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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.
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working example on github
As I've been writing this series, I realized it's an ode to the magic of Testing Library, which is built for testing UIs as a user would experience an app. This principle means Testing Library is not introduced to your UI until after it has already rendered...which means Testing Library is navigating a DOM just as a user would...and users do not know or care what framework you used to build your UI, just that it works as expected.
This article shows a set of shared-tests for testing a Counter component rewritten across multiple Javascript frameworks. We'll be using the components found in the Astro Web Framework's example: Kitchen Sink (Multiple Frameworks). These are written in Preact, React, Svelte, SolidJS, and Vue. This Astro microfrontend example is fantastic in that it demonstrates how the Astro Web Framework can have multiple Javascript frameworks running on the same page at the same time.