This tutorial shows you how to set up a basic LitElement project by webpack with polyfills and es5 umd format support Legacy browser. This start kit was inspired by the lit-element/starting-a-lit-element-project and Video. https://youtu.be/UcCsGZDCw-Q
npm run serve
npm run serve:sw # webpack-dev-server with sw build
npm run build
npx serve dist # run static server for dist/ by npx