(chore) check if element already registered

Author: antoine92190

src/lib/index.js

@@ -3,6 +3,10 @@ import ChatWindow from './ChatWindow'
 
 export const VueAdvancedChat = defineCustomElement(ChatWindow)
 
+const PACKAGE_NAME = 'vue-advanced-chat'
+
 export function register() {
-	customElements.define('vue-advanced-chat', VueAdvancedChat)
+	if (!customElements.get(PACKAGE_NAME)) {
+		customElements.define(PACKAGE_NAME, VueAdvancedChat)
+	}
 }