/// <reference types="react" />
export interface EventSourceOptions {
  init?: EventSourceInit;
  event?: string;
}
export type EventSourceMap = Map<
  string,
  {
    count: number;
    source: EventSource;
  }
>;
export declare const EventSourceProvider: import("react").Provider<EventSourceMap>;
/**
 * Subscribe to an event source and return the latest event.
 * @param url The URL of the event source to connect to
 * @param options The options to pass to the EventSource constructor
 * @returns The last event received from the server
 */
export declare function useEventSource(
  url: string | URL,
  { event, init }?: EventSourceOptions
): string | null;