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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
I opened a random file in the ReactJs code base, and they actually do this a lot, e.g. here, here or here. Is this easy to read? I don't know, but the comments describe very well WHY something is happening, not only WHAT is happening, so I'd rather have this information as comments in code than not having it at all.
The good news is: Not all is lost. The messages are still there if you take a look at the commits of the PR. It's just a little harder to backtrack. Here is one example of a commit I made that has tons of information (even with a link!) that got squashed away.