Proč my cloud funkce dávat chybu (CloudFirestore s ForOf Smyčky)?

Moje funkce getDocuments() v souhrnu spočívá v tom, že jsem předat některé parametry v poli (jako cesta, název dokumentu, pokud chci, aby část po částech) a na základě toho pole návrat na obsah každého dokumentu, přes smyčku (ForOf), funkce dělám to více než nic, aby mě zachránil příliš mnoho řádků kódu, problém je, že to vždy hází mi chybu, že nevím, co to je.

Můžete mi pomoci? Prosím

Cloud funkce

export const employees = functions.https.onRequest((request, response) => {
corsHandler(request, response, async () => {
    return await security.securityLayer(
        { _definedMethod: "GET", userValue: request.method },
        { _definedType: true, _definedLevel: [4], _definedSeconds: 12, userToken: request.header("_token") },
        { required: false },
        { required: false }
    ).then(async (answer) => {
        if (answer.status === 400 || answer.status === 401) {
            return response.status(answer.status).send(answer);
        }

        return await security.getDocuments([
            { collection: "Core/", documentName: "Centers", options: { idReturn: "centros", nestedProperties: [] } },
            {
                collection: "Core/", documentName: "Employees", options: {
                    idReturn: "personal",
                    nestedProperties: [
                          { idReturn: "employees", name: "employee" },
                          { idReturn: "submanager", name: "submanager" },
                          { idReturn: "manager", name: "manager" }
                     ],
                },
            },
        ], SPECIAL_CODE).then((documents) => response.status(documents.status).send(documents))
            .catch(() => response.status(500).send(security.error500(SPECIAL_CODE, 2)));
    }).catch(() => response.status(500).send(security.error500("SPECIAL_CODE", 1)));
});
});

asynchronní funkce

export async function getDocuments(
documents: {
    collection: string,
    documentName: string,
    options: {
        idReturn: string,
        nestedProperties: {
            idReturn: string,
            name: string
        }[]
    }
}[],
code: string):
Promise<{ status: 201, code: string, subcode: number, devDescription: string, data: any }> {
const data: any = {};
const response: { devDescription: string, subcode: number } = { devDescription: "The document was found and retrieved successfully.", subcode: 1 };

if (documents.length > 1) {
    response.devDescription = "Documents were found and obtained successfully.";
    response.subcode = 2;
}

for (const iterator of documents) {
    const docRef = { path: iterator.collection, name: iterator.documentName };
    const options = { id: iterator.options.idReturn, nestedProperties: iterator.options.nestedProperties };
    const doc = await database.collection(docRef.path).doc(docRef.name).get();

    if (!doc.exists) {
        data[options.id] = "The document " + docRef.name + " does not exist in the specified path: " + docRef.path;

        if (documents.length === 1) {
            response.devDescription = "The document was not found. Check the DATA for more information.";
            response.subcode = 3;
        } else {
            response.devDescription = "One, several or all documents were not found. Check the DATA for more information.";
            response.subcode = 3;
        }
    } else {
        const docData: any = doc.data();
        if (options.nestedProperties.length === 0) {
            data[options.id] = docData;
        } else {
            for (const nested of options.nestedProperties) {
                data[options.id][nested.idReturn] = _.get(docData, nested.name);
            }
        }
    }
}

return { status: 201, code: code, subcode: response.subcode, devDescription: response.devDescription, data: data };
}