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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.
https://github.com/Microsoft/TypeScript/wiki/FAQ#why-are-functions-with-fewer-parameters-assignable-to-functions-that-take-more-parameters
I'm a fan of types, but not a fan of TypeScript (reasons for that in the article). TypeScript's type system is overcomplicated to the point where some people implemented a SQL database entirely in type annotations. Basing a new language on a broken one, hoping that it'll fix the quirks, will result in a broken language.