Posts
Types as comments for plain JavaScript
Today we’re looking into the potential future of JavaScript by reading up on the types as comments proposal that seeks to introduce type information as part of the core JavaScript language.
Type-Aware Rules for ESLint
In a previous article my colleague Tobias Walle already discussed how Static code analysis in Node.js can be used to improve the quality of your code, specifically with ESLint. Most TypeScript developers are probably already aware of the eslint-plugin which provides a plethora of additional rules specifically for TypeScript.
Deno - adopt or wait?
Deno is 4 years old now and is slowly maturing. Among other things, the Node alternative has become known for the really good security principles. Deno is running in a kind of sandbox, just like the browser sandbox. Many developers really like the idea. But how mature is Deno really? Is the effort of changing your runtime worth it if you are already familiar with Node? What’s still missing from the young competitor? Architecture expert Sebastian Springer answers these questions:
Angular Changedetection Playground
Some colleagues who have not yet dealt much with the topic of ChangeDetection in Angular may find it difficult to imagine what the
difference between the default and the OnPush approach is.
Avoid canceled requests when using RxJS combineLatest()
If you work with Angular in your project, then you can’t avoid the reactive framework RxJS. This offers a lot of of operators. While some are rarely used, combinedLatest is certainly one of the great favorites of any Angular developer. It is used to combine multiple observable streams. It emits a value as soon as all incoming observables emit at least one value.
Handling Conditional Classes in Angular
How do you handle conditional classes at a dom element in Angular? There are two main options: class-bindings and ngclass. But which one is better?
I tested both to get a definite answer.
Writing CLI tools with TypeScript
There are quite a couple of technology options when it comes to writing a command-line interface (CLI) tool. Most modern languages at the very least provide some kind of out-of-the-box support for command-line argument parsing. In addition, the ecosystems of modern languages also typically contain at least one mature and feature-rich CLI library.
RxJS Best Practices and an Idea
There are some best practices in RxJS for several regular use cases. First of all I’ll share my personal recommandations from my long time project, before we go into an idea how to improve them.
Static code analysis in Node.js
JavaScript is a very powerful language. This has a lot of advantages, but it can also decrease the readability of your code if misused.
Best Practices FP in TypeScript
Some of us have a background in functional programming and are now moving into a TypeScript environment.
Typesafe Mocks in TypeScript
Mocks are great, even if they represent the same API as the real implementation. In this article we use global mocks for implementations and won’t mock them multiple times.
Potential Memory Leaks in RxJS
Why calling takeUntil() with only subject.next() leads to a new memory leak and how to fix it
TypeScript Error Handling
TypeScript offers many ways to handle HTTP errors. I will show you a way that works for me. In my current project we are building a server-side NestJS backend for a web application, which is the use case we’ll look into now.
Why you can’t trust TypeScript Interfaces
TypeScript usually does a pretty good job in detecting bugs already at compile time. However, sometimes it can also introduce problems that developers wouldn’t even think about, especially if they are used to naturally typed languages.
Opaque Types in TypeScript
TypeScript already gives us a lot in terms of type safety - many types of bugs that plagued us in the days of vanilla JavaScript are a thing of the past. But we can go even further by leveraging the type system in clever ways.