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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, an open-source language developed and maintained by Microsoft, is a superset of JavaScript that adds static types to the language. It has grown to include such advanced features as generic types, conditional types, template literal types, tools for inferring types and mapped types, among others. While TypeScript's static typing system is a tremendous asset, it can sometimes be tricky to determine the type of an object at runtime, particularly when dealing with complex data structures or object-oriented programming constructs. This is where type guards come in.