import { BaseMessage } from "@langchain/core/messages";
/**
 * 消息元数据，包含令牌计数
 */
export declare class MessageMetadata {
    inputTokens: number;
}
/**
 * 带有元数据的消息
 */
export declare class ManagedMessage {
    message: BaseMessage;
    metadata: MessageMetadata;
    constructor(message: BaseMessage, metadata?: MessageMetadata);
}
/**
 * 带有元数据的消息历史容器
 */
export declare class MessageHistory {
    messages: ManagedMessage[];
    totalTokens: number;
    /**
     * 添加带有元数据的消息
     */
    addMessage(message: BaseMessage, metadata: MessageMetadata, position?: number): void;
    /**
     * 从历史记录中移除消息
     */
    removeMessage(index?: number): void;
}