interface UseBrightnessOptions {
    /** Restore the original brightness when the component unmounts. Default: true */
    restoreOnUnmount?: boolean;
}
interface UseBrightnessResult {
    /** Current app brightness (0–1), null while loading */
    brightness: number | null;
    /** Set app brightness (0–1) */
    setBrightness: (value: number) => Promise<void>;
    isLoading: boolean;
    error: Error | null;
}
export declare function useBrightness({ restoreOnUnmount }?: UseBrightnessOptions): UseBrightnessResult;
export {};
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