Moving to a class-based approach

src/util.ts

@@ -1,6 +1,22 @@
+declare var window;
+
+declare var Promise;
+
 export function get(obj, path) {
   for (var i=0, path = path.split('.'), len = path.length; i < len; i++) {
     obj = obj[path[i]];
   }
   return obj;
 };
+
+export const promisify = (pluginRef, methodName, successIndex, errorIndex) => {
+  return (...args) => {
+    return new Promise((resolve, reject) => {
+
+      args[successIndex] = resolve;
+      args[errorIndex] = reject;
+
+      get(window, pluginRef)[methodName].apply(this, args);
+    })
+  }
+}