export declare const useTimer: ({ initialDuration, enabled, onEnd, }: {
    initialDuration: number;
    enabled: boolean;
    onEnd: () => void;
}) => {
    duration: number;
    elapsedFraction: number;
    startTime: number;
    endTime: number;
    stopped: boolean;
    startWithDuration: (duration: number) => void;
    stop: () => void;
};
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