import type { FrameEvent } from '../../core/frame.js';
/**
 * Frame rate statistics returned by `useFps`.
 */
export type FpsStats = {
    /** Current frames per second (rolling average over the sample window). */
    fps: number;
    /** Last frame duration in milliseconds. */
    lastFrameMs: number;
    /** Total frames counted since mount. */
    totalFrames: number;
    /** Per-phase timing from the most recent frame (if available). */
    phases: FrameEvent['phases'] | undefined;
};
/**
 * Hook that measures the actual terminal rendering frame rate.
 *
 * Subscribes to Ink's frame events and computes a rolling FPS average.
 * Returns `{ fps, lastFrameMs, totalFrames, phases }`.
 *
 * @param sampleWindowMs - Rolling window for FPS calculation (default 1000ms)
 */
export declare function useFps(sampleWindowMs?: number): FpsStats;
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