feat(nuxt): auto-register layers in layers/ directory

[danielroe]

🔗 Linked issue

follow up on #26444

📚 Description

This auto-registers layers located in a top-level ~~/layers directory. To avoid collisions with user layer configuration, it adds a new internal _extends key to nuxt options, and then instructs c12 to read from that. This seems like a more straightforward/correct way than attempting to add an auto-registration feature to c12 itself.

Would love your thoughts particularly @pi0 with regard to c12 approach.

[stackblitz]

Run & review this pull request in StackBlitz Codeflow.

[Atinux]

Seems good to me at first sight.

I would maybe named it _layers to be similar to the layers directory for consistency.

[pi0]

• This looks like a good approach in Nuxt to try
• I like the idea of _layers @Atinux mentioned it also marks it better for me as not-namespaced layers and might even eventually become standard for c12 and nitro

[danielroe]

._layers is already used internally for all resolved layers, so unfortunately I felt we had to avoid it.

It should be fine as we are not exposing this or even allowing users to provide their own config, so it's purely internal within this file.

[Rigo-m]

Will each layer have it's own tsconfig?

[Atinux]

._layers is already used internally for all resolved layers, so unfortunately I felt we had to avoid it.

It should be fine as we are not exposing this or even allowing users to provide their own config, so it's purely internal within this file.

Damn, then it's good for me!