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TypeScriptEngineering
TypeScript at scale: the patterns we still reach for in 2026
Branded types, exhaustive switches, and the boring discipline that keeps a 1M-line codebase pleasant.
Yuki Tanaka · Jan 18, 2026
We tried fancy. Boring won.
A quick tour of the patterns we keep using in large TypeScript codebases — and the ones we've quietly retired.