rollup.config.js

// rollup.config.js
import path from 'path';
import vue from 'rollup-plugin-vue';
import alias from '@rollup/plugin-alias';
import buble from '@rollup/plugin-buble';
import commonjs from 'rollup-plugin-commonjs';
import replace from '@rollup/plugin-replace';
import { terser } from 'rollup-plugin-terser';
import minimist from 'minimist';

const argv = minimist(process.argv.slice(2));

const projectRoot = path.resolve(__dirname);

const baseConfig = {
  input: 'src/index.js',
  plugins: {
    preVue: [
      replace({
        'process.env.NODE_ENV': JSON.stringify('production'),
      }),
      commonjs(),
      alias({
        resolve: ['.jsx', '.js', '.vue'],
        entries: {
          '@': path.resolve(projectRoot, 'src'),
        },
      }),
    ],
    vue: {
      css: true,
      template: {
        isProduction: true,
      },
    },
    postVue: [
      buble({ objectAssign: true, transforms: { asyncAwait: false, forOf: false } }),
    ],
  },
};

// ESM/UMD/IIFE shared settings: externals
// Refer to https://rollupjs.org/guide/en/#warning-treating-module-as-external-dependency
const external = [
  'axios',
  'bootstrap-vue',
  'druxt-blocks',
  'druxt-entity',
  'druxt-search',
  'druxt-views',
  'path',
  'parse5'
];

// UMD/IIFE shared settings: output.globals
// Refer to https://rollupjs.org/guide/en#output-globals for details
const globals = {
  axios: 'axios',
  'bootstrap-vue': 'bootstrapVue',
  'druxt-blocks': 'druxtBlocks',
  'druxt-entity': 'druxtEntity',
  'druxt-search': 'druxtSearch',
  'druxt-views': 'druxtViews',
  path: 'path',
  parse5: 'parse5'
};

// Customize configs for individual targets
const buildFormats = [];
if (!argv.format || argv.format === 'es') {
  const esConfig = {
    ...baseConfig,
    external,
    output: {
      file: 'dist/druxt-theme-umami-bootstrap.esm.js',
      format: 'esm',
      exports: 'named',
    },
    plugins: [
      ...baseConfig.plugins.preVue,
      vue(baseConfig.plugins.vue),
      ...baseConfig.plugins.postVue,
    ],
  };
  buildFormats.push(esConfig);
}

if (!argv.format || argv.format === 'cjs') {
  const umdConfig = {
    ...baseConfig,
    external,
    output: {
      compact: true,
      file: 'dist/druxt-theme-umami-bootstrap.ssr.js',
      format: 'cjs',
      name: 'VueDrupalEntity',
      exports: 'named',
      globals,
    },
    plugins: [
      ...baseConfig.plugins.preVue,
      vue({
        ...baseConfig.plugins.vue,
        template: {
          ...baseConfig.plugins.vue.template,
          optimizeSSR: true,
        },
      }),
      ...baseConfig.plugins.postVue,
    ],
  };
  buildFormats.push(umdConfig);
}

if (!argv.format || argv.format === 'iife') {
  const unpkgConfig = {
    ...baseConfig,
    external,
    output: {
      compact: true,
      file: 'dist/druxt-theme-umami-bootstrap.min.js',
      format: 'iife',
      name: 'VueDrupalEntity',
      exports: 'named',
      globals,
    },
    plugins: [
      ...baseConfig.plugins.preVue,
      vue(baseConfig.plugins.vue),
      ...baseConfig.plugins.postVue,
      terser({
        output: {
          ecma: 5,
        },
      }),
    ],
  };
  buildFormats.push(unpkgConfig);
}

// Export config
export default buildFormats;