Global non-persisted state with useEmailSelection composition function

src/components/BulkActionBar.vue

@@ -0,0 +1,21 @@
+<template>
+  <div>
+    {{emailSelection.emails.size}}
+  </div>
+</template>
+
+<script>
+  import { useEmailSelection } from '../composition/useEmailSelection';
+
+  export default {
+    setup(){
+      let { emailSelection } = useEmailSelection();
+      
+      return { emailSelection }
+    }    
+  }
+</script>
+
+<style scoped>
+
+</style>