import type { ExternalTypes } from '../typing';
export interface PersistentStorageInterface {
    getToken: () => Promise<ExternalTypes.SessionToken | undefined>;
    setToken: (token: ExternalTypes.SessionToken) => Promise<void>;
    deleteToken: () => Promise<void>;
    getCartId: () => Promise<string | undefined>;
    setCartId: (cartId?: string) => Promise<void>;
    deleteCartId: () => Promise<void>;
}
export declare class PersistentStorage implements PersistentStorageInterface {
    readonly storageKeyPrefix: string;
    readonly customTokenStorageKey?: string | undefined;
    readonly customCartIdStorageKey?: string | undefined;
    constructor(storageKeyPrefix: string, customTokenStorageKey?: string | undefined, customCartIdStorageKey?: string | undefined);
    protected readonly tokenStorageKey: string;
    protected readonly cartIdStorageKey: string;
    getToken(): Promise<ExternalTypes.SessionToken | undefined>;
    setToken(token: ExternalTypes.SessionToken): Promise<void>;
    deleteToken(): Promise<void>;
    getCartId(): Promise<string | undefined>;
    setCartId(cartId?: string): Promise<void>;
    deleteCartId(): Promise<void>;
}