Use static propTypes class property

src/containers/EntryPage.js

@@ -15,6 +15,23 @@ import EntryEditor from '../components/EntryEditor';
 import EntryPageHOC from './editorialWorkflow/EntryPageHOC';
 
 class EntryPage extends React.Component {
+  static propTypes = {
+    addMedia: PropTypes.func.isRequired,
+    boundGetMedia: PropTypes.func.isRequired,
+    changeDraft: PropTypes.func.isRequired,
+    collection: ImmutablePropTypes.map.isRequired,
+    createDraftFromEntry: PropTypes.func.isRequired,
+    createEmptyDraft: PropTypes.func.isRequired,
+    discardDraft: PropTypes.func.isRequired,
+    entry: ImmutablePropTypes.map,
+    entryDraft: ImmutablePropTypes.map.isRequired,
+    loadEntry: PropTypes.func.isRequired,
+    persistEntry: PropTypes.func.isRequired,
+    removeMedia: PropTypes.func.isRequired,
+    slug: PropTypes.string,
+    newEntry: PropTypes.bool.isRequired,
+  };
+
   componentDidMount() {
     if (!this.props.newEntry) {
       this.props.loadEntry(this.props.collection, this.props.slug);
@@ -69,23 +86,6 @@ class EntryPage extends React.Component {
   }
 }
 
-EntryPage.propTypes = {
-  addMedia: PropTypes.func.isRequired,
-  boundGetMedia: PropTypes.func.isRequired,
-  changeDraft: PropTypes.func.isRequired,
-  collection: ImmutablePropTypes.map.isRequired,
-  createDraftFromEntry: PropTypes.func.isRequired,
-  createEmptyDraft: PropTypes.func.isRequired,
-  discardDraft: PropTypes.func.isRequired,
-  entry: ImmutablePropTypes.map,
-  entryDraft: ImmutablePropTypes.map.isRequired,
-  loadEntry: PropTypes.func.isRequired,
-  persistEntry: PropTypes.func.isRequired,
-  removeMedia: PropTypes.func.isRequired,
-  slug: PropTypes.string,
-  newEntry: PropTypes.bool.isRequired,
-};
-
 function mapStateToProps(state, ownProps) {
   const { collections, entryDraft } = state;
   const collection = collections.get(ownProps.params.name);