UserCredential | implement user account policies | Authentication library

I am trying to get the user details after the user signs with google using firebase in flutter. here is code I have and it successfully signs the user in, but when I access the details it gives me this message when I hover over the red line - Error - The property 'username' can't be unconditionally accessed because the receiver can be 'null'

I have followed FedEx developer guide but still can not create FedEx shipment with FEDEX_ONE_RATE. This is the request that I have tried:

I am working on a application with flutter and firebase and i am working on the auth for user and i want tu use the function uid but it's dont work, why ?

I have a ValueNotifier class that performs some logic, then alerts all listeners when done. The problem I have is how to alert the listeners when there is an error in the processing so that an appropriate message can be displayed in the UI.

Here is the ValueNotier class:

I've trying to use Mailkit and OAuth to read a user's Gmail inbox, and have followed the sample code found in the Mailkit FAQ. For the record, here is the code I'm using...

Note that I'm currently storing the token in a file in the site's content root, just until I get this working. After that, I'll be implementing an Entity Framework IDataStore, so please don't be concerned about the security issue of the code shown here

Some context: I have a PowerShell script that gets information about users and their licenses on Azure, and then saves that information to CSV file. It works locally. My goal is to have this script automatically run on Azure (I'm trying to do it in an Azure Function App) once a month, and then have the created CSV file be emailed to a specified email. However all I want to figure out right now is how to get the list of users so that the script can at least just run without errors.

I have very little experience with PowerShell and Azure Function Apps, so I'm stuck on a few errors I'm getting. I have spent the last few days troubleshooting to no luck.

Here is the beginning of the script that I can run from my local PowerShell:

[core/no-app] No Firebase App '[DEFAULT]' has been created - call Firebase.initializeApp()

Where create call Firebase.initializeApp() ?

what should I change in my code? Is there any way to do it? In case you want to see the code please let me know I will update more.

auth.dart

I got the following problem. When user register he will be on a page, where I show a message like check your Email account. And when user check his account and confirm his mail he automatically get to homepage. So far so good. But when user press register button an get mail and reload the page he get also inside homepage without confirm his mail. I trie this

I have a simple Create-User-Component that I want to unit test.

The component depends on an Auth Service with a few methods, like 'login, logout' etc.

The auth service imports both AngularFireAuth and AngularFireStore. It is the service that handles database interaction.

The problem is that I can't run my tests because I get a null injector error (shown in full bellow).

I want to mock out any database interaction, so that I can test the component in isolation.

I have tried various approaches, spying on the auth service, mocking its methods and even mocking the firestore dependency, but nothing gives me any progress on the particular error I am facing.

In the version of the code bellow, I inject a stubbed version of the auth service which is supposed to console log whenever one of its methods are called, but no logging occurs.

Why is this error coming and how do I mock out my firebase dependencies correctly so that I can test my components?

Minimalized samples of my code

The component