Firebase-Firestore | This is a simple CRUD operation with Firestore | RecyclerView library

I have added android:exported="true" to my only activity in manifest but still getting below error after updating compile sdk and target sdk version to 31.I also tried rebuilding the project , invalidating cache and restart but that didn't helped

Error- Apps targeting Android 12 and higher are required to specify an explicit value for android:exported when the corresponding component has an intent filter defined. See https://developer.android.com/guide/topics/manifest/activity-element#exported for details.

I'm new to unit testing in general. I'm trying to test simple method from my DataRepository.

Following this link but seems deprecated: https://utkarshkore.medium.com/writing-unit-tests-in-flutter-with-firebase-firestore-72f99be85737

currently i am having this error:

I greated a very simple angular app (only shows a home page, and have attempted to deploy to Firebase hosting as shown in the several videos on the subject. It all seems to be working normally when i run it locally with ng serve, and I get output from firebase deploy that looks like this:

I am working on a weird kind of site where I only need to send forms to firestore and save pdf files to firestorage. Not even running any server-side code, just html and JS on the final client. My organization will only give an apache server path to run html, CSS and JS. Later I'll need to read but I'm the only user with read access so it's not a big deal because I will run that locally on my node.js CLI.

But I am looking forward to make my code as safe and efficient as possible even tho I have no idea what I'm doing 60% of the time.

Reading the docs and code online I realized that I am not doing unsubscribe() when I do my onAuthStateChanged(). By searching about memory leaks on JS I found a guy saying that if I meant to keep something live up in memory then I shouldn't unsubscribe from it. But as I said, I have no idea what I am doing.

Here is some of my .js and my login.html I am worried about 4 things, here I go:

1. should I unsubscribe() after my sign-in-out onAuthStateChanged ends? if so, where?
2. is it ok to set all this code inside window.onload ?
3. Should I split this code into modules so I can re-use the initializeApp() and other repetitive code or it is not recommendable since I am using CDN to import the firebase modules instead of using the import sentence.
4. Am I supposed to do the initializeApp() on every single one of my html pages? or doing it once on the login and forcing the user to login via vanilla JS will be the way to go?

...

I'm trying to create a function to add documents to firestore. At the moment this function could be called two different ways. 1) Adding a user to a collection called 'Users'. 2) adding a site to a collection called 'Sites'.

This function should take the following parameters:

1. The name of the collection (required)

2. The users uid (make this optional)

3. An object with the data for a site (make this optional)

I'm also trying to utilize JS modules to keep my code better organised. At the moment my folder looks something like this:

The firebase extension for a distributed counter can be directly installed for the cloud and works just fine. To develop new features for an app I need to do this on the emulator to not interrupt the running server.

As the firebase extensions simply are cloud Functions*, I thought about implementing the cloud function in my emulator by getting the source code from the extension itself. This worked fine for other extentions so far...

When implementing the javaScript version that i get the following error:

function ignored because the unknown emulator does not exist or is not running.

This problem can be fixed by rewriting the export line of the index.jsfunctions, but is wont provide the expected functionality of the extension anyhow:

I'm receving the below error in API 31 devices during Firebase Auth UI library(Only Phone number credential),

I searched for a long time on the Internet how to solve this error but did not find it.I tried to do a search as written here, but I did not find anything, maybe because I do not understand how to use it. What is this error? How to solve it? Help me pls. P.S. Any necessary files or additional information I can add.

Duplicate class androidx.lifecycle.DefaultLifecycleObserver found in modules lifecycle-common-2.4.0.jar (androidx.lifecycle:lifecycle-common:2.4.0) and lifecycle-common-java8-2.3.0.jar (androidx.lifecycle:lifecycle-common-java8:2.3.0)