/**
 * Enhanced server types for SSE client and LLM service
 */
import { ChatRequestParams } from '../type';
export declare enum SSEConnectionState {
    DISCONNECTED = "disconnected",
    CONNECTING = "connecting",
    CONNECTED = "connected",
    RECONNECTING = "reconnecting",
    CLOSING = "closing",
    CLOSED = "closed",
    ERROR = "error"
}
export interface SSEClientConfig extends Omit<RequestInit & ChatRequestParams, 'signal'> {
    timeout?: number;
}
export interface SSEEvent {
    event?: string;
    data?: any;
    id?: string;
    retry?: number;
    timestamp?: number;
}
export interface ConnectionInfo {
    id: string;
    retryCount: number;
    lastActivity: number;
    state?: SSEConnectionState;
    url?: string;
    createdAt?: number;
    error?: Error;
    stats: ConnectionStats;
}
export interface ConnectionStatus {
    id: string;
    state: SSEConnectionState;
    error?: Error;
    lastActivity?: number;
}
export interface ConnectionStats {
    lastError?: Error;
    connectionTime?: number;
}
export interface StateChangeEvent {
    connectionId: string;
    from: SSEConnectionState;
    to: SSEConnectionState;
    timestamp: number;
}
export interface HeartbeatEvent {
    connectionId: string;
    timestamp: number;
}
export declare const DEFAULT_SSE_CONFIG: SSEClientConfig;