fix(plugins): save instance in constructor

js/src/alert.js

@@ -47,6 +47,9 @@ const ClassName = {
 class Alert {
   constructor(element) {
     this._element = element
+    if (this._element) {
+      Data.setData(element, DATA_KEY, this)
+    }
   }
 
   // Getters
@@ -129,7 +132,6 @@ class Alert {
 
       if (!data) {
         data = new Alert(this)
-        Data.setData(this, DATA_KEY, data)
       }
 
       if (config === 'close') {
@@ -148,7 +150,8 @@ class Alert {
  * Data Api implementation
  * ------------------------------------------------------------------------
  */
-EventHandler.on(document, Event.CLICK_DATA_API, Selector.DISMISS, Alert._handleDismiss(new Alert()))
+EventHandler
+  .on(document, Event.CLICK_DATA_API, Selector.DISMISS, Alert._handleDismiss(new Alert()))
 
 /**
  * ------------------------------------------------------------------------