TypeScript to infer type arguments in interface implementation class

Question

It will complain that type of arg is any

interface Foo { 
  foo(arg: string): void 
}

class FooImpl implements Foo {
  foo(arg) { console.log(arg) }
}

I can of course specify that it's string but it's repetitive.

Maybe there's a way to tune TypeScript to make it infer that it's string automatically?

Answer 1

Maybe there's a way to tune TypeScript to make it infer that it's string automatically

No. Here is the relevant TypeScript issue with reasons why its not there: https://github.com/Microsoft/TypeScript/issues/1373