/** Cancels a frame scheduled via FrameDriver.schedule. */
export type CancelFrame = () => void;
/**
 * Source of display frames. The production driver wraps requestAnimationFrame;
 * tests inject a manual driver to control timestamps deterministically.
 * The scheduler is the only consumer - no other module may schedule frames.
 */
export interface FrameDriver {
    schedule(callback: (timestampMs: number) => void): CancelFrame;
}
export declare const rafDriver: FrameDriver;
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