How to rewrite this saga so that f-I would be waiting for an answer?

Question

JavaScript

Hello everyone
There is a code that sends a request for data from Firebase and displays the results. I'm trying to migrate to Saga, but for some reason the Worker does not wait for the result. Here is the code:

function fetchStories() {
  fire.database().ref("stories").on('value', function(snap) {
    console.log("--- snap.val()", snap.val());
    return snap.val();
  });
};

function* fetchStoriesWorker() {
  try {
    const response = yield call(fetchStories);
    console.log("--- response", response)
    const dog = response.data.message;
    yield put({type: "API_CALL_SUCCESS", dog});
  } catch (error) {
    yield put({type: "API_CALL_FAILURE", error});
  }
}

Console Output:
As you can see from p-ta, fetchStoriesWorker() does not wait for fetchStories() to complete. Why?
How to wait for execution return snap.val();, and then write data to response?
Thanks