export type StorageType = {
    getItem(key: string): string | null;
    setItem(key: string, value: string): void;
    removeItem(key: string): void;
    key(index: number): string | null;
    readonly length: number;
};
/**
 * Returns the default storage instance.
 * In browser/desktop (Electron) environments, this is typically localStorage.
 */
export declare function getDefaultStorage(): StorageType;
export declare function getStorageKeys(storage?: StorageType): string[];
export declare function hasStorageItem(key: string, storage?: StorageType): boolean;
export declare function getStorageItem(key: string, storage?: StorageType): string | null;
export declare function setStorageItem(key: string, value: string, storage?: StorageType): void;
export declare function updateStorageItem(key: string, updateFn: (currentValue: string | null) => string, storage?: StorageType): void;
export declare function removeStorageItem(key: string, storage?: StorageType): void;