Add an SSR-safe check for the Element type

Resolves #259.

Author: jakezatecky

CHANGELOG.md

@@ -1,5 +1,11 @@
 # Changelog
 
+## [6.0.2](https://github.com/jakezatecky/react-dual-listbox/compare/v6.0.0...v6.0.2) (2023-02-06)
+
+### Fixed
+
+* Add SSR-safe check for the `Element` type
+
 ## [6.0.1](https://github.com/jakezatecky/react-dual-listbox/compare/v6.0.0...v6.0.1) (2023-12-13)
 
 ### Fixed

src/js/shapes/refShape.js

@@ -1,8 +1,9 @@
 import PropTypes from 'prop-types';
 
+const elementType = typeof Element === 'undefined' ? () => {} : Element;
 const refShape = PropTypes.oneOfType([
     PropTypes.func,
-    PropTypes.shape({ current: PropTypes.instanceOf(Element) }),
+    PropTypes.shape({ current: PropTypes.instanceOf(elementType) }),
 ]);
 
 export default refShape;