What Is A JavaScript Bundler?

What is a JavaScript bundler?

If you asked me 5 years ago what a JavaScript bundler is, I’d probably tell you it’s something people fight with for hours, just to get a simple web app set up 🤪 While this might have been closer to the truth in 2018, a lot has changed in JavaScript ecosystem until today.

If you’re starting your web development journey, or maybe have already dived into it, but are not really sure what JS bundlers are and what’s their role, you’re reading a proper piece of explanation 🙂

How To Fix Visual Studio Code IntelliSense Loading Infinitely

Continuing with weird errors you might encounter in JavaScript world, I have another one: Visual Studio Code IntelliSense loading infinitely 😀 Solution included, of course!

The symptoms of this issue are putting your mouse on something where you’d expect the IntelliSense guidelines, but instead you only see the “Loading…” text.

In this short article, I’m sharing the reason of this issue and my way of fixing it.

Typing API Responses With Zod

Have you ever needed to synchronize types in your frontend app with the backend API?

If you ever had an API action defined like that in your controller:

public record UserViewModel(Guid Id, string Name, string LastName, string Login,
bool IsActive, int LoyaltyPoints, AddressViewModel? Address = null);
// …
public List<UserViewModel> AllUsers()
var usersViewModels = TestDataGenerator.GetTestUsers();
return usersViewModels.OrderBy(uvm => uvm.Name).ToList();

and fetched this data using TypeScript in the following way:

getAllUsers = async (): Promise<UserViewModel[]> => {
const url = `${this.apiEndpoint}/AllUsers`;
const response = await fetch(url);
const users = (await response.json()) as UserViewModel[];
return users;

at some point, you probably also experienced the desynchronization of backend (C#, in our example) and frontend (TypeScript) types definitions. What if someone has changed the C# version of UserViewModel, but no one corrected its TypeScript’s equivalent?

Your TypeScript fetching code will tell nothing about that. There will be no error, even though the fetched data doesn’t match the expected UserViewModel type.

I’ll try to address this issue in this article 🙂 Let’s see how typing API responses with zod can help us here.

Write Test Progress To The Console With NUnit

NUnit: writing test progress to the console

I recently needed to write test progress to the console with NUnit. The task we want to solve here is basically the TODO part of this snippet:

public class MyTests
public void SampleTest()
// some operations here, like starting a server for tests in-memory…
// TODO: inform the 'user' (the one who runs the test) that the server is already running
while (true)
// keep it running on purpose (e.g. for E2E tests)

The title picture of this article shows the end result. If you want to know the solution, keep reading 🙂

How To Fix SqlException Database Is Not Currently Available On Azure (0x80131904)

I recently deployed my .NET 6 application to Microsoft Azure. The app uses NHibernate for working with SQL Server database. After some time, I started getting an unhandled exception when opening the application:

NHibernate.Exceptions.GenericADOException: could not load an entity: 
 ---> Microsoft.Data.SqlClient.SqlException (0x80131904): Database 'myappdb' on server 'myapp.database.windows.net' is not currently available.  Please retry the connection later.  If the problem persists, contact customer support, and provide them the session tracing ID of '{EB501CF2-2F21-4E28-9042-2B83EEE57B91}'.

The database is not currently available was very interesting to me. I struggled a bit with solving that, so if you want to know how I did it – continue reading 🙂