export type CartStore<T> = {
    read(): T[];
    write(items: T[]): void;
    add(item: T): void;
    clear(): void;
    subscribe(listener: () => void): () => void;
    getSnapshot(): T[];
};
/**
 * Create a cart store for a localStorage key. Pass `normalize` to migrate or
 * validate persisted items on read (e.g. drop legacy shapes, re-price).
 */
export declare const createCartStore: <T>(key: string, normalize?: (raw: unknown) => T[]) => CartStore<T>;