Throw error instead

packages/fether-react/src/RequireHealthOverlay/RequireHealthOverlay.js

@@ -20,7 +20,7 @@ function statusMatches (status, require) {
     case 'sync':
       return status === STATUS.GOOD;
     default:
-      return false;
+      throw new Error(`Status '${status}' must be one of 'connected|sync'.`);
   }
 }