/** Session-owned active render time. No timers, global state, or mesh callbacks. */
export declare class RuntimeClock {
    #private;
    subscribe(listener: (deltaMs: number) => void): () => void;
    tick(now: number): void;
    /** Already bounded/scaled by the session loop; do not apply a second clamp. */
    advance(deltaMs: number): void;
    resetInterval(): void;
    dispose(): void;
}
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