Zod v4 Zod v4, the latest iteration of the TypeScript-first schema validation library, introduces a suite of enhancements aimed at improving performance, developer experience, and flexibility. After over a year of development, Zod v4 is now stable and available for use

Zod v4

Zod v4, the latest iteration of the TypeScript-first schema validation library, introduces a suite of enhancements aimed at improving performance, ...

TypeScript predicates At first glance, a function like isString seems harmless. It tells TypeScript: "If this function returns true, you can trust that the input is a string." But what TypeScript doesn’t do is verify the logic inside that function. You, the developer, are now responsible for proving that assertion is correct. TypeScript simply takes your word for it

TypeScript Lies? The Hidden Risks of Using Predicates!

At first glance, a function like isString seems harmless. It tells TypeScript: "If this function returns true, you can trust that the input is a st...

TypeScript Lies? The Hidden Risks of Using Predicates! At first glance, a function like isString seems harmless. It tells TypeScript: "If this function returns true, you can trust that the input is a string." But what TypeScript doesn’t do is verify the logic inside that function. You, the developer, are now responsible for proving that assertion is correct. TypeScript simply takes your word for it

TypeScript Lies? The Hidden Risks of Using Predicates!

At first glance, a function like isString seems harmless. It tells TypeScript: "If this function returns true, you can trust that the input is a st...