import { Rect } from '../../types/misc';
import { ContinuousScale } from '../../types/scale';
import { FittedTickValues, TickValues } from './types';

/** Tick value identity across renders; `+value` so equal `Date`s match */
export declare const tickKey: (value: number | Date) => string;
/** Merges two tick sets, deduplicated and sorted */
export declare const mergeTickValues: (a: TickValues, b: TickValues) => TickValues;
/** Returns the tick values to render as marks, restricting the step to 1 or 5 × 10^k.
 * Every coarser "nice" step is then a multiple of the mark step, so the label sets picked by
 * {@link findFittingTickValues} land on existing marks and label changes don't add or remove
 * ticks — visibility toggles animate in CSS with no tick lifecycle management.
 * Time scales are returned as is: their tick intervals don't form a nested ladder. */
export declare function getNestedTickValues(scale: ContinuousScale, maxNumTicks: number, values?: TickValues): TickValues;
/** Generates candidate tick sets in decreasing size, from `maxNumTicks` down to a single tick.
 * Consecutive counts often produce the same "nice" values, so the sets are deduplicated. */
export declare function getTickValueCandidates(scale: ContinuousScale, maxNumTicks: number): TickValues[];
/** Generates candidate subsets of a custom tick list in decreasing size — every value,
 * every 2nd, every 3rd and so on, anchored at the first value so the labeled ticks
 * stay evenly spaced. Used when explicit `tickValues` are fitted adaptively. */
export declare function getTickValueSubsetCandidates(values: TickValues): TickValues[];
/** Finds the largest tick set whose labels don't overlap, among `candidates` ordered from
 * the densest to the sparsest (see {@link getTickValueCandidates}). Label rects come from
 * `getLabelRects`, which is expected to predict them without rendering (see
 * `Axis._getTickLabelRects`). The search stops at the first fitting candidate.
 * `tolerance` is forwarded to `resolveRectsOverlap`. */
export declare function findFittingTickValues(candidates: TickValues[], getLabelRects: (values: TickValues) => Rect[], tolerance?: number): FittedTickValues | undefined;