/** High-resolution elapsed time tracker. */
export declare class Clock {
    #private;
    constructor(autoStart?: boolean);
    /** Total elapsed time in seconds since the clock started. */
    get elapsedTime(): number;
    /**
     * Time in seconds since the last call to `.delta`.
     * Auto-starts the clock on first access if autoStart is true.
     */
    get delta(): number;
    /** Start or restart the clock. */
    start(): void;
    /** Stop the clock and disable auto-start. */
    stop(): void;
}
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