/**
 * Error thrown when attempting to access a state key that doesn't exist in strict mode.
 */
export declare class StateDoesNotExist extends Error {
    readonly key: string;
    readonly storage: string;
    /**
     * Creates a new StateDoesNotExist error.
     * @param key - The key that was not found
     * @param storage - The storage type where the key was not found
     */
    constructor(key: string, storage?: string);
}