rollup.config.js

/**
 * @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: 'lit-html.js',
  output: {
    file: 'lit-html.bundled.js',
    format: 'esm',
  },
  plugins: [
    terser({
      warnings: true,
      ecma: 2017,
      compress: {
        unsafe: true,
      },
      output: {
        comments: false,
      },
      mangle: {
        properties: {
          regex: /^__/,
        },
      },
    }),
    filesize({
      showBrotliSize: true,
    })
  ]
}