SvelteKit alternative hooks path resolving problem

[p4wn-dev]

Describe the bug

I have defined an alternative path for my server hook file in svelte.config.js, which is

[....]
files: { hooks: { server: 'src/hooks/hooks.server' } }
[....]

Since updating SvelteKit this does not work anymore and I get an internal server error. I provided the stack trace.
After tinkering around I found that if you create an empty universal hook file and add it to svelte.config.js like this:

files: { hooks: { server: 'src/hooks/hooks.server', universal: 'src/hooks/hooks' } }

Then it works.
Strangely adding a client hooks file does not work, only with a universal hooks file.

Did something change recently that I missed? I could not find anything related to this.

Reproduction

https://stackblitz.com/edit/sveltejs-kit-template-default-llqwvuwy

Logs

Error: Failed to load url /src/hooks (resolved id: /src/hooks). Does the file exist?
    at loadAndTransform (file:///<project_path>/node_modules/vite/dist/node/chunks/dep-yUJfKD1i.js:40842:17) {
  code: 'ERR_LOAD_URL',
  runnerError: Error: RunnerError
      at reviveInvokeError (file:///<project_path>/node_modules/vite/dist/node/module-runner.js:545:18)
      at Object.invoke (file:///<project_path>/node_modules/vite/dist/node/module-runner.js:628:15)
      at async SSRCompatModuleRunner.getModuleInformation (file:///<project_path>/node_modules/vite/dist/node/module-runner.js:1200:73)
      at async request (file:///<project_path>/node_modules/vite/dist/node/module-runner.js:1222:88)
      at async get_hooks (<project_path>/.svelte-kit/generated/server/internal.js:44:28)
      at async eval (<project_path>/node_modules/@sveltejs/kit/src/runtime/server/index.js:82:20)
      at async Server.init (<project_path>/node_modules/@sveltejs/kit/src/runtime/server/index.js:80:3)
      at async file:///<project_path>/node_modules/@sveltejs/kit/src/exports/vite/dev/index.js:489:5

System Info

System:
    OS: Windows 10 10.0.19045
    CPU: (8) x64 Intel(R) Xeon(R) W-2225 CPU @ 4.10GHz
    Memory: 10.87 GB / 31.69 GB
  Binaries:
    Node: 22.6.0
    npm: 10.9.2
  Browsers:
    Edge: Chromium (131.0.2903.99)
  npmPackages:
    @sveltejs/adapter-auto: ^3.0.0 => 3.3.1
    @sveltejs/adapter-node: ^5.2.9 => 5.2.10
    @sveltejs/kit: ^2.9.0 => 2.12.1
    @sveltejs/vite-plugin-svelte: ^5.0.0 => 5.0.2
    svelte: ^5.0.0 => 5.14.1
    vite: ^6.0.0 => 6.0.3

Severity

annoyance

Additional Information

UPDATE: Can confirm that the issue occurs from version 2.11.0 upwards.

No response

[paoloricciuti]

I think this might be related to #13144

cc @eltigerchino