feat: allow disabling ws server completely if hmr: false

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

@@ -16,7 +16,11 @@ import {
   PluginContainer
 } from '../server/pluginContainer'
 import { FSWatcher, WatchOptions } from 'types/chokidar'
-import { createWebSocketServer, WebSocketServer } from '../server/ws'
+import {
+  createMockWebSocketServer,
+  createWebSocketServer,
+  WebSocketServer
+} from '../server/ws'
 import { baseMiddleware } from './middlewares/base'
 import { proxyMiddleware, ProxyOptions } from './middlewares/proxy'
 import { transformMiddleware } from './middlewares/transform'
@@ -269,7 +273,10 @@ export async function createServer(
   const httpServer = middlewareMode
     ? null
     : await resolveHttpServer(serverConfig, middlewares)
-  const ws = createWebSocketServer(httpServer, config)
+  const ws =
+    config.server.hmr === false
+      ? createMockWebSocketServer(httpServer, config)
+      : createWebSocketServer(httpServer, config)
 
   const { ignored = [], ...watchOptions } = serverConfig.watch || {}
   const watcher = chokidar.watch(path.resolve(root), {

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

@@ -86,3 +86,27 @@ export function createWebSocketServer(
     }
   }
 }
+
+export function createMockWebSocketServer(
+  _server: Server | null,
+  config: ResolvedConfig
+) {
+  return {
+    send(payload: HMRPayload) {
+      if (payload.type === 'error') {
+        config.logger.info(
+          chalk.red(`WebSocket server [mock] error:\n${payload.err.message}`)
+        )
+      } else {
+        const formattedPayload = JSON.stringify(payload, undefined, 2)
+        config.logger.info(
+          chalk.dim(`WebSocket server [mock] payload:\n${formattedPayload}`)
+        )
+      }
+    },
+
+    close() {
+      return Promise.resolve()
+    }
+  }
+}