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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.
None of these are supported natively by JavaScript. Macros and ifdefs you could get with your own build step using things like sweetjs or ifdef-loader for webpack. Enums are in a similar boat with TypeScript supporting enums out of the box. But there's also a (very early) proposal to add enums natively to JavaScript as well.
None of these are supported natively by JavaScript. Macros and ifdefs you could get with your own build step using things like sweetjs or ifdef-loader for webpack. Enums are in a similar boat with TypeScript supporting enums out of the box. But there's also a (very early) proposal to add enums natively to JavaScript as well.