text: /**
   * @license
   * Copyright (c) 2018 The Polymer Project Authors. All rights reserved.
   * This code may only be used under the BSD style license found at
   * http://polymer.github.io/LICENSE.txt
   * The complete set of authors may be found at
   * http://polymer.github.io/AUTHORS.txt
   * The complete set of contributors may be found at
   * http://polymer.github.io/CONTRIBUTORS.txt
   * Code distributed by Google as part of the polymer project is also
   * subject to an additional IP rights grant found at
   * http://polymer.github.io/PATENTS.txt
   */
  
   import filesize from 'rollup-plugin-filesize';
   import { terser } from 'rollup-plugin-terser';
   
   export default {
     input: 'index.js',
     output: {
       file: 'bundled.js',
       format: 'esm',
     },
     plugins: [
       terser({
         warnings: true,
         ecma: 2020,
         compress: {
           unsafe: true,
         },
         output: {
           comments: false,
         },
         mangle: {
           properties: {
             regex: /^_/,
           },
         },
       }),
       filesize({
         showBrotliSize: true,
       })
     ]
   }