refactor: convert function expressions to declarations (#4926)

packages/netlify-cms-widget-select/src/SelectPreview.js

@@ -4,20 +4,24 @@ import { List } from 'immutable';
 import ImmutablePropTypes from 'react-immutable-proptypes';
 import { WidgetPreviewContainer } from 'netlify-cms-ui-default';
 
-const ListPreview = ({ values }) => (
-  <ul>
-    {values.map((value, idx) => (
-      <li key={idx}>{value}</li>
-    ))}
-  </ul>
-);
+function ListPreview({ values }) {
+  return (
+    <ul>
+      {values.map((value, idx) => (
+        <li key={idx}>{value}</li>
+      ))}
+    </ul>
+  );
+}
 
-const SelectPreview = ({ value }) => (
-  <WidgetPreviewContainer>
-    {value && (List.isList(value) ? <ListPreview values={value} /> : value)}
-    {!value && null}
-  </WidgetPreviewContainer>
-);
+function SelectPreview({ value }) {
+  return (
+    <WidgetPreviewContainer>
+      {value && (List.isList(value) ? <ListPreview values={value} /> : value)}
+      {!value && null}
+    </WidgetPreviewContainer>
+  );
+}
 
 SelectPreview.propTypes = {
   value: PropTypes.oneOfType([PropTypes.string, ImmutablePropTypes.list]),