rollup.config.mjs

/**
 * Copyright 2023 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import {nodeResolve} from '@rollup/plugin-node-resolve';
import terser from '@rollup/plugin-terser';
import copy from 'rollup-plugin-copy';
import css from 'rollup-plugin-css-only';

const isLocalEnv = process.env.BUILD_ENV === 'local';

export default [
  {
    input: 'build/static/js/index.js',
    plugins: [
      // Entry point for application build; can specify a glob to build multiple
      // HTML files for non-SPA app
      // html({
      //   input: 'index.html',
      // }),
      // Resolve bare module specifiers to relative paths
      nodeResolve(),
      // Minify JS
      terser({
        ecma: 2020,
        module: true,
        warnings: true,
      }),
      css({
        output: 'css/styles.css',
      }),
      copy({
        targets: [
          // Copy the img files
          {src: 'build/public/img/*', dest: 'dist/static/public/img'},
          // Copy the html file
          {src: 'src/static/index.html', dest: 'dist/static'},
        ],
        verbose: true,
      }),
    ],
    output: {
      dir: 'dist/static/public',
      sourcemap: isLocalEnv,
      entryFileNames: 'js/[name].js',
    },
    onwarn: warning => {
      if (warning.code === 'THIS_IS_UNDECLARED') {
        return;
      }
      if (warning.code === 'THIS_IS_UNDEFINED') {
        return;
      }

      console.warn(warning.message);
    },
    preserveEntrySignatures: 'strict',
  },
];