portfolio/rollup.config.js

import npm from 'rollup-plugin-node-resolve';

export default {
  input: './src/js/d3.bundle.js',
  format : 'iife',
  name : 'd3',
  plugins: [
    npm(
      {jsnext: true}
    )
  ],
  output : './assets/js/d3.bundle.'
};