Can a typescript parameter be annotated as const?

Question

If I do not want the value of a parameter change within a function scope, is there any way to annotate that with Typescript?

I've tried:

function walk(const fileName: string): string[] {
// -----------^
}

But it does not work.

Answer 1

There is no way to do it right now, and it may not be, as it is not possible in ES6 either:

How to make function parameter constant in JavaScript?

This workaround doesn't work for TypeScript anyway.