Javascript/reactnative/helloworld/react-native-cli

react-native-cliを使ったhelloworld

$ react-native init hello

以下構成で作成される

App.js
__tests__ [dir]
android [dir]
app.json
babel.config.js
index.js
ios [dir]
metro.config.js
node_modules [dir]
package.json
yarn.lock

実行

cd hello
react-native run-android # android
react-native run-ios # ios

Android実行

removed in Gradle 7.0削除エラー

以下エラーが出て失敗。

Internal API constructor DefaultDomainObjectSet(Class<T>) has been deprecated. This is scheduled to be removed in Gradle 7.0. Please use ObjectFactory.domainObjectSet(Class<T>) instead.

謎

端末表示失敗

warn No apps connected. Sending "reload" to all React Native apps failed. Make sure your app is running in the simulator or on a phone connected via USB.

react-nativeを0.59から0.62に上げると、このエラーになったとの情報があるので、react-native本体バージョンを指定して作成し直す。

react-native init hello59 --version 0.59

参考：https://github.com/facebook/react-native/issues/29396

参考

https://snova301.hatenablog.com/entry/2019/05/05/231232