Types aren’t just documentation — they’re contracts the compiler enforces. Want to be sure your utility types do exactly what you expect?
- 🔍 Use type-level assertions to verify correctness
- 🔄 Test for exact matches and meaningful differences
- 📌 Catch edge cases before they hit runtime
- 🧠 Build confidence in your type transforms, even the tricky ones
- 📁 Keep type tests side-by-side for clear red flags in your IDE
When your types test themselves, refactors become less risky and more fun.
📎 Full article → https://javascript.plainenglish.io/type-safety-under-control-reliable-utility-type-checks-in-2025-1ea875dae8af
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