https://www.freecodecamp.org/learn/front-end-libraries/redux/register-a-store-listener

JavaScript
2

Okay, you’ve written your callback function:

const callback = () => {
  count++;
}

But you still have to subscribe it to the store. To do it you can use store.subscribe().

For example the code below would log “Hello” to the console every time an action is dispatched against the store:

store.subscribe(() => {
  console.log("Hello");
}