TypeScript is a thing which exists for the sole purpose of adding type checking to JavaScript, and nothing more. In particular, unlike most historic statically-typed languages, TypeScript gains no performance advantage from types; it literally compiles down to JavaScript before running. The only possible advantage is developer productivity stemming from type checking and other tooling it enables.

TypeScript is extremely popular.

Obviously there is some subjectivity here. Different people can have different opinions. Different kinds of projects may call for different approaches. But it's hard to argue that all those developers using TypeScript chose to do so without getting any benefit.