Document middleware.js

[petermikitsh]

Is your feature request related to a problem? Please describe

Stack overflow, Google, etc. discuss a "middleware.js" file but I can't find anything official on the Storybook site.

It seems like something I'm interested in using, but I'm unsure if it's considered a stable part of the public interface, if it is subject to breaking changes without semver update, etc.

Describe the solution you'd like

Clarified expectations around the usage of middleware.js.

Describe alternatives you've considered

N/A

Are you able to assist to bring the feature to reality?

I don't know the status of the feature to properly document it.

Additional context
Add any other context or screenshots about the feature request here.

[petermikitsh]

Looking through more issues, #208 (comment) from @shilman sets expectations for middleware.js.

[shilman]

Hey @petermikitsh -- yeah that comment is pretty much still valid. middleware.js is an intentionally undocumented API that we are not promoting. That said, the APIs haven't changed in years and are still working and used by a bunch of different projects so ... if it seems to fit your use case YMMV.

[petermikitsh]

Thanks for the update on the status of middleware.js! Closing for now.