title: Passing arguments to 'loader'
body: <p>I have a parent component A, creating a child component B.
  This child component's definition is imported using Loadable. In the following, component B is the Catalog.</p>
  
  <p>Now I want to fetch some initial data before rendering this component, as it is described in the doc. Here's what I have :</p>
  
  <pre class="lang-js prettyprint-override"><code>const Catalog = Loadable.Map({
      loader: {
          Catalog: () =&gt; import('./Catalog'),
          initialData: () =&gt; fetchCatalogInitialData(foo1, foo2),
      },
      loading: () =&gt; {return &lt;div&gt;foo&lt;/div&gt;},
      render(loaded, props) {
          let Catalog = loaded.Catalog.default;
          let initialData = loaded.initialData;
          return  &lt;Catalog {...props} initialData={initialData} /&gt;;
      },
  });
  </code></pre>
  
  <p>I'd like <code>fetchCatalogInitialData</code> to be called with parameters, i.e a URL, a token, etc. Is this doable in a nice way?</p>