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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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namespace.style
A zero-dependency CSS class composer, bringing structure + types to the intersection between HTML + CSS.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Shiki (https://shiki.style) might be good enough for your usecase, use the latest beta versions as it's the new fresh esm rewrite.
Vue with Vite (the builder/runner) is a stable, open source option. It is really a lightweight start where you're mostly writing HTML with interpolated data, and Vue is updating values correctly and performantly. Just build your reactive HTML app in one file and break into separate components as you're feeling the spirit. https://vuejs.org/guide/quick-start
Mithril if you just want to drop in want a tiny, complete reactive library that doesn't require a build step--this one is most like what you might end up creating in a large jQuery app. You can understand everything from the homepage. https://mithril.js.org/
HTMX if you really like HTML conventions. This doesn't feel jQuery-like and depends on your approach to your server app. https://htmx.org/
Vue with Vite (the builder/runner) is a stable, open source option. It is really a lightweight start where you're mostly writing HTML with interpolated data, and Vue is updating values correctly and performantly. Just build your reactive HTML app in one file and break into separate components as you're feeling the spirit. https://vuejs.org/guide/quick-start
Mithril if you just want to drop in want a tiny, complete reactive library that doesn't require a build step--this one is most like what you might end up creating in a large jQuery app. You can understand everything from the homepage. https://mithril.js.org/
HTMX if you really like HTML conventions. This doesn't feel jQuery-like and depends on your approach to your server app. https://htmx.org/
CSS-in-JS has been a challenge – we're currently using https://github.com/astroturfcss/astroturf which seemed the simplest zero-runtime-cost option back when we were looking, but the library is starting to feel a bit under-maintained (if the author of Astroturf reads this, we love your work and will do whatever we can to support you in it!). But it's worked well for us over the last 2 years.
Happy to share a component example. We also use a small library for managing CSS classes in a typed fashion, which can also be used by our UI test code to target various elements. So that does add a bit of cryptic boilerplate, but the repo README has an example component with syntax highlighting: