yarn global add expo-cli
cd /react/
expo init DaiyanDaigakuReact
cd DaiyanDaigakuReact/
kobayashi.@kobayashinoiMac DaiyanDaigakuReact % yarn start
yarn run v1.22.19
$ expo start
┌─────────────────────────────────────────────────────────────────────────┐
│ │
│ There is a new version of expo-cli available (5.4.7). │
│ You are currently using expo-cli 5.4.6 │
│ Install expo-cli globally using the package manager of your choice; │
│ for example: `npm install -g expo-cli` to get the latest version │
│ │
└─────────────────────────────────────────────────────────────────────────┘
Starting project at /Users/kobayashi./react/DaiyanDaigakuReact
Developer tools running on http://localhost:19002
Opening developer tools in the browser...
Starting Metro Bundler
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› Metro waiting on exp://192.168.1.6:19000
› Scan the QR code above with Expo Go (Android) or the Camera app (iOS)

› Press a │ open Android
› Press i │ open iOS simulator
› Press w │ open web

› Press r │ reload app
› Press m │ toggle menu
› Press d │ show developer tools
› shift+d │ toggle auto opening developer tools on startup (enabled)

› Press ? │ show all commands

Logs for your project will appear below. Press Ctrl+C to exit.
Started Metro Bundler
› Opening exp://192.168.1.6:19000 on iPhone 8
expo account
jazzbass email:jazzbass.s.k@gmail.com
パスワードはいつもの！！
参考サイト
https://www.youtube.com/watch?v=eyXphecowKI
https://www.youtube.com/watch?v=Vtz-wHS6SPQ&t=2452s
【Mac編】ReactNativeを使って環境構築
https://deha.co.jp/magazine/react-native1/