Fix exports field for stimulus package and Webpack 5

[glaszig]

without "." defined as export, webpack 5 won't find the requested module (didn't check with other webpack versions).
this happens because the exports field replaces the root-level "module", "main", "types", etc:

When the exports field is specified, only these module requests are available. Any other requests will lead to a ModuleNotFound Error.

see https://webpack.js.org/guides/package-exports/

this fixes the following error for me:

ERROR in ./app/javascript/packs/application.js 2:0-33
Module not found: Error: Package path . is not exported from package ./node_modules/stimulus (see exports field in ./node_modules/stimulus/package.json)

also, 3.0.1 does not exibit the issue. i guess this issue was introduced with #468.

[chrisgrande]

I had this issue as well, I just had to change my imports from stimulus to @hotwired/stimulus to fix the resolution.

[marcoroth]

Hey @glaszig! Thank you for opening this!

You are right, my bad! We'll get this resolved with the next version.

Thank you!

[marcoroth]

I'm actually surprised that it doesn't complain about the @hotwired/stimulus package. If you look at it's package.json it also doesn't explicitly set the exports.. field.

The only reason why it probably doesn't work in the stimulus case is because we are setting the exports field and thus overriding the default.

In the meantime, you can resolve the issue by using the @hotwired/stimulus package as @chrisgrande mentioned or make an alias for your stimulus package in the package.json like so if you don't want to update all the references throughout your app:

  "stimulus": "npm:@hotwired/stimulus"