Remove abab dependency

lib/jsdom/browser/Window.js

@@ -15,7 +15,6 @@ const { fireAPageTransitionEvent } = require("../living/helpers/page-transition-
 const namedPropertiesWindow = require("../living/named-properties-window");
 const postMessage = require("../living/post-message");
 const DOMException = require("domexception/webidl2js-wrapper");
-const { btoa, atob } = require("abab");
 const idlUtils = require("../living/generated/utils");
 const WebSocketImpl = require("../living/websockets/WebSocket-impl").implementation;
 const BarProp = require("../living/generated/BarProp");
@@ -757,25 +756,27 @@ function Window(options) {
   this.postMessage = postMessage(window);
 
   this.atob = function (str) {
-    const result = atob(str);
-    if (result === null) {
+    try {
+      return atob(str);
+    } catch (e) {
+      // Convert Node.js DOMException to one from our global.
       throw DOMException.create(window, [
         "The string to be decoded contains invalid characters.",
         "InvalidCharacterError"
       ]);
     }
-    return result;
   };
 
   this.btoa = function (str) {
-    const result = btoa(str);
-    if (result === null) {
+    try {
+      return btoa(str);
+    } catch (e) {
+      // Convert Node.js DOMException to one from our global.
       throw DOMException.create(window, [
         "The string to be encoded contains invalid characters.",
         "InvalidCharacterError"
       ]);
     }
-    return result;
   };
 
   this.stop = function () {

package.json

@@ -20,7 +20,6 @@
   "license": "MIT",
   "repository": "jsdom/jsdom",
   "dependencies": {
-    "abab": "^2.0.6",
     "cssstyle": "^3.0.0",
     "data-urls": "^4.0.0",
     "decimal.js": "^10.4.3",