Typescript: Add typing to function that uses "arguments" keyword

Question

is there a way to add typing information to this function? More specifically how do you add type information to `arguments`?

function gtag() {
  dataLayer.push(arguments);
}

Of course the error you get is Expected 0 arguments, but got 2. when trying to call e.g. gtag(1, 2). This code snippet comes from google analytics.
Thanks

Look at the arguments object and IArguments. The arguments object is basically an indexed object, so it doesn't hold any type information. In your sample code, it would be impossible for typescript to make sure arguments is properly typed. — user13258211
– user13258211, Commented Feb 24, 2021 at 13:17
So it seems arguments cannot be used in typescript, this is odd since TS is supposedly a superset of JS. Also see: stackoverflow.com/questions/29918324/… — Baki
– Baki, Commented Feb 25, 2021 at 9:24

Baki · Accepted Answer · 2021-02-25 11:15:51Z

0

This SO questions might have the answer for your case, however for our tsconfig / eslint settings this is something that allowed compilation:

// eslint-disable-next-line @typescript-eslint/no-unused-vars
function gtag(..._args: any[]) {
  // eslint-disable-next-line prefer-rest-params
  dataLayer.push(arguments)
}

Note the underscore in _args. As to answer the question itself it seems that what @mike-s said is true and you cannot add type information to arguments.

answered Feb 25, 2021 at 11:15

Baki

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