TypeScript patterns that prevent real bugs — discriminated unions, branded types, parse-don't-validate, and the type-level idioms that turn a refactor from a leap of faith into a compile-time confirmation.
2 articles · updated regularly
UserId, OrderId, Email — all of them strings to the compiler, all of them disasters when accidentally swapped. Branded types are five lines of code that prevent the whole class.
Optional fields are how TypeScript codebases drift into nullable-everywhere chaos. Discriminated unions are how they get rescued.