fix(server): handle file watcher errors without crashing

packages/vite/src/node/__tests__/plugins/hooks.spec.ts

@@ -7,6 +7,7 @@ import { type Logger, createLogger } from '../../logger'
 import type { Plugin } from '../../plugin'
 import { preview } from '../../preview'
 import { createServer } from '../../server'
+import { DevEnvironment } from '../../server/environment'
 
 const resolveConfigWithPlugin = (
   plugin: Plugin,
@@ -445,6 +446,32 @@ describe('watcher add/unlink error handling', () => {
     expect(logError).toHaveBeenCalled()
     expect(logError).toHaveBeenCalledWith(error)
   })
+
+  test("'error' event during environment initialization logs warning instead of crashing", async () => {
+    const error = Object.assign(new Error('watch failed'), { code: 'EBUSY' })
+
+    const logWarn = vi.fn()
+    const logger = createLogger('error')
+    logger.warn = logWarn
+
+    const init = DevEnvironment.prototype.init
+    const initSpy = vi
+      .spyOn(DevEnvironment.prototype, 'init')
+      .mockImplementation(function (options) {
+        const watcher = options?.watcher
+        if (this.name === 'client' && watcher) {
+          expect(() => watcher.emit('error', error)).not.toThrow()
+        }
+        return init.call(this, options)
+      })
+    onTestFinished(() => initSpy.mockRestore())
+
+    await createServerWithPlugin({ name: 'test' }, logger)
+
+    expect(logWarn).toHaveBeenCalledWith(
+      expect.stringContaining('file watcher error: watch failed'),
+    )
+  })
 })
 
 describe('closeServer hook', () => {

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

@@ -597,6 +597,10 @@ export async function _createServer(
       ) as FSWatcher)
     : createNoopWatcher(resolvedWatchOptions)
 
+  watcher.on('error', (error: Error) => {
+    config.logger.warn(colors.yellow(`file watcher error: ${error.message}`))
+  })
+
   const environments: Record<string, DevEnvironment> = {}
 
   await Promise.all(