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Accessing Firestore document data with JavaScript

Hi, I've written some code that creates a new Firestore document from user input, then takes that Firestore doc, parses it into a JS object and adds it to an array called 'stock' on a stock object. When Firestore adds a new doc, it automatically generates a doc id accessed via doc.data.id. In the code I've written below, I'm not sure how to access the newly created Firestore doc in order to get its id, since the doc is created dynamically. All of the other parts of my code seem to work perfectly. Thanks!

const addItemsForm = document.querySelector("#addItemsForm");
const firestoreStock = db.collection('stock');

 * Listens for submit on `#addItemsForm`;
 * Adds new document to Firestore with form input data;
 * Calls addItemToStock() on stock object using Firestore document data.
addItemsForm.addEventListener('submit', (e) => {
    var itemNo = addItemsForm.itemNo.value;
    var storageRef = storage.ref('stockImages/' + itemNo + '.jpg');

            name: addItemsForm.name.value,
            description: addItemsForm.description.value,
            itemNo: addItemsForm.itemNo.value,
            size: addItemsForm.size.value,
            price: addItemsForm.price.value,
            imageURL: url
        }).then(function() {
            console.log('New doc successfully added to Firestore');
            firestoreStock./*doc data id of doc just added to Firestore*/.get().then(function(doc){
                if (doc.exists) {
                    console.log('new item object successfully added to stock array');
                } else {
                    console.log('error with storageRef - document does not exist')
        }).catch(function(error) {
            console.log('Error getting document:', error);