import { Redis, type RedisConfigNodejs } from "@upstash/redis";
import { BaseListChatMessageHistory } from "@langchain/core/chat_history";
import { BaseMessage } from "@langchain/core/messages";
/**
 * Type definition for the input parameters required to initialize an
 * instance of the UpstashRedisChatMessageHistory class.
 */
export type UpstashRedisChatMessageHistoryInput = {
    sessionId: string;
    sessionTTL?: number;
    config?: RedisConfigNodejs;
    client?: Redis;
};
/**
 * Class used to store chat message history in Redis. It provides methods
 * to add, get, and clear messages.
 */
export declare class UpstashRedisChatMessageHistory extends BaseListChatMessageHistory {
    lc_namespace: string[];
    get lc_secrets(): {
        "config.url": string;
        "config.token": string;
    };
    client: Redis;
    private sessionId;
    private sessionTTL?;
    constructor(fields: UpstashRedisChatMessageHistoryInput);
    /**
     * Retrieves the chat messages from the Redis database.
     * @returns An array of BaseMessage instances representing the chat history.
     */
    getMessages(): Promise<BaseMessage[]>;
    /**
     * Adds a new message to the chat history in the Redis database.
     * @param message The message to be added to the chat history.
     * @returns Promise resolving to void.
     */
    addMessage(message: BaseMessage): Promise<void>;
    /**
     * Deletes all messages from the chat history in the Redis database.
     * @returns Promise resolving to void.
     */
    clear(): Promise<void>;
}