/**
 * Find the keyframe bracket for time `t` with temporal coherence.
 *
 * Returns `[index, alpha]`:
 * - `index`: left keyframe index in the times array
 * - `alpha`: interpolation factor 0..1 between times[index] and times[index+1]
 *
 * Performance:
 * - O(1) amortized during sequential playback (temporal coherence via hint)
 * - O(log n) on seeks or large jumps (binary search fallback)
 *
 * Ported from vuer-ts animation_tracks/utils/findBracket.ts
 *
 * @param times  Sorted array of keyframe timestamps
 * @param t      Current time to look up
 * @param hint   Last returned index (for temporal coherence)
 */
export declare function findBracket(times: Float32Array, t: number, hint: number): [index: number, alpha: number];
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