title: JSHint - ^ 'concise methods' is available in ES6
body: <p>I'm trying to submit a simple form using AJAX. I'm using grunt as task runner to compile my JS files and so.</p>
  
  <p>Here is what I did until now.</p>
  
  <pre><code>$("form").submit(function(event) {
      event.preventDefault();
  
      var formData = {
          $("#username").val(),
          $("#password").val()
      };
  
      $.ajax({
          url: 'xxx',
          type: 'POST',
          dataType: 'json',
          data: formData,
          encode: true
      })
      .done(function(data) {
          console.log(data);
  
      })
  });
  </code></pre>
  
  <p>My doubt is about a JShint error when the task is about to run</p>
  
  <blockquote>
    <p>$("#username").val(),
                         ^ 'concise methods' is available in ES6 (use esnext option) or Mozilla JS extensions (use moz).</p>
  </blockquote>
  
  <p>Here is my gruntfile (jshint task)</p>
  
  <pre><code>jshint: {
          ignore_warning: {
              options: {
                  '-W099': true,
                  /*'-W041': true,*/
                  '-W044': true,
                  '-W033': true,
                  '-W043': true,
                  '-W049': true,
                  '-W004': true,
                  '-W065': true,
                  '-W083': true, // Corrigir futuramente
              },  
              src: ['public/_assets/src/js/modules/*.js'],
          }
      }
  </code></pre>
  
  <p>What exactly does it means ? And how can I solve this error ?</p>
  
  <p>Thanks!</p>