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Posts tagged “type narrowing”

2 posts found

TypeScript `asserts` and Type Predicates in 2026: Writing Guards That Actually Narrow Correctly

TypeScript `asserts` and Type Predicates in 2026: Writing Guards That Actually Narrow Correctly

July 31, 2026

Most TypeScript runtime validation fails because developers misunderstand when to use type predicates versus assertion functions. Learn the patterns that actually narrow types correctly in production codebases.

typescripttype guardstype predicates+2
TypeScript `never` in Practice: Exhaustive Checks, Impossible States, and Narrowing Dead Code

TypeScript `never` in Practice: Exhaustive Checks, Impossible States, and Narrowing Dead Code

July 28, 2026

Master the never type for exhaustive checks, impossible state elimination, and compile-time guarantees. Learn practical patterns that catch bugs before they reach production.

typescripttype-safetynever-type+2