🐛 [Bug] v5.1.1 - Can't load the middleware.

[JakiChen]

Astro Info

Astro                    v5.1.1
Node                     v20.18.0
System                   macOS (x64)
Package Manager          yarn
Output                   server
Adapter                  @astrojs/vercel
Integrations             astro-favicons
                         @storyblok/astro
                         astro-robots
                         @astrojs/sitemap

If this issue only occurs in one browser, which browser is a problem?

No response

Describe the Bug

The issue occurs when astro-favicons are a development dependency, but as a dependency, everything works fine.

What causes this?

What's the expected result?

The middleware of astro-favicons should work fine regardless of whether it is a development dependency or a dependency Because in "astro": "^4.16.14", complex projects (useful to middleware, restApi, storyblok, etc.) will work fine

Link to Minimal Reproducible Example

See https://github.com/jakichen/boilerplates-vercel

Participation

• I am willing to submit a pull request for this issue.

[github-actions]

Hello @JakiChen. Please provide a minimal reproduction using a GitHub repository or StackBlitz. Issues marked with needs repro will be closed if they have no activity within 3 days.

[dreamstar-enterprises]

I have the same issue following this example:
https://docs.astro.build/en/guides/middleware/
Middleware just wont load in 5.1.1

{
  "name": "Error",
  "code": "ERR_MODULE_NOT_FOUND",
  "runnerError": {}
}

Also your docs have errors I believe (no context in the return statement before locals):

export function onRequest (context, next) {
    // intercept data from a request
    // optionally, modify the properties in `locals`
    context.locals.user.name = "John Wick";
    context.locals.welcomeTitle = () => {
        return "Welcome back " + locals.user.name;
    };

    // return a Response or the result of calling `next()`
    return next();
};