import { Observable } from 'rxjs';
export declare abstract class CartVoucherAdapter {
    /**
     * Abstract method used to apply voucher to cart
     *
     * @param userId
     * @param cartId
     * @param voucherId
     */
    abstract add(userId: string, cartId: string, voucherId: string): Observable<{}>;
    /**
     * Abstract method used to remove voucher from cart
     *
     * @param userId
     * @param cartId
     * @param voucherId
     */
    abstract remove(userId: string, cartId: string, voucherId: string): Observable<{}>;
}