npm i -ED webpack@3 optimize-css-assets-webpack-plugin@3 vue-loader@1
# optimize-css-assets-webpack-plugin → 3.2.0
# vue-loader → 13.7.2
# webpack → 3.12.0
available commands
yarn install
yarn dev
yarn build
yarn build --report
yarn deploy
For detailed explanation on how things work, checkout the guide and docs for vue-loader.