Fixup widget and approvals store.

app/assets/javascripts/merge_request_widget/approvals/stores/approvals_store.js.es6

@@ -23,21 +23,20 @@
 
     fetch() {
       return this.api.fetchApprovals()
-        .then((res) => this.assignToRootStore(res.data));
+        .then(res => this.assignToRootStore(res.data));
     }
 
     approve() {
       return this.api.approveMergeRequest()
-        .then((data) => this.rootStore.assignToData(data));
+        .then(res => this.rootStore.assignToData(res.data));
     }
 
     unapprove() {
       return this.api.unapproveMergeRequest()
-        .then((data) => this.rootStore.assignToData(data));
+        .then(res => this.rootStore.assignToData(res.data));
     }
   }
 
   gl.ApprovalsStore = ApprovalsStore;
 })();
 
-

app/assets/javascripts/merge_request_widget/widget_bundle.js.es6

@@ -5,7 +5,7 @@
 
   $(() => {
     const rootEl = document.getElementById('merge-request-widget-app');
-    const widgetSharedStore = new gl.MergeRequestWidgetStore(rootEl); // TODO: encapsulate better
+    const widgetSharedStore = new gl.MergeRequestWidgetStore(rootEl);
 
     gl.MergeRequestWidgetApp = new Vue({
       el: rootEl,

app/assets/javascripts/merge_request_widget/widget_store.js.es6

@@ -22,8 +22,8 @@
     }
 
     initApprovals() {
-      const approvalsStore = new gl.ApprovalsStore(this);
-      this.assignToData('approvals', approvalsStore.data);
+      gl.ApprovalsStore = new gl.ApprovalsStore(this);
+      this.assignToData('approvals', this.dataset.approvals);
     }
 
     assignToData(key, val) {