/**
 * Returns the full native-stack header height without importing an Expo Router
 * private path. Expo Router 55 and 56+ both register this named context on
 * the shared React Navigation elements registry, although the owning module
 * changed between those releases. When the context is unavailable, the hook
 * falls back to 44 points on iOS or 56 points on Android, plus the top safe
 * area, and never throws.
 */
export declare function useStackHeaderHeight(): number;
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