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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.
TypeScript's type system has no way to encode the functions that can be thrown from a piece of code into a meaningful type representation, at least as of now. This means that the compiler cannot indicate that the programmer should prepare for an error being thrown and handle it accordingly.
Those familiar with more functional languages might be screaming about monads at their screens now. Indeed, if we want to go a step further than using discriminated unions, we can apply Either monads. Those come with a whole lot of useful tooling with them, like the possibility of monadic pattern matching and chaining operations. We have good experiences of using fp-ts in my team at Swappie, and even thought the initial learning curve can be steep, the benefits are useful. You can read more about monads in various blog posts all over the web, this one being a good example of Either specifically.