use a module to check

scripts/external/check.js

@@ -0,0 +1,19 @@
+/*
+check.js
+
+Check if a website is supported. 
+*/
+
+import filters from '/scripts/filters.js';
+
+export default class check {
+     /* 
+     Check if an e-commerce platform is supported. 
+
+     @param {string} URL
+     @returns {object} the support state
+     */
+     static async platform (URL = window.location.href) {
+          return (await ((new filters).select(URL)));
+     }
+}