Fix opener access errors

src/__tests__/index.browser.js

@@ -52,3 +52,25 @@ test('Get exception stack frames', t => {
 
   t.end();
 });
+
+test("Don't break on cross-origin exceptions", t => {
+  t.plan(1);
+
+  const app = new App('test', el => el);
+
+  window.opener = new Proxy(
+    {},
+    {
+      get: () => {
+        // Simulate an Exception on all access to `window.opener`
+        throw new Error('Simulated `DOMException`');
+      },
+    }
+  );
+
+  app.register(ErrorHandlingPlugin);
+
+  t.doesNotThrow(() => getSimulator(app));
+
+  t.end();
+});

src/client.js

@@ -34,7 +34,7 @@ const plugin =
           throw e;
         };
       }
-      for (const key in window) {
+      const addListener = key => {
         if (
           key.match(/webkit/) == null && // stop deprecation warnings
           window[key] &&
@@ -55,6 +55,13 @@ const plugin =
             return old.call(this, type, cb, ...rest);
           };
         }
+      };
+      for (const key in window) {
+        try {
+          addListener(key);
+        } catch (e) {
+          // Ignore. Don't have access to the prop, possibly cross-origin restriction.
+        }
       }
       window.addEventListener('unhandledrejection', e => {
         e.preventDefault();