import { RequestMethod } from '../../enums/request-method.enum.js';
/**
 * Interface defining options that can be passed to `@Sse()` decorator
 *
 * @publicApi
 */
export interface SseOptions {
    /**
     * HTTP request method of the route (default: `RequestMethod.GET`).
     */
    method?: RequestMethod;
    /**
     * Maximum number of characters of event data (`data` plus `comment`) that
     * may wait for a client that is not reading its events (default:
     * 4 * 1024 * 1024, i.e. 4M characters). Events wait once the stream and
     * socket buffers are full, as the producer cannot be paused. Past this
     * limit, the connection is dropped as if the client had disconnected, and
     * a warning is logged. Set to 0 or `Infinity` to disable.
     */
    maxPendingDataLength?: number;
}
/**
 * Declares this route as a Server-Sent-Events endpoint
 *
 * Events wait in memory for a client that is not reading them. Once more than
 * `maxPendingDataLength` characters of event data (4M by default) wait for a
 * client whose stream is backed up, its connection is dropped. An
 * `EventSource` then reconnects, sending the id of the last event it received.
 * Raise the limit for a route that streams bulk data faster than its clients
 * read, or set it to 0 or `Infinity` to lift it.
 *
 * @param path route path (default: `/`)
 * @param options `SseOptions` object specifying:
 * - `method` - HTTP request method of the route (default: `GET`).
 * - `maxPendingDataLength` - maximum number of characters of event data that
 * may wait for a client that is not reading them (default: 4M). 0 or
 * `Infinity` lifts the limit.
 *
 * @example
 * ```ts
 * @Sse('logs', { maxPendingDataLength: 64 * 1024 * 1024 })
 * logs(): Observable<MessageEvent> { ... }
 * ```
 *
 * @publicApi
 */
export declare function Sse(path?: string, options?: SseOptions): MethodDecorator;