refactor: client structure + editor preview logic

client/helpers/compatibility.js

@@ -0,0 +1,10 @@
+require('babel-polyfill')
+
+// =======================================
+// Fetch polyfill
+// =======================================
+// Requirement: Safari 9 and below, IE 11 and below
+
+if (!window.fetch) {
+  require('whatwg-fetch')
+}