/** Wait through several unchanged frames, rather than mistaking one quiet frame for rest. */
export declare const IDLE_SETTLE_MS = 160;
export declare function nextQuietTime(previous: number, changed: boolean, dt: number): number;
/**
 * Opt-in UI-runtime RAF loop. Inputs wake it without a JS-thread round trip.
 * `tick` returns true while work changed or a continuous effect needs frames.
 * `prepare` must read INPUTS only: subscribing to tick outputs causes feedback.
 * A generation token makes queued frames harmless after replacement/unmount.
 */
export declare function useDemandFrameLoop(enabled: boolean, prepare: () => unknown, tick: (dt: number) => boolean): () => void;
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