Update ToolbarButton TS

src/dom_components/model/Toolbar.js

@@ -1,4 +0,0 @@
-import Backbone from 'backbone';
-import ToolbarButton from './ToolbarButton';
-
-export default Backbone.Collection.extend({ model: ToolbarButton });

src/dom_components/model/Toolbar.ts

@@ -0,0 +1,6 @@
+import { Collection } from '../../common';
+import ToolbarButton from './ToolbarButton';
+
+export default class Toolbar extends Collection<ToolbarButton> {}
+
+Toolbar.prototype.model = ToolbarButton;