import type { TrackSamples } from '../../core/types';
import { type Interpolator } from '../../core/interpolators';
/**
 * Query a merged track at a precise time.
 *
 * Returns a `Float32Array` of length `track.stride` — the interpolated sample
 * at `time`. Returns `null` when the track is absent or has fewer than 2
 * samples.
 *
 * The output buffer is reused across renders; the interpolator writes into it
 * in place. Do not retain the returned array across renders — it mutates.
 *
 * Default interpolator is `lerp` (per-component linear). For quaternion
 * orientation data pass `slerpQuat`; for categorical data pass `step` or
 * `nearest`.
 *
 * @example
 * ```tsx
 * const time = useClockValue(clock, 30);
 * const { tracks } = useMergedTrack(engine, clock);
 * const position = useTrackSample(tracks.get('data'), time);
 * const orientation = useTrackSample(quatTrack, time, slerpQuat);
 * ```
 */
export declare function useTrackSample(track: TrackSamples | undefined, time: number, interp?: Interpolator): Float32Array | null;
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