import { Serializable } from "./load/serializable.js";
import { type BaseMessage } from "./messages/index.js";
/**
 * Base class for all chat message histories. All chat message histories
 * should extend this class.
 */
export declare abstract class BaseChatMessageHistory extends Serializable {
    abstract getMessages(): Promise<BaseMessage[]>;
    abstract addMessage(message: BaseMessage): Promise<void>;
    abstract addUserMessage(message: string): Promise<void>;
    abstract addAIChatMessage(message: string): Promise<void>;
    /**
     * Add a list of messages.
     *
     * Implementations should override this method to handle bulk addition of messages
     * in an efficient manner to avoid unnecessary round-trips to the underlying store.
     *
     * @param messages - A list of BaseMessage objects to store.
     */
    addMessages(messages: BaseMessage[]): Promise<void>;
    abstract clear(): Promise<void>;
}
/**
 * Base class for all list chat message histories. All list chat message
 * histories should extend this class.
 */
export declare abstract class BaseListChatMessageHistory extends Serializable {
    /** Returns a list of messages stored in the store. */
    abstract getMessages(): Promise<BaseMessage[]>;
    /**
     * Add a message object to the store.
     */
    abstract addMessage(message: BaseMessage): Promise<void>;
    /**
     * This is a convenience method for adding a human message string to the store.
     * Please note that this is a convenience method. Code should favor the
     * bulk addMessages interface instead to save on round-trips to the underlying
     * persistence layer.
     * This method may be deprecated in a future release.
     */
    addUserMessage(message: string): Promise<void>;
    /** @deprecated Use addAIMessage instead */
    addAIChatMessage(message: string): Promise<void>;
    /**
     * This is a convenience method for adding an AI message string to the store.
     * Please note that this is a convenience method. Code should favor the bulk
     * addMessages interface instead to save on round-trips to the underlying
     * persistence layer.
     * This method may be deprecated in a future release.
     */
    addAIMessage(message: string): Promise<void>;
    /**
     * Add a list of messages.
     *
     * Implementations should override this method to handle bulk addition of messages
     * in an efficient manner to avoid unnecessary round-trips to the underlying store.
     *
     * @param messages - A list of BaseMessage objects to store.
     */
    addMessages(messages: BaseMessage[]): Promise<void>;
    /**
     * Remove all messages from the store.
     */
    clear(): Promise<void>;
}
/**
 * Class for storing chat message history in-memory. It extends the
 * BaseListChatMessageHistory class and provides methods to get, add, and
 * clear messages.
 */
export declare class InMemoryChatMessageHistory extends BaseListChatMessageHistory {
    lc_namespace: string[];
    private messages;
    constructor(messages?: BaseMessage[]);
    /**
     * Method to get all the messages stored in the ChatMessageHistory
     * instance.
     * @returns Array of stored BaseMessage instances.
     */
    getMessages(): Promise<BaseMessage[]>;
    /**
     * Method to add a new message to the ChatMessageHistory instance.
     * @param message The BaseMessage instance to add.
     * @returns A promise that resolves when the message has been added.
     */
    addMessage(message: BaseMessage): Promise<void>;
    /**
     * Method to clear all the messages from the ChatMessageHistory instance.
     * @returns A promise that resolves when all messages have been cleared.
     */
    clear(): Promise<void>;
}