Improve propTypes in ValueOptions

Author: wojtekmaj

test/ValueOptions.jsx

@@ -83,11 +83,11 @@ export default function ValueOptions({ setValue, value }) {
   );
 }
 
+const isValue = PropTypes.oneOfType([PropTypes.string, PropTypes.instanceOf(Date)]);
+
+const isValueOrValueArray = PropTypes.oneOfType([isValue, PropTypes.arrayOf(isValue)]);
+
 ValueOptions.propTypes = {
   setValue: PropTypes.func.isRequired,
-  value: PropTypes.oneOfType([
-    PropTypes.string,
-    PropTypes.instanceOf(Date),
-    PropTypes.arrayOf(PropTypes.oneOfType([PropTypes.string, PropTypes.instanceOf(Date)])),
-  ]),
+  value: isValueOrValueArray,
 };