rollup.config.js

import resolve from '@rollup/plugin-node-resolve';
import { copy } from '@web/rollup-plugin-copy';
import { terser } from 'rollup-plugin-terser';
import minifyHTML from 'rollup-plugin-minify-html-literals';
import summary from 'rollup-plugin-summary';
import multiInput from 'rollup-plugin-multi-input';
import del from 'rollup-plugin-delete'

const copyConfig = {
  targets: [{ src: 'node_modules/@webcomponents', dest: 'build/node_modules' }],
};

const config = {
  input: [
    './src/components/**/*.js',
    '!./src/components/**/*.stories.js',
    '!./src/components/**/*.test.js',
    './src/i18n/generated/*',
  ],
  output: {
    dir: 'dist',
    format: 'es',
    sourcemap: true,
  },
  plugins: [
    del({ targets: 'dist/*' }),
    multiInput({
      relative: 'src/components',
      transformOutputPath: (output, input) => `${output.replace('src/i18n/', '')}`,
    }),
    // Resolve bare module specifiers to relative paths
    resolve(),
    // Minify HTML template literals
    minifyHTML(),
    // Minify JS
    terser({
      ecma: 2020,
      module: true,
      warnings: true,
    }),
    // Print bundle summary
    summary(),
    copy(copyConfig),
  ],
  preserveEntrySignatures: false,
};

export default config;