/**
 * Like `useState`, but initializing from `localStorage` if available and saving
 * to `localStorage` everytime the state is changed.
 * @param key localStorage key. Will be appended to the `react-iframe-bridge-` prefix.
 * @param initialValue Value to use if the storage is empty.
 */
export declare function useLocalStorage<ValueType>(key: string, initialValue: ValueType): readonly [ValueType, (value: ValueType) => void];
/**
 * Save the provided value to `localStorage` everytime it changes.
 * @param key localStorage key. Will be appended to the `react-iframe-bridge-` prefix.
 * @param value Value to save.
 */
export declare function useSaveToLocalStorage(key: string, value: unknown): void;
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