visgraph: init window.eventHub as external emitter called in Vue. This implementation works with vue2, but is deprecated in vue3 !!

see https://vue3-fr.netlify.app/guide/migration/events-api.html#_2-x-syntax

src/Bundle/ChillPersonBundle/Resources/public/vuejs/VisGraph/App.vue

@@ -79,6 +79,12 @@ export default {
       }
 
    },
+   created() {
+      eventHub.$on('add-switch', this.addSwitch)
+   },
+   unmounted() {
+      eventHub.$off('add-switch', this.addSwitch)
+   },
    mounted() {
       console.log('=== mounted: init graph')
       this.initGraph()
@@ -118,6 +124,9 @@ export default {
          console.log('** click on node **')
          window.network.on('click', callback)
       },
+      addSwitch(edgeData) {
+         console.log('==> addSwitch <=======================', edgeData)
+      },
    }
 /*
    TODO / TO CHECK / TO UNDERSTAND