fix(tabs): Fix activeElement check #193 (#194)

* Fix activeElement check #193

* Add test and fix check

Author: michaelwnelson

Diff for: src/components/UncontrolledTabs.js

@@ -19,12 +19,20 @@ function isTabDisabled(node) {
   return node.getAttribute('aria-disabled') === 'true';
 }
 
-const canUseActiveElement = !!(
-  typeof window !== 'undefined' &&
-  window.document &&
-  window.document.activeElement
-);
-
+let canUseActiveElement;
+try {
+  canUseActiveElement = !!(
+    typeof window !== 'undefined' &&
+    window.document &&
+    window.document.activeElement
+  );
+} catch (e) {
+  // Work around for IE bug when accessing document.activeElement in an iframe
+  // Refer to the following resources:
+  // http://stackoverflow.com/a/10982960/369687
+  // https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/12733599
+  canUseActiveElement = false;
+}
 export default class UncontrolledTabs extends Component {
   static defaultProps = {
     className: 'react-tabs',

Diff for: src/components/__tests__/Tabs-node-test.js

@@ -0,0 +1,44 @@
+/**
+ * @jest-environment node
+ */
+/* eslint-env jest */
+import React from 'react';
+import Tab from '../Tab';
+import TabList from '../TabList';
+import TabPanel from '../TabPanel';
+import Tabs from '../Tabs';
+import { reset as resetIdCounter } from '../../helpers/uuid';
+
+function createTabs(props = {}) {
+  return (
+    <Tabs {...props}>
+      <TabList>
+        <Tab>Foo</Tab>
+        <Tab>Bar</Tab>
+        <Tab>
+          <a>Baz</a>
+        </Tab>
+        <Tab disabled>Qux</Tab>
+      </TabList>
+      <TabPanel>Hello Foo</TabPanel>
+      <TabPanel>Hello Bar</TabPanel>
+      <TabPanel>Hello Baz</TabPanel>
+      <TabPanel>Hello Qux</TabPanel>
+    </Tabs>
+  );
+}
+
+describe('ServerSide <Tabs />', () => {
+  beforeEach(() => resetIdCounter());
+
+  beforeAll(() => {
+    // eslint-disable-next-line no-console
+    console.error = error => {
+      throw new Error(error);
+    };
+  });
+
+  test('does not crash in node environments', () => {
+    expect(() => createTabs()).not.toThrow();
+  });
+});