webpack es6 modules for chrome extension

I have the following config for webpack and I am trying to make modules accessible to my content script. Basically, I want them to be packed and loaded from manifest as stand-alone modules (like global variables). For some reason, the bundle.js has no references to the modules but I can see the module code is exports.

What am I missing from my config?

My webpack.config.js

    const path = require('path');

module.exports = {
  entry: ['franc-min', 'trigram-utils', './src/index.js'],
  output: {
    filename: 'main.js',
    path: path.resolve(__dirname, 'dist'),
  },
  resolve: {
    descriptionFiles: ['package.json'],
  },
  devtool: 'source-map',
};

My index.js

import { franc } from 'franc-min';