title: How to prepend outputs files with webpack?
body: <p>I am working with webpack to build librairies into a saleforce dx project. </p>
  
  <p>But I have an eslint validation when I push on github. </p>
  
  <p>This validation fail because it try to check the validity of the webpack outputs.</p>
  
  <p>I am trying to prepend the outputs files with <code>/* eslint-disable */</code> to disable eslint when I push.</p>
  
  <p>So I try:</p>
  
  <pre><code>rules: [
        {
          loader: '@shoutem/webpack-prepend-append',
          query: {
            prepend: '/* eslint-disable */'
          }
        }
      ]
  </code></pre>
  
  <p>But the comment is not showing at the top of the output file. I think it prepends the input file.</p>
  
  <p>How to prepend the <strong>outputs</strong> files with webpack ?</p>