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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.
Nice! This reminds me a lot of cva, seems interesting!
It is a lot like that! I just found this one as well: https://github.com/crswll/clb. The main difference is Hyclass just parses the options from the provided className string, while those you pass in the object options themselves. Those are definitely more powerful for things like toggling a style on and off, but I think Hyclass is more succinct and readable for simply aliasing away messy classes.