/**
 * Robust fallback wrapper for native `requestAnimationFrame`.
 *
 * Schedules a callback to be run before the next browser repaint.
 * If the environment does not support `requestAnimationFrame` (e.g., Node.js, Bun, or Web Workers),
 * it falls back to a timer that simulates a ~30 frames-per-second (33.3ms) refresh rate.
 *
 * @param callback - The function to execute before the next repaint. Receives a high-resolution timestamp.
 * @returns A unique request ID that can be used to cancel the request.
 *
 * @example
 * ```ts
 * requestAnimationFrame((timestamp) => {
 *   console.log('Frame timestamp:', timestamp);
 * });
 * ```
 */
export declare const requestAnimationFrame: (callback: FrameRequestCallback) => number;
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