JSDoc as an alternative TypeScript syntax
As web development has embraced static typing during the past decade, TypeScript has become the default language of choice. I think this is great—I love working with TypeScript! But what if you can't use TypeScript? You may encounter circumstances where you need to work in plain JavaScript, be it tooling constraints or a team member who does not like static typing. Under these circumstances, look
TypeScript and the dawn of gradual types
The FullScreenMario project burned brightly for a few short weeks in October 2013 after Boing Boing lauded it as “a pretty impressive example of what HTML5, in-browser functionality can do.” A few days later, it went viral on Reddit and by November, attention turned to scrutiny, and Nintendo took the project down with a DMCA request. Josh Goldberg speaks of his former project with a bit of pride—i
All JavaScript and TypeScript Features of the last 3 years
TypeScript as envisioned by Stable DiffusionThis article goes through almost all of the changes of the last 3 years (and some from earlier) in JavaScript / ECMAScript and TypeScript . Not all of the following features will be relevant to you or even practical, but they should instead serve to show what’s possible and to deepen your understanding of these languages. There are a lot of TypeScript fe
Making sense of TypeScript using set theory
I've been working with TypeScript for a long long time. I think I'm not too bad at it. However, to my despair, some low-level behaviors still confuse me: Why does 0 | 1 extends 0 ? true : false evaluate to false? I'm very ashamed, but I sometimes confuse "subtype" and "supertype". Which is which? While we're at it, what are type "narrowing" and "widening", and how do they relate to sub/supertypes?
TypeScript: Array.includes on narrow types
Published on July 6, 2021 Stefan on Mastodon Reading time: 10 minutes More on TypeScript, JavaScript The Array.prototype.includes function allows searching for a value within an array. If this value is present, the function returns true! How handy! Of course, TypeScript has proper typings for this JavaScript functionality. However, in certain cases, the typings can bite a little. The reason? It’s
TypeScript Function Syntaxes
TypeScript Function SyntaxesFebruary 25th, 2021 — 15 min read In JavaScript itself, there are lots of ways to write functions. Add TypeScript to the mix and all of a sudden it's a lot to think about. So with the help of some friends, I've put together this list of various function forms you'll typically need/run into with simple examples. Keep in mind that there are TONS of combinations of differe
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Index Signatures in TypeScript
TypeScript Enums I Want to Actually Use
Effective TypeScript › The Seven Sources of Unsoundness in TypeScript
Really Advanced Typescript Types