real card
 *  shape on any date with today on the right edge. A thunk, not a frozen literal: a
 *  long-lived session would otherwise leave the preview stranded in the past.
 *
 *  Every day is NON-ZERO on purpose: empty days are a real state of the live data,
 *  but in a preview they read as "the window does not cover 30 days" (a 3px muted
 *  stub is invisible), which is a defect report about the wrong thing. */
declare function previewStats(): Partial<WidgetStats>;
declare const _default: {
    id: string;
    name: () => string;
    desc: () => string;
    builtin: true;
    group: string;
    sizes: ("2x2" | "2x4")[];
    render: typeof heatmapBarsRender;
    configSchema: {
        key: string;
        label: () => string;
        type: "mode";
        default: string;
        options: [string, () => string][];
        hint: () => string;
    }[];
    example: {
        stats: typeof previewStats;
        sim: {
            range: string;
        };
        simSteps: {
            range: string;
        }[];
    };
    simToggle: () => string;
};
export default _default;