Recursively get a list of users [Firebase + Saga] - firebase

Question

As Firebase’s Firestore only allows 10 items at each query. I need to recursively query users in batches of 10 users.
This is what I've done referencing from Composing Sagas
, but users returns a list of undefined. What have I done wrong? Or is there a better (more efficient) way to query a list of users from Firestore? Note: I have to use Redux-Saga.
export function* watchGetListUsersByUids() {
yield takeEvery(USERS_GET_USERS_BY_UIDS, getListUsersByUids);
}
const getListUsersByUidsAsync = async (list_uid, set) => {
var get_uids = list_uid.slice(set * 10, (set + 1) * 10);
console.log("get_uids", get_uids);
await firestore
.collection("users")
.where("uid", "in", get_uids)
.get()
.then((data) => data.docs.map((doc) => doc.data()))
.catch((error) => error);
};
function* getListUsersByUids({ payload }) {
const { uids } = payload;
var numSet = parseInt(uids.length / 10);
var apiCalls = [];
for (var i = 0; i <= numSet; i++) {
apiCalls.push(call(getListUsersByUidsAsync, uids, i));
}
if (apiCalls.length) {
try {
const users = yield all(apiCalls);
console.log(users); // <-- [undefined, undefined, ...]
} catch (error) {
console.log(error);
}
}
}