title: Forcing Snowpack to build into one file
body: <p>Snowpack dev is very cool - but for my needs I will need all js/css/images
  packed into exactly <strong>one</strong> <code>bundle.js</code> file. No chunks or anything else.</p>
  <p>I have tried using the following webpack plugin config in <code>snowpack.config.js</code>'s
  <code>plugins</code>:</p>
  <pre class="lang-js prettyprint-override"><code>    [
        &quot;@snowpack/plugin-webpack&quot;,
        {
          outputPattern: {
            js: &quot;bundle.js&quot;,
            css: &quot;bundle.css&quot;,
          },
          extendConfig: (config) =&gt; {
            delete config.optimization.splitChunks;
            delete config.optimization.runtimeChunk;
            return config;
          },
        },
      ],
  </code></pre>
  <p>Which results in creating these two files: <code>bundle.js</code> and <code>bundle.css</code></p>
  <p>Is there a simple way to:</p>
  <ol>
  <li>Pack everything only into <code>build.js</code>without the css file?</li>
  <li>Automatically get rid of all the other files still left in the build
  folder (<code>__snowpack__</code>, <code>web_modules</code>, source files)?</li>
  </ol>