/**
 * Close an open overlay on Android's hardware or gesture back: while `active`, back calls
 * `onBack` and is consumed, so the app neither navigates nor exits under the overlay. A
 * no-op on iOS, and never subscribed on the web.
 */
export declare function useHardwareBack(
/** Subscribe only while true (pass the overlay's open state). */
active: boolean, 
/** Called when hardware back is pressed while active; the event is consumed. */
onBack: () => void): void;
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