This method does not exist? so will instantly through an error on the sample provided in the docs? https://facebook.github.io/react-native/docs/netinfo.html

  console.log('Initial, type: ' + connectionInfo.type + ', effectiveType: ' + connectionInfo.effectiveType);
});

Also the connectionInfo passed though on handleFirstConnectivityChange has no type or effectiveType, this passes a string wifi, none etc