import type { EventSourceMessage } from './parse';
export declare const EventStreamContentType = "text/event-stream";
export interface FetchEventSourceInit extends RequestInit {
    /**
     * The request headers. FetchEventSource only supports the Record<string,string> format.
     */
    headers?: Record<string, string>;
    /**
     * Called when a response is received. Use this to validate that the response
     * actually matches what you expect (and throw if it doesn't.) If not provided,
     * will default to a basic validation to ensure the content-type is text/event-stream.
     */
    onopen?: (response: Response) => Promise<void>;
    /**
     * Called when a message is received. NOTE: Unlike the default browser
     * EventSource.onmessage, this callback is called for _all_ events,
     * even ones with a custom `event` field.
     */
    onmessage?: (ev: EventSourceMessage) => void;
    /**
     * Called when a response finishes. If you don't expect the server to kill
     * the connection, you can throw an exception here and retry using onerror.
     */
    onclose?: () => void;
    /**
     * Called when there is any error making the request / processing messages /
     * handling callbacks etc. Use this to control the retry strategy: if the
     * error is fatal, rethrow the error inside the callback to stop the entire
     * operation. Otherwise, you can return an interval (in milliseconds) after
     * which the request will automatically retry (with the last-event-id).
     * If this callback is not specified, or it returns undefined, fetchEventSource
     * will treat every error as retriable and will try again after 1 second.
     */
    onerror?: (err: any) => number | null | undefined | void;
    /** The Fetch function to use. Defaults to window.fetch */
    fetch?: typeof fetch;
    /** 出错时自动重试次数，默认0 */
    autoRetryTime?: number;
    /** 超时时间，单位毫秒，默认60*1000 */
    timeout?: number;
    /** 是否debug模式，debug模式时会输出跟多详细日志 */
    debug?: boolean;
}
/**
 * sse请求
 */
export default function requestSse(input: RequestInfo, { signal: inputSignal, headers: inputHeaders, onopen: inputOnOpen, onmessage, onclose, onerror, fetch: inputFetch, autoRetryTime, timeout, debug, ...rest }: FetchEventSourceInit): Promise<void>;