Every few months I find a TypeScript pattern in someone's open-source repo that I instantly bring back to my own code. It's the cheapest form of getting better — read code that's been read by hundreds of contributors and find the patterns that survived.
Here are three I keep reaching for in 2026.
1. satisfies for catch-typos-at-compile-time configs
You know the routine — a config object that holds, say, all your route paths, or all your event names. You want autocomplete when you reference one, but you also want TS to scream if you fat-finger a key.
The old way:
