export declare class StorageService {
    private parseSessionStorageValue;
    setSession(sessionId: string, sessionStart: Date): boolean;
    setMessage(message: unknown, sessionId: string): void;
    getChatHistory(): any;
    setQuickReplyValue(reply: string, messageKey: number, sessionId: string): void;
    overrideChatHistory(chatHistory: string): void;
}