/**
 * Nice Numbers (Wilkinson) — pre-compute axis ticks so labels are clean
 * (`10, 20, 30` not `2.333, 4.667`). Spec: skills/lumen-chart/references/
 * chart-recipes.md → "Nice Numbers (axis ticks)".
 *
 * Pure function. No I/O, no globals.
 */
export interface NiceNumbersResult {
    /** Tick values from `niceMin` to `niceMax` (inclusive), evenly spaced by `niceSpacing`. */
    ticks: number[];
    /** Floor-rounded minimum that fits the data, snapped to a nice tick. */
    niceMin: number;
    /** Ceil-rounded maximum that fits the data, snapped to a nice tick. */
    niceMax: number;
    /** Spacing between consecutive ticks. */
    niceSpacing: number;
}
export interface NiceNumbersOptions {
    /** Target number of ticks. Final count is usually within ±2 of this. Default 6. */
    desiredTickCount?: number;
}
/**
 * Compute nice axis ticks for a data range.
 *
 * @param min  smallest data value
 * @param max  largest data value (must be >= min)
 */
export declare function niceNumbers(min: number, max: number, { desiredTickCount }?: NiceNumbersOptions): NiceNumbersResult;
/**
 * Format a tick value for display. Uses the spacing's implied decimal precision
 * so axes don't show 6+ decimal trailing zeros.
 */
export declare function formatTick(value: number, spacing: number): string;
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