import { BaseListChatMessageHistory } from "@langchain/core/chat_history";
import { BaseMessage } from "@langchain/core/messages";
import { Collection } from "@datastax/astra-db-ts";
export interface AstraDBChatMessageHistoryInput {
    token: string;
    endpoint: string;
    collectionName: string;
    namespace?: string;
    sessionId: string;
}
export interface AstraDBChatMessageHistoryProps {
    collection: Collection;
    sessionId: string;
}
/**
 * Class for storing chat message history with Astra DB. It extends the
 * BaseListChatMessageHistory class and provides methods to get, add, and
 * clear messages.
 * @example
 *
 * ```typescript
 * const client = new AstraDB(
 *   process.env.ASTRA_DB_APPLICATION_TOKEN,
 *   process.env.ASTRA_DB_ENDPOINT,
 *   process.env.ASTRA_DB_NAMESPACE
 * );
 *
 * const collection = await client.collection("test_chat");
 *
 * const chatHistory = new AstraDBChatMessageHistory({
 *   collection,
 *   sessionId: "YOUR_SESSION_ID",
 * });
 *
 * const messages = await chatHistory.getMessages();
 *
 * await chatHistory.clear();
 */
export declare class AstraDBChatMessageHistory extends BaseListChatMessageHistory {
    lc_namespace: string[];
    private sessionId;
    private collection;
    constructor({ collection, sessionId }: AstraDBChatMessageHistoryProps);
    /**
     * async initializer function to return a new instance of AstraDBChatMessageHistory in a single step
     * @param AstraDBChatMessageHistoryInput
     * @returns Promise<AstraDBChatMessageHistory>
     *
     * @example
     * const chatHistory = await AstraDBChatMessageHistory.initialize({
     *  token: process.env.ASTRA_DB_APPLICATION_TOKEN,
     *  endpoint: process.env.ASTRA_DB_ENDPOINT,
     *  namespace: process.env.ASTRA_DB_NAMESPACE,
     *  collectionName:"test_chat",
     *  sessionId: "YOUR_SESSION_ID"
     * });
     */
    static initialize({ token, endpoint, collectionName, namespace, sessionId, }: AstraDBChatMessageHistoryInput): Promise<AstraDBChatMessageHistory>;
    getMessages(): Promise<BaseMessage[]>;
    addMessage(message: BaseMessage): Promise<void>;
    clear(): Promise<void>;
}