feat: add an option to not start a websocket server (#16219)

Author: sheremet-va

packages/vite/src/node/server/index.ts

@@ -101,6 +101,11 @@ export interface ServerOptions extends CommonServerOptions {
  * Configure HMR-specific options (port, host, path & protocol)
  */
 hmr?: HmrOptions|boolean
+/**
+ * Do not start the websocket connection.
+ * @experimental
+ */
+ws?: false
 /**
  * Warm-up files to transform and cache the results in advance. This improves the
  * initial page load during server starts and prevents transform waterfalls.

packages/vite/src/node/server/ws.ts

@@ -85,11 +85,31 @@ const wsServerEvents = [
 'message',
 ]
 
+functionnoop(){
+// noop
+}
+
 exportfunctioncreateWebSocketServer(
 server: HttpServer|null,
 config: ResolvedConfig,
 httpsOptions?: HttpsServerOptions,
 ): WebSocketServer{
+if(config.server.ws===false){
+return{
+name: 'ws',
+getclients(){
+returnnewSet<WebSocketClient>()
+},
+asyncclose(){
+// noop
+},
+on: noopasanyasWebSocketServer['on'],
+off: noopasanyasWebSocketServer['off'],
+listen: noop,
+send: noop,
+}
+}
+
 letwss: WebSocketServerRaw_
 letwsHttpServer: Server|undefined=undefined