git init npm install @babel/core @babel/cli --save-dev npm install @babel/preset-env --save-dev node_modules/.bin/babel before.js -o after.js npm install node_modules/.bin/babel before.js -o after.js node_modules/.bin/babel src/index.js -o dist/assets/bundle.js npm run babel npm install webpack webpack-cli --save-dev node_modules/.bin/webpack npm run webpack node_modules/.bin/webpack -w npm install webpack-dev-server npm install babel-loader