   fs.readFile @path, <span class="hljs-string">"utf8"</span>, <span class="hljs-function"><span class="hljs-params">(err, contents)</span> =&gt;</span>
          <span class="hljs-keyword">if</span> err
            callback <span class="hljs-literal">true</span>
          <span class="hljs-keyword">else</span>
            callback @source <span class="hljs-keyword">isnt</span> contents.trim()
      <span class="hljs-keyword">else</span>
        callback <span class="hljs-literal">true</span></pre></div></d