JAVASCRIPT

react native debugger

$ brew update && brew cask install react-native-debugger

react native debugging

npx react-native log-ios
npx react-native log-android

react native debugger

React-Native Standalone Debugger:
https://github.com/jhen0409/react-native-debugger/releases

run react native with debugger breakpoint

let jsCode = `docuement.doPopUp() {
                        document.querySelector('#myBody').style.backgroundColor = 'red';
                        alert('hello world from webview');
                        }`;