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open-native
Open Native brings cross-platform communities together to help them collaborate and strengthen each other through development diversity.
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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.
I don't have personal experience with this, but React Native Web claims to solve this issue: https://necolas.github.io/react-native-web/, not sure if anyone has had experience with this. Of course, you will have issues with dependency hell/package maintenance.
Another great option seems to be Flutter web. I was really impressed by the "batteries included" approach to Flutter, and Dart has a pretty comprehensive standard library. This is in contrast to React's "just find a random package on npm and pray it doesn't bite you in the future."
Obviously rewrites are expensive, but I personally think both approaches are worth considering versus abandoning native components completely. WebView isn't without problems (and also, you don't need React Native to use WebView).
What they decided to do is really quite strange. Something like Capacitor makes much more sense but they said they wanted access to React Native libraries... I hope https://github.com/OpenNative/open-native can address their requirements in the future. It's goal is to make things like React Native native modules work across frameworks (e.g., react native libraries working in capacitor and native script)
heres the stuff that IS available in the expo sdk: https://docs.expo.dev/versions/v47.0.0
You then use 3rd party modules (or build your own) for anything else you need. For example, webtrc: https://github.com/react-native-webrtc/react-native-webrtc
The Telegram app is native: https://github.com/TelegramMessenger/Telegram-iOS