/**
 * asyncSSE yields events when streaming from an SSE endpoint.
 *
 * @param {string | Request} request - The URL or Request object for the SSE endpoint.
 * @param {RequestInit} options - Optional RequestInit object to configure the fetch request.
 * @param {SSEConfig} config - Optional configuration object for the SSE stream.
 * @returns {AsyncGenerator<SSEEvent, void, unknown>} An AsyncGenerator that yields SSEEvent objects.
 *
 * @example
 * for await (const event of asyncSSE("https://example.com/stream", { method: "POST" })) {
 *   console.log(event);
 * }
 */
export declare function asyncSSE(request: string | Request, options?: RequestInit, config?: SSEConfig): AsyncGenerator<SSEEvent, void, unknown>;
/**
 * Represents an event object returned by the SSE stream.
 * This interface allows for any string key-value pairs, with some common SSE fields explicitly defined.
 */
export interface SSEEvent {
    data?: string;
    event?: string;
    error?: string;
    [key: string]: string | undefined;
}
/**
 * Configuration options for the SSE stream
 */
export interface SSEConfig {
    /** Custom fetch implementation. Defaults to global fetch if not provided. */
    fetch?: typeof fetch;
    /** Callback function called with the Response object after successful fetch */
    onResponse?: (response: Response) => any;
}