1. npm install --save-dev webpack
2. npm install --save-dev webpack-cli
3. npm install --save-dev webpack-merge
4. npm install -D babel-loader @babel/core @babel/preset-env webpack
5. npm install --save-dev sass-loader sass
6. npm install --save-dev postcss-loader postcss
7. npm install --save-dev autoprefixer
8. npm install --save-dev mini-css-extract-plugin
9. npm install webpack-remove-empty-scripts