export type TickFn = (dt: number) => void;
export declare class Ticker {
    private callbacks;
    private rafId;
    private lastTime;
    private _paused;
    private _speed;
    private _running;
    add(fn: TickFn): void;
    remove(fn: TickFn): void;
    start(): void;
    /**
     * Stop the RAF loop entirely (cancels requestAnimationFrame).
     * Calling start() after stop() will restart the loop from scratch.
     * Use pause()/resume() for lower-overhead temporary suspension.
     */
    stop(): void;
    pause(): void;
    resume(): void;
    setSpeed(multiplier: number): void;
    destroy(): void;
    get paused(): boolean;
    get speed(): number;
    get running(): boolean;
    private tick;
}
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