rollup.config.js

// Contents of the file /rollup.config.js
import typescript from 'rollup-plugin-typescript2';
import dts from "rollup-plugin-dts";
import terser from '@rollup/plugin-terser';
import resolve from '@rollup/plugin-node-resolve';
import commonjs from '@rollup/plugin-commonjs';

const config = [
  {
    input: 'src/index.ts',
    output: {
      file: 'dist/index.cjs',
      format: 'cjs',
      exports: 'auto',
      sourcemap: true,
    },
    plugins: [
      resolve(),
      commonjs(),
      typescript(),
      // terser(),
    ]
  },
  {
    input: 'src/index.ts',
    output: {
      file: 'dist/index.esm.js',
      format: 'esm',
      sourcemap: true,
    },
    plugins: [
      resolve(),
      commonjs(),
      typescript(),
      // terser(),
    ]
  },
  {
    input: 'dist/index.d.ts',
    output: {
      file: 'dist/index.d.ts',
      format: 'esm'
    },
    plugins: [dts()]
  },
];
export default config;