title: Conditional filename in webpack config output
body: <p>my current webpack output config is as follows:</p>
  
  <pre><code>output: {
      path: PATHS.build,
      filename: '/[name].[chunkhash].js',
      chunkFilename: '/[chunkhash].js'
  }
  </code></pre>
  
  <p>However, I have one entry file (custom.js) that I don't want to add [chunkhash] suffix. all others I do want to add the chuckhash suffix after the file name. Essentially:</p>
  
  <pre class="lang-js prettyprint-override"><code>if (name is 'custom') {
      filename: '/[name].js'
  } else {
      filename: '/[name].[chunkhash].js'
  }
  </code></pre>
  
  <p><strong>How can I achieve this?</strong> </p>