/**
 * ZUI Easing Functions
 * Animation easing based on ZeppOS design specifications
 */
import type { EasingFunction, EasingName } from '../core/types';
/**
 * Create cubic bezier easing function
 * @param x1 - First control point X
 * @param y1 - First control point Y
 * @param x2 - Second control point X
 * @param y2 - Second control point Y
 */
export declare function cubicBezier(x1: number, y1: number, x2: number, y2: number): EasingFunction;
/**
 * Linear easing (no easing)
 */
export declare const linear: EasingFunction;
/**
 * Ease-In: Movement out of visible range
 * cubic-bezier(0.42, 0, 1, 1)
 */
export declare const easeIn: EasingFunction;
/**
 * Ease-Out: Movement into visible range
 * cubic-bezier(0, 0, 0.58, 1)
 */
export declare const easeOut: EasingFunction;
/**
 * Ease-In-Out: Movement within visible range
 * cubic-bezier(0.42, 0, 0.58, 1)
 */
export declare const easeInOut: EasingFunction;
/**
 * Ease-In-Quad
 */
export declare const easeInQuad: EasingFunction;
/**
 * Ease-Out-Quad
 */
export declare const easeOutQuad: EasingFunction;
/**
 * Ease-In-Out-Quad
 */
export declare const easeInOutQuad: EasingFunction;
/**
 * Ease-In-Cubic
 */
export declare const easeInCubic: EasingFunction;
/**
 * Ease-Out-Cubic
 */
export declare const easeOutCubic: EasingFunction;
/**
 * Ease-In-Out-Cubic
 */
export declare const easeInOutCubic: EasingFunction;
/**
 * Bounce easing
 */
export declare const easeOutBounce: EasingFunction;
/**
 * Elastic easing (for emphasis)
 */
export declare const easeOutElastic: EasingFunction;
/**
 * Map of easing names to functions
 */
export declare const easingFunctions: Record<EasingName, EasingFunction>;
/**
 * Get easing function by name or return custom function
 * @param easing - Easing name or function
 */
export declare function getEasing(easing: EasingName | EasingFunction): EasingFunction;
/**
 * Standard animation durations (in milliseconds)
 * Based on ZeppOS specifications
 */
export declare const animationDurations: {
    readonly shortest: 100;
    readonly short: 200;
    readonly medium: 300;
    readonly long: 400;
};
export type AnimationDuration = keyof typeof animationDurations;
/**
 * Get animation duration by key or return numeric value
 */
export declare function getDuration(duration: AnimationDuration | number): number;
/**
 * Calculate deceleration curve for crown scroll stop
 * @param velocity - Current scroll velocity
 * @param friction - Friction coefficient (0-1)
 */
export declare function getDecelerationDuration(velocity: number, friction?: number): number;
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