import * as THREE from 'three';
/** Build a `NumberKeyframeTrack` for `targetPath` (one value per keyframe time). */
export declare function numberTrack(targetPath: string, times: number[], values: number[]): THREE.NumberKeyframeTrack;
/** Build a `VectorKeyframeTrack` for `targetPath` (three values per keyframe time). */
export declare function vectorTrack(targetPath: string, times: number[], values: number[]): THREE.VectorKeyframeTrack;
/** Build a `QuaternionKeyframeTrack` for `targetPath` (four values per keyframe time, slerped). */
export declare function quaternionTrack(targetPath: string, times: number[], values: number[]): THREE.QuaternionKeyframeTrack;
/** Declarative keyframe-track description consumed by {@link trackFromKeyframes}. `type` defaults to `'number'`. */
export interface TrackSpec {
    path: string;
    times: number[];
    values: number[];
    type?: 'number' | 'vector' | 'quaternion';
}
/** Build the matching `KeyframeTrack` subclass from a {@link TrackSpec}. */
export declare function trackFromKeyframes(spec: TrackSpec): THREE.KeyframeTrack;
/** Assemble tracks into a named `AnimationClip` of the given `duration` in seconds. */
export declare function clipFromTracks(name: string, duration: number, tracks: THREE.KeyframeTrack[]): THREE.AnimationClip;
/** Continuous 360° rotation around `axis`. Loops seamlessly. */
export declare function spinClip(axis?: 'x' | 'y' | 'z', duration?: number, name?: string): THREE.AnimationClip;
/** Vertical bob (sine, seamless loop). `amp` in world units. */
export declare function bobClip(amp?: number, duration?: number, name?: string): THREE.AnimationClip;
/** Uniform scale pulse between `min` and `max`. */
export declare function pulseScaleClip(min?: number, max?: number, duration?: number, name?: string): THREE.AnimationClip;
/**
 * Merge several clips into one, layering all their tracks. The result's
 * duration is the longest input duration.
 *
 * @param name - Name of the combined clip.
 * @param clips - Clips whose tracks are concatenated; tracks targeting the
 * same property will fight — combine complementary clips (spin + bob).
 * @returns One `AnimationClip` playing every input in parallel.
 */
export declare function combineClips(name: string, clips: THREE.AnimationClip[]): THREE.AnimationClip;
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