/**
 * A custom React hook for managing persistent state stored on a server.
 *
 * @template T - The type of the state to be persisted.
 * @param {T} defaultState - The initial state to use if no persisted state is found.
 * @returns {Object} - An object containing:
 *   - `key` (string | null): The current key identifying the persisted state on the server.
 *   - `state` (T): The current persisted state value.
 *   - `expiresAt` (number): The expiration time of the state (timestamp).
 *   - `setPersistentState` (function): A function to update the state on the server and locally.
 *   - `error` (string | null): The error message, if any.
 *   - `clearError` (function): A function to clear the error state.
 */
export declare const usePersistentState: <T>(defaultState: T) => {
    key: string | null;
    state: T;
    expiresAt: number;
    setPersistentState: (newState: T) => Promise<void>;
    error: string | null;
    clearError: () => void;
};