/**
 * The following code is modified based on
 * https://github.com/nanobrowser/nanobrowser/blob/master/chrome-extension/src/background/agent/messages/views.ts
 *
 * Apache-2.0 License
 * Copyright (c) 2024 alexchenzl
 * https://github.com/nanobrowser/nanobrowser/blob/master/LICENSE
 */
import { type BaseMessage } from '@langchain/core/messages';
export interface MessageMetadata {
    inputTokens: number;
}
export interface ManagedMessage {
    message: BaseMessage;
    metadata: MessageMetadata;
}
export declare class MessageHistory {
    messages: ManagedMessage[];
    totalTokens: number;
    addMessage(message: BaseMessage, metadata?: MessageMetadata, position?: number): void;
    removeMessage(index?: number): void;
    /**
     * Removes the last message from the history if it is a human message.
     * This is used to remove the state message from the history.
     */
    removeLastHumanMessage(): void;
}
//# sourceMappingURL=views.d.ts.map