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

• on Windows
• on Mac OS X
• on Linux

• Install the Ionide VS Code extension for F#
• Install the VS Code extension for React Native
• Go to https://facebook.github.io/react-native/ and do all steps of the getting started tutorial
• At this point you should have the default Javascript React Native "Hello World" running

• Pull latest master
• Open Android Simulator or connect a device in debug mode via USB
• Run build.cmd debug from command prompt
• Go to android device simulator and you should see something like

• 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:

If you run build.cmd debug and it compiles everything, but nothing happens... go to the packager output 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.

If the above does not work, and still nothing happens after it compiles everything, the licenses may need to be accepted on your computer. To accept the licenses run the following commands for your platform

On a Mac run the following

$ANDROID_HOME/tools/bin/sdkmanager --update

On Windows run the following

“%ANDROID_HOME%\tools\bin\sdkmanager” --update

Re-run the build script and everything should work.