How to delete document collection and all nested data from auth.user.onDelete trigger - firebase

Question

Currently, the logic for deleting user data is the following:
import * as admin from 'firebase-admin';
import * as functions from 'firebase-functions';
const firestore_tools = require('firebase-tools');
admin.initializeApp();
const Auth = admin.auth();
const UsersCollection = admin.firestore().collection(`users`);
exports.deleteUserDocuments = functions.auth.user().onDelete((user) => {
const userID = user.uid;
UsersCollection.doc(userID)
.delete({})
.catch(error => {
return error
});
});
But since the user document record contains nested collections that contain other documents and collections they are still preserved due to the fact:
When you delete a document, Cloud Firestore does not automatically delete the documents within its sub-collections
I've researched a bit and found a documentation on how to create a callable function:
https://firebase.google.com/docs/firestore/solutions/delete-collections
But I wonder is it possible to have this logic instead executed from the auth.user.onDelete trigger?
Update with the Solution
const firestore_tools = require('firebase-tools');
exports.deleteUserDocuments = functions.auth.user().onDelete((user) => {
const userID = user.uid;
const project = process.env.GCLOUD_PROJECT;
const token = functions.config().ci_token;
const path = `/users/${userID}`;
console.log(`User ${userID} has requested to delete path ${path}`);
return firestore_tools.firestore
.delete(path, {
project,
token,
recursive: true,
yes: true,
})
.then(() => {
console.log(`User data with ${userID} was deleted`);
})
});

Answer 1

You can run whatever code you want in whatever trigger you want. The type of the trigger doesn't have any bearing on the type of code you can run.