Next up are Watchman and Flow. Again, Flow is entirely optional. If you wish to experiment with it, you're welcomed to install it. It won't hurt anything. If you'd rather skip it for now, that's totally fine as well.
From the terminal, run
brew install watchman:
And if you wish, run
brew install flow.
Okay! We're almost done with installing everything. There's just one more it we need: the React Native CLI. Again, from the terminal, run
npm install -g react-native-cli. Using npm, this will globally (
-g) install the React Native CLI that you'll use to scaffold your React Native applications. ...