/**
 * Animation utility functions
 * Helper functions for animation operations
 */
import { Animation } from './animation';
import { Keyframe } from './keyframe';
/**
 * Snap time to nearest grid point
 */
export declare function snapTime(time: number, snapping?: number): number;
/**
 * Get animation duration from keyframes
 */
export declare function getAnimationDurationFromKeyframes(keyframes: Keyframe[]): number;
/**
 * Find keyframes in time range
 */
export declare function findKeyframesInRange(keyframes: Keyframe[], startTime: number, endTime: number): Keyframe[];
/**
 * Get keyframe before time
 */
export declare function getKeyframeBefore(keyframes: Keyframe[], time: number): Keyframe | undefined;
/**
 * Get keyframe after time
 */
export declare function getKeyframeAfter(keyframes: Keyframe[], time: number): Keyframe | undefined;
/**
 * Get keyframes at time (within epsilon)
 */
export declare function getKeyframesAtTime(keyframes: Keyframe[], time: number, epsilon?: number): Keyframe[];
/**
 * Sort keyframes by time
 */
export declare function sortKeyframesByTime(keyframes: Keyframe[]): Keyframe[];
/**
 * Remove duplicate keyframes (same time and channel)
 */
export declare function removeDuplicateKeyframes(keyframes: Keyframe[]): Keyframe[];
/**
 * Get all channels used in keyframes
 */
export declare function getChannelsFromKeyframes(keyframes: Keyframe[]): string[];
/**
 * Group keyframes by channel
 */
export declare function groupKeyframesByChannel(keyframes: Keyframe[]): Record<string, Keyframe[]>;
/**
 * Calculate animation FPS from keyframes
 */
export declare function calculateAnimationFPS(keyframes: Keyframe[]): number;
/**
 * Check if animation is looping
 */
export declare function isAnimationLooping(animation: Animation): boolean;
/**
 * Check if animation should hold at end
 */
export declare function shouldAnimationHold(animation: Animation): boolean;
/**
 * Get effective animation length (accounting for keyframes)
 */
export declare function getEffectiveAnimationLength(animation: Animation): number;
/**
 * Normalize animation time (handle looping)
 */
export declare function normalizeAnimationTime(time: number, animation: Animation): number;
/**
 * Check if time is within animation bounds
 */
export declare function isTimeInAnimation(time: number, animation: Animation): boolean;
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