Move ToolbarButton to TS

src/dom_components/model/ToolbarButton.js

@@ -1,10 +0,0 @@
-import Backbone from 'backbone';
-
-export default class ToolbarButton extends Backbone.Model {
-  defaults() {
-    return {
-      command: '',
-      attributes: {},
-    };
-  }
-}

src/dom_components/model/ToolbarButton.ts

@@ -0,0 +1,10 @@
+import { Model } from '../../common';
+
+export default class ToolbarButton extends Model {
+  defaults() {
+    return {
+      command: '',
+      attributes: {},
+    };
+  }
+}