import { EventSource } from 'eventsource';
type SSEHandlers = {
    sid?: string;
    onOpen?: (es: EventSource) => void;
    onMessage?: (data: unknown, ev: MessageEvent<string>) => void;
    onError?: (err: Event | Error) => void;
    events?: Record<string, (data: unknown, ev: MessageEvent<string>) => void>;
};
type SSEOptions = SSEHandlers & {
    enabled?: boolean;
    withCredentials?: boolean;
    params?: Record<string, string | number | boolean | undefined>;
    headers?: Record<string, string>;
    parse?: (raw: string) => unknown;
    retryBaseDelay?: number;
    retryMaxDelay?: number;
};
type ReadyState = 'CONNECTING' | 'OPEN' | 'CLOSED';
export declare function useSSE(url: string, { sid, enabled, withCredentials, params, headers, parse, onOpen, onMessage, onError, events, retryBaseDelay, retryMaxDelay, }?: SSEOptions): {
    readyState: ReadyState;
    isConnected: boolean;
    lastEvent: unknown;
    error: unknown;
    connect: () => void;
    disconnect: () => void;
};
export {};