import { Message } from "../chat/Message.js";
import { ChatResponseString } from "../chat/ChatResponse.js";
/**
 * Interceptor for processing messages before they are sent to the LLM.
 * Return modified messages or void to keep original.
 */
export type RequestInterceptor = (messages: Message[]) => Promise<Message[] | void> | Message[] | void;
/**
 * Interceptor for processing LLM responses before they are returned to the user.
 * Return modified response or void to keep original.
 */
export type ResponseInterceptor = (response: ChatResponseString) => Promise<ChatResponseString | void> | ChatResponseString | void;
/**
 * Manages a chain of interceptors that can modify requests and responses.
 */
export declare class InterceptorChain {
    private requestInterceptors;
    private responseInterceptors;
    /**
     * Add a request interceptor to the chain.
     */
    addRequestInterceptor(interceptor: RequestInterceptor): this;
    /**
     * Add a response interceptor to the chain.
     */
    addResponseInterceptor(interceptor: ResponseInterceptor): this;
    /**
     * Execute all request interceptors in order.
     */
    executeRequestInterceptors(messages: Message[]): Promise<Message[]>;
    /**
     * Execute all response interceptors in order.
     */
    executeResponseInterceptors(response: ChatResponseString): Promise<ChatResponseString>;
    /**
     * Clear all interceptors.
     */
    clear(): void;
    /**
     * Get the number of registered interceptors.
     */
    get size(): {
        request: number;
        response: number;
    };
}
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