title: How to add a js file with webpack?
body: <p>I was reading this webpack tutorial:</p>
  
  <p><a href="https://webpack.github.io/docs/usage.html" rel="noreferrer">https://webpack.github.io/docs/usage.html</a></p>
  
  <p>It says it bundles the src files and node_modules. If I want to add another .js file there, how can I do this? This is a thirdpartyjs file that is not part of the source and not part of the node_modules files. This is my current webpack.config.js:</p>
  
  <pre><code>var path = require('path');
  var webpack = require('webpack');
  
  module.exports = {
      entry: [
          'react-hot-loader/patch',
          'webpack-dev-server/client?http://localhost:8080',
          'webpack/hot/only-dev-server',
          './app/app.js'
      ],
      output: {
          path: path.resolve(__dirname, "dist"),
          publicPath: "/dist/",
          filename: "dist.js",
          sourceMapFilename: "dist.map"
      },
      devtool: 'source-map',
      plugins: [
          new webpack.HotModuleReplacementPlugin(),
          new webpack.DefinePlugin({
              'process.env': {
                  'NODE_ENV': JSON.stringify('development')
              }
          }),
      ],
      module: {
          loaders: [{
              loader: 'babel',
              exclude: /node_modules/
          }]
      },
      devServer: {
          inline: true
      },
      node: {
          fs: "empty"
      },
      watch: false
  }
  </code></pre>