Introduce comments below events

Also add tomstones

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

js/src/shims-vue.d.ts

@@ -1,4 +1,8 @@
+import { Vue } from 'vue/types/vue';
+
 declare module '*.vue' {
   import Vue from 'vue';
   export default Vue;
 }
+
+type Refs<T extends object> = Vue['$refs'] & T;