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/// <reference types="node" />
/// <reference types="node" />
/// <reference types="node" />
import { MessageEvent } from '@nestjs/common/interfaces';
import { IncomingMessage, OutgoingHttpHeaders } from 'http';
import { Transform } from 'stream';
export type AdditionalHeaders = Record<string, string[] | string | number | undefined>;
interface ReadHeaders {
getHeaders?(): AdditionalHeaders;
}
interface WriteHeaders {
writableEnded?: boolean;
writeHead?(statusCode: number, reasonPhrase?: string, headers?: OutgoingHttpHeaders): void;
writeHead?(statusCode: number, headers?: OutgoingHttpHeaders): void;
flushHeaders?(): void;
}
export type WritableHeaderStream = NodeJS.WritableStream & WriteHeaders;
export type HeaderStream = WritableHeaderStream & ReadHeaders;
/**
* Adapted from https://raw.githubusercontent.com/EventSource/node-ssestream
* Transforms "messages" to W3C event stream content.
* See https://html.spec.whatwg.org/multipage/server-sent-events.html
* A message is an object with one or more of the following properties:
* - data (String or object, which gets turned into JSON)
* - type
* - id
* - retry
*
* If constructed with a HTTP Request, it will optimise the socket for streaming.
* If this stream is piped to an HTTP Response, it will set appropriate headers.
*/
export declare class SseStream extends Transform {
private lastEventId;
constructor(req?: IncomingMessage);
pipe<T extends WritableHeaderStream>(destination: T, options?: {
additionalHeaders?: AdditionalHeaders;
end?: boolean;
}): T;
_transform(message: MessageEvent, encoding: string, callback: (error?: Error | null, data?: any) => void): void;
/**
* Calls `.write` but handles the drain if needed
*/
writeMessage(message: MessageEvent, cb: (error: Error | null | undefined) => void): void;
}
export {};