/**
 * Chat Service
 *
 * Handles API interactions for the LLM Chat feature including
 * sending messages, retrieving history, and clearing history.
 *
 * @module services/chatService
 */
import type { ChatRequest, ChatResponse, ChatHistoryMessage } from '../types/chat.js';
/**
 * Chat Service class
 *
 * Provides methods to interact with the chat API endpoints
 * for LLM-powered workflow building assistance.
 */
export declare class ChatService {
    private static instance;
    private constructor();
    /**
     * Get the singleton instance of ChatService
     *
     * @returns The ChatService singleton instance
     */
    static getInstance(): ChatService;
    /**
     * Get the endpoint configuration
     *
     * @throws Error if endpoint configuration is not set
     * @returns The endpoint configuration
     */
    private getConfig;
    /**
     * Generic API request helper
     *
     * @param url - The URL to fetch
     * @param options - Fetch options
     * @returns The parsed JSON response
     */
    private request;
    /**
     * Send a message to the chat endpoint
     *
     * @param workflowId - The workflow ID
     * @param request - The chat request payload
     * @returns The chat response from the LLM
     */
    sendMessage(workflowId: string, request: ChatRequest): Promise<ChatResponse>;
    /**
     * Get conversation history for a workflow
     *
     * @param workflowId - The workflow ID
     * @returns Array of chat history messages
     */
    getHistory(workflowId: string): Promise<ChatHistoryMessage[]>;
    /**
     * Clear conversation history for a workflow
     *
     * @param workflowId - The workflow ID
     */
    clearHistory(workflowId: string): Promise<void>;
}
/**
 * Pre-instantiated ChatService singleton
 */
export declare const chatService: ChatService;