/**
 * Pluggable storage adapter for cross-platform persistence.
 *
 * Browser: localStorage adapter
 * React Native: AsyncStorage/MMKV adapter
 * Node/test: no-op adapter (default)
 */
export interface StorageAdapter {
    getItem(key: string): string | null;
    setItem(key: string, value: string): void;
    removeItem(key: string): void;
}
/** No-op storage — used when no adapter is provided. */
export declare const noopStorage: StorageAdapter;