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react-spectrum
A collection of libraries and tools that help you build adaptive, accessible, and robust user experiences.
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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.
Their repos are public: - https://github.com/adobe/spectrum-web-components - https://github.com/adobe/react-spectrum
Their repos are public: - https://github.com/adobe/spectrum-web-components - https://github.com/adobe/react-spectrum
You definitely don't need a library for any simple design system component. But yes, JS would be required for things like modals/dialogs as far as I'm aware. Would be nice if they added a way to handle that without JS considering how popular of a component it is (related thread). I would have to know the entire overall setup of your component library and stack to have any recommendation for handling these JS dependent components though.