Lmst

#satisfies

TIL: `satisfies` is my favorite TypeScript keyword

https://sjer.red/blog/2024-12-21/

#HackerNews #TIL #TypeScript #satisfies #keyword #programming #developer #community

Amazing? Stupid? 🤔 🤪

$const sayOn = ((action) => { if (action === 'go') { return 'bye' } return 'hi' }) satisfies (action: 'go' | 'come') => string const said = sayOn('go') // ^? const said: "bye" | "hi"$

Finalised my DEV article on exhaustiveness checking in #Typescript with #satisfies https://dev.to/cefn/typescript-satisfies-never-exhaustiveness-checking-in-typescript-49-58fh - keen for feedback.

#typescript 4.9 is only a few days old and I already can't image it without the #satisfies operator anymore lol. If you need help to understand it, watch this https://youtu.be/Danki1DyiuI?t=247

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