React Native for Mac

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I'm using React Native to build a mobile App. Also I have a similar Mac App, I'm wondering if React Native can be adapted for Mac, how difficult it is.

React Native - doesn't support native OS X app, it is geared towards mobile native applications.

Even though it doesn't seem to be easy to adapt the code to run as a native OS X app, there is at least one project that is attempting to do that (the author of the project states that this was a weekend hack project and therefore not production ready, but nonetheless a good start point):

https://github.com/ptmt/react-native-desktop

Check out React Native for macOS, it appears to be what you are looking for: https://github.com/ptmt/react-native-macos

You may also consider Electron, however this is not a React-specific solution.

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