/**
 * Easing functions and the motion scale.
 *
 * Durations are tokens rather than magic numbers so motion stays consistent
 * across the ecosystem and can be scaled or disabled wholesale.
 *
 * @module utils/easing
 */
export type EasingFn = (t: number) => number;
export declare const EASINGS: Record<string, EasingFn>;
/**
 * The motion scale, in milliseconds.
 *
 * `instant` is for state that must not appear to move (a hover swap during rapid
 * pointer travel); `cinematic` is for narrative camera flights. Anything longer
 * than `deliberate` needs a reason.
 */
export declare const DURATIONS: {
    readonly instant: 0;
    readonly quick: 150;
    readonly normal: 350;
    readonly deliberate: 800;
    readonly cinematic: 1500;
};
export type DurationToken = keyof typeof DURATIONS;
export declare function resolveDuration(value: number | string | undefined, fallback?: number): number;
/**
 * Map `chart.animations.speed` onto a multiplier applied to every duration, so
 * one option speeds up or slows down the whole map coherently.
 */
export declare function speedFactor(speed: string | number | undefined): number;
export declare function resolveEase(ease: string | EasingFn | undefined, fallback?: string): EasingFn;
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