Created cli command. Updated tracker script.

lib/web.js

@@ -8,3 +8,13 @@ export const post = (url, params) =>
     },
     body: JSON.stringify(params),
   }).then(res => (res.status === 200 ? res.json() : null));
+
+export const hook = (_this, method, callback) => {
+  const orig = _this[method];
+
+  return (...args) => {
+    callback.apply(null, args);
+
+    return orig.apply(_this, args);
+  };
+};