title: Slick.Grid is not a constructor
body: <p>I am using slickgrid on Symfony4</p>
  
  <p>Symfony4 uses <code>webpack</code> system.</p>
  
  <p>So my source code is like this ,</p>
  
  <p>but it shows the error </p>
  
  <p><code>Slick.Grid is not a constructor</code></p>
  
  <p>Normally this error means it doesn't load the variable, however I can't figure out where is wrong.</p>
  
  <p>in app.js</p>
  
  <pre><code>var $ = require('jquery');
  require('bootstrap');
  require('slickgrid');
  
  console.log(Slick); // it shows in console `{Event: ƒ, EventData: ƒ, EventHandler: ƒ, Range: ƒ, NonDataRow: ƒ, …}`
  
  
  $(document).ready(function() {
  
      var grid;
      var columns = [
        {id: "title", name: "Title", field: "title"},
        {id: "duration", name: "Duration", field: "duration"},
        {id: "%", name: "% Complete", field: "percentComplete"},
        {id: "start", name: "Start", field: "start"},
        {id: "finish", name: "Finish", field: "finish"},
        {id: "effort-driven", name: "Effort Driven", field: "effortDriven"}
      ];
  
      var options = {
        enableCellNavigation: true,
        enableColumnReorder: false
      };
  
        var data = [];
        for (var i = 0; i &lt; 500; i++) {
          data[i] = {
            title: "Task " + i,
            duration: "5 days",
            percentComplete: Math.round(Math.random() * 100),
            start: "01/01/2009",
            finish: "01/05/2009",
            effortDriven: (i % 5 == 0)
          };
        }
        grid = new Slick.Grid("#myGrid", data, columns, options);
  
  });
  </code></pre>