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We can also use onMount to make a store that tells you whether a component has finished mounting or not. This code is from the svelte-mount package:
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I haven't quite wrapped my mind around it, but you can even use afterUpdate in Svelte to replicate React's useEffect hook. See this example from Rich Harris, which I found in an interesting GitHub issue discussing the edges of Svelte's reactivity.
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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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I simplified my implementation of this for the above example, but you can find the original code on GitHub.
