Play with flow type checker

src/.babelrc

@@ -5,6 +5,8 @@
   "plugins": [
     ["transform-react-jsx", {
       "pragma": "JSX.createElement"
-    }]
+    }],
+    "syntax-flow",
+    "transform-flow-strip-types"
   ]
 }

src/assets/javascripts/components/Material/Nav/Blur.js

@@ -38,7 +38,7 @@ export default class Blur {
       : els
 
     /* Initialize index and page y-offset */
-    this.index_  = 0
+    this.index_ = 0
     this.offset_ = window.pageYOffset
 
     /* Necessary state to correctly reset the index */