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styled-components
Visual primitives for the component age. Use the best bits of ES6 and CSS to style your apps without stress 💅
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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'm not sure if this is a response to my comment about styled-components. If so, styled-components is something specific. https://styled-components.com/ (Emotions library also has this as an option too). It's not just a wrapper. And you wouldn't be able to use it in conjunction with bootstrap classes unless you took additional steps in the setup. But nevermind about this. It's not necessary, I was just taking a guess as to what code you were referring to.