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Demo of Fable with React Native for cross platform native mobile apps

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Fable on React Native demo

This is a demo application for React Native development in F# using Fable.

If you want to try it out then please do the following:

Make sure FSharp is installed

Make sure that the FSharp compiler is properly installed on your operating system:

Make sure React Native works

Running F# code on React Native

  • Pull latest master
  • Run "npm install" from command prompt
  • Open Android Simulator
  • Open VS Code
  • Press F5 to start debug
  • Go to android device simulator and you should see something like

Device Running

  • Go to VS Code and hit Ctrl+Shift+B this will activate fable watch
  • Go to the F# source in VS Code make a change and save the file
  • Fable watch should pick up this change automatically and compile it
  • Go to android device simulator and press r+r - change should be visible

This could look like:

Hot loading

Error handling

Unauthorized device

If you hit F5 in VS Code and it compiles everything, but nothing happens... go to the debugger output (Ctrl+Shif+y) and search for hints. One pitfall might be "Skipping device, Device is UNAUTHORIZED". With

adb devices

you can see the list of devices, probably one of them is marked as UNAUTHORIZED. First, try

adb kill-server

and try it again. If it doesn't help, you can push the public key onto the device again:

cd ~/.android && adb push adbkey.pub /data/misc/adb/adb_keys

After rebooting the device, access should be granted again.

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