Error 503 on windows

[NicolaSpadari]

Describe the bug

I'm trying to start a basic barebone project with nuxt-server-fn, and while I know it's still wip, trying to create a simple function like the one in the examples hello.ts just crashes the server.
The error it shows is:

Error [ERR_UNSUPPORTED_ESM_URL_SCHEME]: Only URLs with a scheme in: file, data are supported by the default ESM loader. On Windows, absolute paths must be valid file:// URLs. Received protocol 'c:'
    at new NodeError (node:internal/errors:372:5)
    at throwIfUnsupportedURLScheme (node:internal/modules/esm/resolve:1068:11)
    at defaultResolve (node:internal/modules/esm/resolve:1148:3)
    at ESMLoader.resolve (node:internal/modules/esm/loader:536:30)
    at ESMLoader.getModuleJob (node:internal/modules/esm/loader:250:18)
    at ModuleWrap. (node:internal/modules/esm/module_job:79:40)
    at link (node:internal/modules/esm/module_job:78:36)

Using the latest "nuxt": "3.0.0-rc.5", Node 17.6.0, almost no other dependencies, empty project.
If I remove nuxt-server-fn from the nuxt.config.ts module section, it starts correctly.

Reproduction

A regular install and run of a project

System Info

System:
  OS: Windows 10 10.0.22000
  CPU: (8) x64 Intel(R) Core(TM) i7-9700K CPU @ 3.60GHz
  Memory: 23.12 GB / 31.92 GB
Binaries:
  Node: 17.6.0 - c:\program files\nodejs\node.EXE
  Yarn: 1.22.19 - c:\program files\nodejs\yarn.CMD
  npm: 8.5.1 - c:\program files\nodejs\npm.CMD
Browsers:
  Edge: Spartan (44.22000.120.0), Chromium (103.0.1264.49)
  Internet Explorer: 11.0.22000.120

Used Package Manager

npm

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