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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.
With the latest host directives API a whole new world of opportunities opens to Angular developers. From simple attribute directives composition to more complex scenarios. You can choose which part of your host directives API to keep private and which to expose behind custom names. Consider this example from the official documentation:
You can find the code of the UntilDestroy decorator by this link. All it does is patches the component's ngOnDestroy with unsubscription logic and call the original method at the end.