refactor: convert function expressions to declarations (#4926)

packages/netlify-cms-widget-image/src/ImagePreview.js

@@ -10,11 +10,11 @@ const StyledImage = styled(({ src }) => <img src={src || ''} role="presentation"
   height: auto;
 `;
 
-const StyledImageAsset = ({ getAsset, value, field }) => {
+function StyledImageAsset({ getAsset, value, field }) {
   return <StyledImage src={getAsset(value, field)} />;
-};
+}
 
-const ImagePreviewContent = props => {
+function ImagePreviewContent(props) {
   const { value, getAsset, field } = props;
   if (Array.isArray(value) || List.isList(value)) {
     return value.map(val => (
@@ -22,15 +22,15 @@ const ImagePreviewContent = props => {
     ));
   }
   return <StyledImageAsset {...props} />;
-};
+}
 
-const ImagePreview = props => {
+function ImagePreview(props) {
   return (
     <WidgetPreviewContainer>
       {props.value ? <ImagePreviewContent {...props} /> : null}
     </WidgetPreviewContainer>
   );
-};
+}
 
 ImagePreview.propTypes = {
   getAsset: PropTypes.func.isRequired,

packages/netlify-cms-widget-image/src/index.js

@@ -3,13 +3,16 @@ import previewComponent from './ImagePreview';
 import schema from './schema';
 
 const controlComponent = NetlifyCmsWidgetFile.withFileControl({ forImage: true });
-const Widget = (opts = {}) => ({
-  name: 'image',
-  controlComponent,
-  previewComponent,
-  schema,
-  ...opts,
-});
+
+function Widget(opts = {}) {
+  return {
+    name: 'image',
+    controlComponent,
+    previewComponent,
+    schema,
+    ...opts,
+  };
+}
 
 export const NetlifyCmsWidgetImage = { Widget, controlComponent, previewComponent };
 export default NetlifyCmsWidgetImage;