nk-virtual/rollup.config.js

It is just an interface or wrapper around react library.

const path = require('path');
import babel from 'rollup-plugin-babel';

export default [{
    input: `./main.js`,
    output: [{
        file: `./index.js`,
        format: 'es',
    }],
    plugins: [
        babel({
            exclude: 'node_modules/**'
        })
    ]
}]