Install Node, Watchman & React Native CLI as described here.

Install dependencies with Yarn, and link them with React Native CLI.

$ yarn install
$ sudo gem install cocoapods

NB: You may need to open the Android project in Android Studio before it builds.

• Get a Google Maps API Key

A Google Maps API Key is needed at compilation time for Android (see AndroidManifest.xml).

You will need to have the Google Maps Android API service enabled.

• Create a gradle.properties file in GRADLE_USER_HOME (defaults to ~/.gradle)

Learn more about configuring Gradle Build Environment

googleMapsApiKey=YOUR_API_KEY

• Download Android Studio

NB: You may need to open the iOS project in xCode before it builds.

react-native run-ios

yarn test

« Have you tried turning it off and on again? »

watchman watch-del-all
rm -rf node_modules
rm -rf $TMPDIR/react-*
rm -rf $TMPDIR/haste-map-react-native-packager-*
rm -rf ~/.rncache
rm yarn.lock
yarn cache clean
yarn install
react-native link