Feedback for “Class”

I'm trying to use napi-rs at the moment for a project and I'm generally very impressed and grateful for what you have created.

Yesterday I had the experience of getting quite confused about an error which said

the trait NapiValue is not implemented for MyValue

And I couldn't see anything about MyValue that would be causing the problem given how I was setting it up. It turned out that I had another struct with #[napi] which had a pub value: MyValue field and it was the pub that was triggering the error. It never should have been pub but I guess I typed it accidentally at some point. I realise it is hard to control the kind of errors that the compiler produces in this situation but I'm wondering if the docs could be extended to include a section about pub fields and their implications and the kind of error that I ran into.

I would be happy to try to provide some text or a PR if that would be useful.

Locate the documentation section for “Class” and review how fields are currently explained. Add guidance about pub fields, their implications, and the NapiValue error described in the issue; done means a reader can understand why an accidental pub field causes this error.