import { t as HeadersRecord } from "./http-well-known-BK9MGKQf.js";
import { i as RetryOptions, t as EventEmitter } from "./emitter-yGbfYzOM.js";

//#region src/core/sse-client.d.ts

/**
 * Configuration for {@link SSEClient}.
 *
 * @example
 * const sse = new SSEClient({
 *   url: 'https://api.example.com/events',
 *   withCredentials: true,
 *   reconnect: { maxRetries: 5, initialDelayMs: 1000 },
 * });
 * sse.on('message', (e) => console.log(e.data));
 */
interface SSEConfig {
  /** The SSE endpoint URL. */
  url: string;
  /**
   * Whether to send cookies and auth headers with the EventSource request
   * (equivalent to `withCredentials` on `XMLHttpRequest`).
   * @default false
   */
  withCredentials?: boolean;
  /**
   * Automatic reconnect behaviour when the stream closes unexpectedly.
   * Pass `true` for defaults (5 retries, exponential back-off) or a
   * `RetryOptions` object to customise.
   * @default false
   */
  reconnect?: boolean | RetryOptions;
  /**
   * Additional request headers.
   *
   * **Note:** The native browser `EventSource` API does not support custom
   * headers. This field is forwarded only when a fetch-based SSE polyfill
   * is in use. Common header names are suggested by IntelliSense.
   *
   * @example
   * headers: { Authorization: 'Bearer <token>' }
   */
  headers?: HeadersRecord;
}
type SSEEvents = {
  open: [Event];
  error: [Event];
  message: [MessageEvent];
  reconnect: [number];
  'reconnect:fail': [Error];
  [key: string]: unknown[];
};
declare class SSEClient extends EventEmitter<SSEEvents> {
  private config;
  private eventSource;
  private reconnectAttempts;
  private isExplicitlyClosed;
  constructor(config: SSEConfig);
  connect(): void;
  close(): void;
  /**
   * Add a listener for a specific event type
   */
  addEventListener(type: string, listener: (event: MessageEvent) => void): void;
  /**
   * Remove a listener for a specific event type
   */
  removeEventListener(type: string, listener: (event: MessageEvent) => void): void;
  private setupListeners;
  private handleReconnect;
  private handleConnectionError;
}
//#endregion
export { SSEConfig as n, SSEEvents as r, SSEClient as t };
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