/**
 * Stores state in `sessionStorage` and keeps it in sync.
 * Mirrors the API of `useLocalStorage`.
 *
 * @template T - Type of the stored value
 * @param key - Storage key
 * @param initial - Initial / fallback value
 * @returns A tuple `[value, setValue]` similar to `useState`
 *
 * @example
 * const [step, setStep] = useSessionStorage("wizard-step", 0);
 */
export declare const useSessionStorage: <T>(key: string, initial: T) => readonly [T, (newValue: T) => void];
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