fix javascript black magic

1 files changed, 4 insertions, 0 deletions

diff --git a/packages/web-util/src/context/activity.ts b/packages/web-util/src/context/activity.ts
index 570729471..460c01096 100644
--- a/packages/web-util/src/context/activity.ts
+++ b/packages/web-util/src/context/activity.ts
@@ -22,6 +22,10 @@ export type Suscriber<Event> = (fn: Listener<Event>) => Unsuscriber;
 
 export class ActiviyTracker<Event> {
   private observers = new Array<Listener<Event>>();
+  constructor() {
+    this.notify = this.notify.bind(this)
+    this.subscribe = this.subscribe.bind(this)
+  }
   notify(data: Event) {
     this.observers.forEach((observer) => observer(data))
   }