TypeScript + React: Children types are broken
Published on September 15, 2021 Stefan on Mastodon Reading time: 7 minutes More on TypeScript, React Update April 2022: With the update to React 18, a lot of those problems have been fixed. See this pull request for more details I currently work with a couple of newcomers to React and teach them both TypeScript and React to create apps. It’s fun, and for me who’s been using that for a while now, i
TypeScript without TypeScript -- JSDoc superpowers
Published on July 16, 2019 Stefan on Mastodon Reading time: 10 minutes More on TypeScript One way to think about TypeScript is as a thin layer around JavaScript that adds type annotations. Type annotations that make sure you don’t make any mistakes. The TypeScript team worked hard on making sure that type checking also works with regular JavaScript files. TypeScript’s compiler (tsc) as well as lan
TypeScript + React: Why I don't use React.FC
Published on July 30, 2020 Stefan on Mastodon Reading time: 10 minutes More on TypeScript, React, Preact Update: React types for version 18 changed a lot! If you encounter problems described in this article, make sure you update to the latest version! In my recent article on TypeScript and React component patterns I’ve stated that I don’t use the built-in type React.FC<> but rather be explicit wit
TypeScript + React: Component patterns
Published on July 28, 2020 Stefan on Mastodon Reading time: 10 minutes More on TypeScript, React, Preact This list is a collection of component patterns for React when working with TypeScript. See them as an extension to the TypeScript + React Guide that deals with overall concepts and types. This list has been heavily inspired by chantastic’s original React patterns list. Contrary to chantastic’s
TypeScript: Improving Object.keys
Published on June 17, 2020 Stefan on Mastodon Reading time: 7 minutes More on TypeScript Note: Be very careful with this technique. Better checkout my new approach. TypeScript’s predefined types in lib.d.ts are usually very well-typed and give tons of information on how to use built-in functionality as well as providing you with extra-type safety. Until they don’t. Consider the following example w
TypeScript: Variadic Tuple Types Preview
Published on June 19, 2020 Stefan on Mastodon Reading time: 12 minutes More on TypeScript TypeScript 4.0 is supposed to be released in August 2020, and one of the biggest changes in this release will be variadic tuple types. And even though his feature is hot of the press at the time of this writing, it’s worth checking out and see what we can do with it. Note that stuff here might be subject to c
void in JavaScript and TypeScript
Published on September 6, 2019 Stefan on Mastodon Reading time: 4 minutes More on TypeScript, JavaScript If you come from traditional, strongly typed languages you might be familiar with the concept of void: A type telling you that functions and methods return nothing when called. void exists in both JavaScript as an operator and in TypeScript as a primitive type. And in both worlds void works a l
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