rollup.config.js

import commonjs from '@rollup/plugin-commonjs';
import resolve from '@rollup/plugin-node-resolve';
import babel from 'rollup-plugin-babel';
import alias from '@rollup/plugin-alias';
import json from '@rollup/plugin-json';
import path from 'path';
import packageJSON from './package.json';
import typescript from '@rollup/plugin-typescript';
import replace from '@rollup/plugin-replace';
import { uglify } from "rollup-plugin-uglify";
import gzipPlugin from 'rollup-plugin-gzip'
import { compress } from 'brotli';
import image from '@rollup/plugin-image';

const banner = () => {

  const {
    version,
    name,
    license,
    homepage,
  } = packageJSON;

  const banner = `
  /**
   * Generated on: ${Date.now()} 
   *      Package: ${name}
   *      Version: v${version}
   *      License: ${license}
   *         Docs: ${homepage}
   */

    `;
  return banner;

}

const extensions = [
  '.js', '.jsx', '.ts', '.tsx',
];

const formats = ['esm', 'umd'] // 'cjs'

function globals() {
  return {
    'react': 'React',
    'react-dom': 'ReactDOM',
    'classnames': 'classNames',
    'react-popper': 'ReactPopper',
  };
}

const baseConfig = {
  input: './core/index.tsx',
  // Specify here external modules which you don't want to include in your bundle (for instance: 'lodash', 'moment' etc.)
  // https://rollupjs.org/guide/en#external-e-external
  external: ['react', 'react-dom'],
}

const commonJsPlugins =  [
    alias({
      entries: [
        { find: '@', replacement: path.resolve('./core') },
      ]
    }),
    
    // Allows node_modules resolution
    resolve({ extensions, preferBuiltins: false }),

    // Allow bundling cjs modules. Rollup doesn't understand cjs
    commonjs(),

    // Compile TypeScript/JavaScript files
    babel({ extensions, include: ['core/**/*'] }),

    image(),

    json(),

    replace({
      'process.env.NODE_ENV': JSON.stringify('production')
    }),
    uglify()
  ]

const jsUmdOutputConfig = {
    file: 'dist/index.umd.js',
    format: 'umd',
    name: `InnovaccerDesignSystem`,
    globals: globals(),
    banner: banner()
}

const jsUmdConfig = {
  ...baseConfig,
  plugins: commonJsPlugins,
  output: jsUmdOutputConfig  

}

const jsEsmConfig = {
  ...baseConfig,
  // react-lottie-player was marked external in esm build to prevent the build from including code that actually required Web APIs like document.getElementsByTagName, etc.
  external: [...baseConfig.external, '@lottiefiles/react-lottie-player'],
  // Slice is used here to remove uglify compression during esm builds
  plugins: commonJsPlugins.slice(0,-1),
  output: {
    file: 'dist/index.esm.js',
    format: 'esm',
    name: `InnovaccerDesignSystem`,
    globals: globals(),
    banner: banner()
  }
}

const tsConfig = {
  ...baseConfig,
  external: ['react', 'react-dom', 'classnames', 'react-popper'],
  plugins: [
    alias({
      entries: [
        { find: '@', replacement: path.resolve('./core') },
      ]
    }),

    image(),

    json(),
    
    // Allows node_modules resolution
    resolve({ extensions }),
    
    typescript({
      typescript: require('ttypescript'),
      tsconfig: path.resolve(__dirname, './tsconfig.type.json'),
    }),

    // Allow bundling cjs modules. Rollup doesn't understand cjs
    commonjs(),

    // Compile TypeScript/JavaScript files
    babel({ extensions, include: ['core/**/*'] }),
  ],
  output: {
    dir: 'dist',
    format: 'umd',
    name: `inno`,
    globals: globals(),
    banner: banner(),
    sourcemap: true,
  }
}

const brotliConfig = {
  ...baseConfig,
  plugins: [
    gzipPlugin({
	    customCompression: content => compress(Buffer.from(content)),
	    fileName: '.br',
    }),
    ...commonJsPlugins
  ],

  output: jsUmdOutputConfig  
}

const gzipConfig = {
  ...baseConfig,
  plugins: [
    gzipPlugin(),
    ...commonJsPlugins
  ],

  output: jsUmdOutputConfig  
}

export default [jsUmdConfig, jsEsmConfig, tsConfig, brotliConfig, gzipConfig];