Fix type error

package.json

@@ -128,7 +128,6 @@
     "react-beautiful-dnd": "10.1.1",
     "react-helmet": "5.2.1",
     "react-jsonschema-form": "^1.8.1",
-    "react-router": "4.3.1",
     "react-router-dom": "4.3.1",
     "react-router-hash-link": "1.2.1",
     "shortid": "2.2.14",

src/pages/AdminLoginPage/AdminLoginPage.tsx

@@ -91,7 +91,8 @@ class AdminLoginPage extends React.Component<AdminLoginPageProps, AdminLoginPage
     const { search } = location;
     const params = qs.parse(search);
     const { next } = params;
-    return next || DEFAULT_REDIRECT;
+    // TODO: Any change of next being string[]? We get type error on without the cast.
+    return next as string || DEFAULT_REDIRECT;
   }
 
   render() {