import { BaseChatMessageHistory } from "@langchain/core/chat_history";
import { BaseMemory, InputValues, OutputValues } from "@langchain/core/memory";
/**
 * Interface for the input parameters of the BaseChatMemory class.
 */
export interface BaseChatMemoryInput {
    chatHistory?: BaseChatMessageHistory;
    returnMessages?: boolean;
    inputKey?: string;
    outputKey?: string;
}
/**
 * Abstract class that provides a base for implementing different types of
 * memory systems. It is designed to maintain the state of an application,
 * specifically the history of a conversation. This class is typically
 * extended by other classes to create specific types of memory systems.
 */
export declare abstract class BaseChatMemory extends BaseMemory {
    chatHistory: BaseChatMessageHistory;
    returnMessages: boolean;
    inputKey?: string;
    outputKey?: string;
    constructor(fields?: BaseChatMemoryInput);
    /**
     * Method to add user and AI messages to the chat history in sequence.
     * @param inputValues The input values from the user.
     * @param outputValues The output values from the AI.
     * @returns Promise that resolves when the context has been saved.
     */
    saveContext(inputValues: InputValues, outputValues: OutputValues): Promise<void>;
    /**
     * Method to clear the chat history.
     * @returns Promise that resolves when the chat history has been cleared.
     */
    clear(): Promise<void>;
}