What does the ‘satisfies’ operator do in TypeScript 4.9+?

Question

TypeScript Associate — Hard

What does the ‘satisfies’ operator do in TypeScript 4.9+?

Accepted Answer

The 'satisfies' operator in TypeScript 4.9+ validates that an expression matches a type without widening the inferred type, preserving narrower literal inference. This means it ensures that the type of the expression exactly matches the specified type without any implicit widening.