rollup.config.js

import { babel } from '@rollup/plugin-babel';
import commonjs from '@rollup/plugin-commonjs';
import resolve from '@rollup/plugin-node-resolve';
import typescript from '@rollup/plugin-typescript';
import peerDepsExternal from 'rollup-plugin-peer-deps-external';
import styles from 'rollup-plugin-styles';

// eslint-disable-next-line import/extensions
import pkg from './package.json';

export default {
  input: 'src/index.ts',

  output: [
    {
      file: pkg.main,
      format: 'cjs',
      sourcemap: true,
      // https://rollupjs.org/configuration-options/#output-interop
      // Necessary in order for jest in consumers to work
      interop: 'auto',
    },
    {
      file: pkg.module,
      format: 'esm',
      sourcemap: true,
    },
  ],

  // this resolves to window in the browser, thus enabling caching in the antd code below
  // (!) `this` has been rewritten to `undefined`
  // https://rollupjs.org/guide/en/#error-this-is-undefined
  //     node_modules/antd/es/affix/index.js
  // 7: import _typeof from "@babel/runtime/helpers/esm/typeof";
  // 8:
  // 9: var __decorate = this && this.__decorate || function (decorators, target, key, desc) {
  context: 'this',

  // https://www.npmjs.com/package/@rollup/plugin-babel#babelhelpers
  external: [/@babel\/runtime/],

  plugins: [
    peerDepsExternal(),
    resolve(),
    commonjs(),
    typescript({
      exclude: '**/*.(test|stories).(ts|tsx)',
    }),
    styles({
      less: {
        javascriptEnabled: true,
      },
    }),
    babel({
      // https://www.npmjs.com/package/@rollup/plugin-babel#babelhelpers
      babelHelpers: 'runtime',
    }),
  ],
};