rollup.config.js

import esbuild from 'rollup-plugin-esbuild';
import { nodeResolve } from '@rollup/plugin-node-resolve';
import commonjs from '@rollup/plugin-commonjs';

const input = './index.ts';
const plugins = [
  nodeResolve({ preferBuiltins: false, browser: true }),
  commonjs(),
  esbuild({
    minify: true,
    tsconfig: './tsconfig.json',
    loaders: {
      '.json': 'json',
    },
  }),
];

export default function createConfig(
  packageName,
  packageDependencies,
  umd = {},
  cjs = {},
  es = {},
) {
  return [
    {
      input,
      plugins,
      output: {
        file: './dist/index.umd.js',
        format: 'umd',
        exports: 'named',
        name: packageName,
        sourcemap: true,
        ...umd,
      },
    },
    {
      input,
      plugins,
      external: packageDependencies,
      output: [
        {
          file: './dist/index.cjs.js',
          format: 'cjs',
          exports: 'named',
          name: packageName,
          sourcemap: true,
          ...cjs,
        },
        {
          file: './dist/index.es.js',
          format: 'es',
          exports: 'named',
          name: packageName,
          sourcemap: true,
          ...es,
        },
      ],
    },
  ];
}