rollup.config.js

/*
 Copyright 2020 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

     https://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 babel from '@rollup/plugin-babel';
import terser from '@rollup/plugin-terser';

const configurePlugins = ({module}) => {
  return [
    babel({
      babelHelpers: 'bundled',
      presets: [
        [
          '@babel/preset-env',
          {
            bugfixes: true,
            targets: 'baseline widely available',
          },
        ],
      ],
    }),
    terser({
      module,
      compress: true,
      mangle: {
        properties: {
          // Any object properties beginning with the '_' character will be
          // mangled. Use this prefix for any object properties that are not
          // part of the public API and do that not match an existing build-in
          // API names (e.g. `.id` or `.entries`).
          regex: /^_/,
        },
      },
    }),
  ];
};

const configs = [
  {
    input: 'dist/modules/index.js',
    output: {
      format: 'esm',
      file: './dist/web-vitals.js',
    },
    plugins: configurePlugins({module: true}),
  },
  {
    input: 'dist/modules/index.js',
    output: {
      format: 'umd',
      file: `./dist/web-vitals.umd.cjs`,
      name: 'webVitals',
    },
    plugins: configurePlugins({module: false}),
  },
  {
    input: 'dist/modules/index.js',
    output: {
      format: 'iife',
      file: './dist/web-vitals.iife.js',
      name: 'webVitals',
    },
    plugins: configurePlugins({module: false}),
  },
  {
    input: 'dist/modules/attribution/index.js',
    output: {
      format: 'esm',
      file: './dist/web-vitals.attribution.js',
    },
    plugins: configurePlugins({module: true}),
  },
  {
    input: 'dist/modules/attribution/index.js',
    output: {
      format: 'umd',
      file: `./dist/web-vitals.attribution.umd.cjs`,
      name: 'webVitals',
    },
    plugins: configurePlugins({module: false}),
  },
  {
    input: 'dist/modules/attribution/index.js',
    output: {
      format: 'iife',
      file: './dist/web-vitals.attribution.iife.js',
      name: 'webVitals',
    },
    plugins: configurePlugins({module: false}),
  },
];

export default configs;