Destructure window to retrieve global variables

Author: pierlon

.eslintrc

@@ -1,9 +1,4 @@
 {
-  "globals": {
-    "alert": true,
-    "history": true,
-    "parent": true
-  },
   "root": true,
   "extends": [
     "plugin:@wordpress/eslint-plugin/recommended",

assets/src/admin/paired-browsing/app.js

@@ -1,4 +1,4 @@
-/* global ampSlug, ampPairedBrowsingQueryVar */
+const { ampSlug, ampPairedBrowsingQueryVar, alert, history } = window;
 
 class PairedBrowsingApp {
 	/**

assets/src/admin/paired-browsing/client.js

@@ -1,3 +1,5 @@
+const { parent } = window;
+
 if ( parent.pairedBrowsingApp ) {
 	window.ampPairedBrowsingClient = true;
 	const app = parent.pairedBrowsingApp;