ERR_CONNECTION_REFUSED In a large application in dev mode

[Flashantik]

Environment

---

• Operating System: Darwin
• Node Version: v18.19.0
• Nuxt Version: 3.10.0
• CLI Version: 3.10.0
• Nitro Version: 2.8.1
• Package Manager: npm@10.2.3
• Builder: -
• User Config: srcDir, devtools
• Runtime Modules: -
• Build Modules: -

---

Reproduction

https://github.com/Flashantik/nuxt-3.10.-slow-dev-mode

Describe the bug

We have a large application, however after updating nuxt@3.7 dev mode started to slow down a lot and often cannot render all components
I was able to recreate this behavior in a clean project with a lot of simple components...

To get the error all you need to do is run npm run dev and go to localhost:3000.
Many components in the network will be in pending mode and after some time 500 error or ERR_CONNECTION_REFUSED error will be displayed. If there is no error in the console it is enough to reload the page.

build mode works fine. If you install nuxt@3.6.5 there are no such problems with dev mode.

Additional context

No response

Logs

Client logs: 

vue-router.mjs:3471 TypeError: Failed to fetch dynamically imported module: http://localhost:3000/_nuxt/pages/index.vue
triggerError @ vue-router.mjs:3471
(anonymous) @ vue-router.mjs:3184
nuxt.js:98 [nuxt] error caught during app initial
[Vue Router warn]: uncaught error during route navigation:

[nuxt] error caught during app initialization TypeError: Failed to fetch dynamically imported module

Failed to load resource: net::ERR_CONNECTION_REFUSED
Failed to load resource: net::ERR_SOCKET_NOT_CONNECTED
Hydration class mismatch

Server Logs (sometimes) 

ERROR  [unhandledRejection] connect ETIMEDOUT 127.0.0.1:61574                                                   9:49:52 PM

  at TCPConnectWrap.afterConnect [as oncomplete] (node:net:1595:16)

[ThomasBerneHCSE]

Same problem occurs on nuxt 3.11.1 with nitropack 2.9.X

[Flashantik]

Same problem occurs on nuxt 3.11.1 with nitropack 2.8.X

Yes, but it's hardly a nitropack problem. nuxt@3.6.5 works fine with nitropack@2.8.1, but nuxt@3.7.0 with nitropack@2.8.1 is already slow and buggy. This continues on nuxt@3.11.1.

[joaomarcelofm]

This is happening in our project that isn't that big even (±400 components). It does indeed seem to be mainly a Nuxt issue, as @Flashantik pointed out in nuxt/nuxt#23832.

[Flashantik]

This is happening in our project that isn't that big even (±400 components). It does indeed seem to be mainly a Nuxt issue, as @Flashantik pointed out in nuxt/nuxt#23832.

It's not just about the components, but also about composables, utils pages, and so on. Each file in dev mode is loaded separately on the network, I think this is the problem..

By the way, as a solution to the problem, I found using bun instead of node, it is capable of consistently delivering about 10,000 files

[robinscholz]

Facing the same problem!

[flakerimi]

Same here,loses connection with reka ui, but after some times it works again untill I refactor imports.
Like when I move / rename a component it happens. Still not sure how to reproduce or fix.

[danielroe]

I was not able to reproduce with your original repo