title: UglifyJS throws error Unexpected token: operator (>)
body: <p>I currently have this </p>
  
  <pre><code>ready : function(){
      bus.$on('a-data', (param) =&gt; {
          this.name = param.name;
          this.age = param.age;
      })
  },
  </code></pre>
  
  <p>While this particular code run when <code>uglifyjs</code> is disabled, when enabled it throws the following error</p>
  
  <pre><code>SyntaxError: Unexpected token: operator (&gt;)
  </code></pre>
  
  <p>Here's my uglify config</p>
  
  <pre><code>new webpack.optimize.UglifyJsPlugin({
      minimize: true,
      sourceMap: false,
      compress: {
          warnings: false,
          sequences: true,
          dead_code: true,
          conditionals: true,
          booleans: true,
          unused: true,
          if_return: true,
          join_vars: true,
          drop_console: true
      }
  }))
  </code></pre>
  
  <p>I can't seem to understand why it's not working.
  Any ideas?</p>