LitElement Widget Bundle

rollup.config.js

import resolve from 'rollup-plugin-node-resolve';
import commonjs from 'rollup-plugin-commonjs';

export default [
  // es2017 standalone bundle
  {
    input: 'src/hello-element.js',
    output: {
      file: `lib/hello-element.bundle.js`,
      format: 'iife',
    },
    plugins: [resolve(), commonjs()]
  }
];