Is there ArgumentsType like ReturnType in Typescript?

Question

ReturnType extracts return type of a function.

Is there a way to define ArgumentsType that extracts parameter types of a

Answer 1

I'm sure there are many uses for Parameters but I wanted a way to provide proxy method to the same method on a private member and it seemed a perfect fit.

eg. I want to have the following, such that if the authService.login signature changes I don't have to modify my proxy - just whatever is calling it.

login(username: string, password: string) { this.authService.login(username, password); }

With Parameters you can do the following

login = (...params: Parameters) => this.authService.login(...params);

Of course the benefit is that if you have complex parameters it'll just take care of itself nicely - (probably wouldn't recommend this for just two strings!)

It took me a couple attempts to figure out that I needed ... on both occurrences of params.