refactor: convert function expressions to declarations (#4926)

packages/netlify-cms-widget-map/src/MapPreview.js

@@ -2,9 +2,9 @@ import React from 'react';
 import PropTypes from 'prop-types';
 import { WidgetPreviewContainer } from 'netlify-cms-ui-default';
 
-const MapPreview = ({ value }) => (
-  <WidgetPreviewContainer>{value ? value.toString() : null}</WidgetPreviewContainer>
-);
+function MapPreview({ value }) {
+  return <WidgetPreviewContainer>{value ? value.toString() : null}</WidgetPreviewContainer>;
+}
 
 MapPreview.propTypes = {
   value: PropTypes.string,

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

@@ -3,13 +3,16 @@ import previewComponent from './MapPreview';
 import schema from './schema';
 
 const controlComponent = withMapControl();
-const Widget = (opts = {}) => ({
-  name: 'map',
-  controlComponent,
-  previewComponent,
-  schema,
-  ...opts,
-});
+
+function Widget(opts = {}) {
+  return {
+    name: 'map',
+    controlComponent,
+    previewComponent,
+    schema,
+    ...opts,
+  };
+}
 
 export const NetlifyCmsWidgetMap = { Widget, controlComponent, previewComponent };
 export default NetlifyCmsWidgetMap;

packages/netlify-cms-widget-map/src/withMapControl.js

@@ -15,14 +15,18 @@ const formatOptions = {
   dataProjection: 'EPSG:4326',
   featureProjection: 'EPSG:3857',
 };
-const getDefaultFormat = () => new GeoJSON(formatOptions);
 
-const getDefaultMap = (target, featuresLayer) =>
-  new Map({
+function getDefaultFormat() {
+  return new GeoJSON(formatOptions);
+}
+
+function getDefaultMap(target, featuresLayer) {
+  return new Map({
     target,
     layers: [new TileLayer({ source: new OSMSource() }), featuresLayer],
     view: new View({ center: [0, 0], zoom: 2 }),
   });
+}
 
 export default function withMapControl({ getFormat, getMap } = {}) {
   return class MapControl extends React.Component {