/**
 * Streams server-sent events from the given URL
 *
 * @param url - The URL to stream events from
 * @param options - The options for the SSE stream
 * @param options.onMessage - The function to call when a message is received
 * @param options.onError - The function to call when an error occurs
 * @param options.onClose - The function to call when the stream finishes successfully
 * @param options.fetchFn - The function to use to fetch the events. Consumers need to provide a fetch function that supports server-sent events.
 */
export declare const fetchServerEvents: (url: string, { onMessage, onError, onClose, fetchFn, ...requestOptions }: RequestInit & {
    onMessage: (data: Record<string, unknown>, eventName?: string) => Promise<void>;
    onError?: ((err: unknown) => void) | undefined;
    onClose?: (() => void | Promise<void>) | undefined;
    fetchFn: typeof fetch;
}) => Promise<void>;
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