Firebase Firestore - Common function for queries but with different outcomes

I'll try to explain myself the best I can.

What I'm trying to do is to set a common function which I can pass the name of the collection and do something with that. The problem is that since it is an asynchronous request I can't just do var a = getFirestoreData(); so i'll have to use this piece of code over and over again:

const db = firebase.firestore();
myCollection = 'SomeRandomCollectionName';

//Repetitive piece of code
db.collection(myCollection).get().then((snapshot) => {
    var dataFromCollection = [];
    snapshot.docs.forEach(doc => {
        dataFromCollection.push(doc.data());
    })
    //TODO -> Do something with that data.
});

I want to be able to do different things with different collections with that same function (only one collection each time).

Basically what I want is something like a Utils class and use it for example:

Utils.getUsers("users");
Utils.getUsersAndUpdate("users", fieldToUpdate, dataToInsert);

Both of those functions use that same previous piece of code but with different continuity. How do I do this taking into account that it is an asynchronous request?

This is kind of a solution I made but it lacks the possibility to add parameters to the targetFunction since the amount of parameters each function takes may vary.

function getFromDatabaseToFunction(targetFunction, collection){
    db.collection(collection).get().then((snapshot) => {
       var dataToTargetFunction = [];
       snapshot.docs.forEach(doc => {
           dataToTargetFunction.push(doc.data());
       })
        targetFunction(dataToTargetFunction);
    })
}

P.S. This may likely be a duplicate but since I don't know what to search for I can't say for sure

from Firebase Firestore - Common function for queries but with different outcomes