rollup.config.js

import babel from 'rollup-plugin-babel';
import pkg from './package.json';

export default {
    input: './src/index.js',
    plugins: [babel()],
    external: ['path', '@webpack-blocks/webpack2'],
    sourcemap: true,
    output: [
        {
            file: pkg.main,
            format: 'cjs',
        },
        {
            file: pkg.module,
            format: 'es',
        },
    ],
};