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.babelrc

@@ -6,5 +6,6 @@
       }
     }],
     "@babel/react"
-  ]
+  ],
+  "plugins": ["@babel/plugin-proposal-class-properties"]
 }

example/reference/src/Sidebar.jsx

@@ -15,11 +15,11 @@ function Doc({ doc }) {
 
 Doc.propTypes = {
   doc: PropTypes.shape({
-    title: PropTypes.string.isRequired,
     api: PropTypes.shape({
       method: PropTypes.string.isRequired,
     }),
     slug: PropTypes.string.isRequired,
+    title: PropTypes.string.isRequired,
   }).isRequired,
 };