diff --git a/frontend/src/js/util/observable.js b/frontend/src/js/util/observable.js
new file mode 100644
index 000000000..6f2484935
--- /dev/null
+++ b/frontend/src/js/util/observable.js
@@ -0,0 +1,13 @@
+export default class Observable {
+  Observable() {
+    this.subscribers = [];
+  }
+
+  subscribe(fn) {
+    this.subscribers.push(fn);
+  }
+
+  fire(params) {
+    this.subscribers.forEach((fn) => fn(params));
+  }
+}