Author: Martin Aarhus Gregersen

In Typescript, exceptions can be a bit weird. This is especially true if you’re writing library code or a VSCode plugin. Because almost surely you’ll want to output nice and custom error messages to the end user. Typescript doesn’t allow for a try/catch block to catch type errors, like it would for runtime errors. So […]

Few programmers start their journey with Typescript. There’s a wide variety of languages we could start with and while it isn’t all that important, a common denominator despite how we learn the web, is Javascript. Most developers encounter javascript at some point or another, as part of making their websites interactive, adding a little bit […]

This post was updated in May 2024, to include a new contender with fewer tools as a potential winner as my personal preference. For Javascript, we are lucky to have an extremely popular library titled nodemon. For Typescript, we’re not quite as lucky. But we do have a few options! In this short article, I’ll […]

Functions are the bread and butter of Javascript. It leans more strongly into a functional programming paradigm than any modern language today. But functions can be weird! Then, on top of that, let’s add the added layer of complexity that is Typescript. How do we start defining types for weird functions? What if I wanted […]

The Partial keyword in Typescript has many uses, but when is actually a good use case for using it? Well I’ve got a few quick ones so let’s dive in! Extending types to reduce maintenance Familiar with the DTO pattern? No? If not, this section is definitely for you! Popularized by Java – at least […]

With the most recent Typescript version as of today – 4.9 – among a bunch of features (that I’ll make sure to cover in other posts) we are getting access to the satisfies keyword and that is a big deal! Bigger than you think, at least. At its core level the purpose of the satisfies […]

While Typescript has a high rate of adoption and it is generally very well-regarded in the community, there are still many developers that – despite Typescripts many advantages – still prefer Javascript. I myself had a preference for Javascript well into 2021, before I finally succumbed to the allures of Typescript, and decided to give […]

Builder classes are an interesting pattern. Originating from the OOP world, they seem to have found a good place in the Javascript (and Typescript) ecosystem. Builders can be incredibly helpful in assisting us in creating complex objects, often step-by-step. They are at their best in code-bases where we often need similar, yet different, complex objects […]

Nothing is more frustrating than having the Typescript compiler complain about something that obviously worked fine in Javascript, what the hell man!? However, as frustrating as it seems, Typescript is actually trying to protect us from… Well, ourselves! Sometimes we know more than Typescript and we can safely ignore such warnings, for example by declaring […]

Ever find yourself consuming a third party library, or API, with Typescript? Ever been in a situation where whatever you’re working with, isn’t exactly strongly typed, entirely neglecting one of the advantages of Typescript? Me too! But fret not, there are things we can do to ensure type safety even when working with libraries, objects […]