typescript fixed string value with any string value

Question

I am trying to create a method which parameter has fixed string value types but at the same time i want user to also provide value other than fixed string values.

function create(options: "A" | "B" ){

}


create("C");

Here when user is passing "C" value, typescript is throwing error. This can be fixed by casting "C" to any, but i don't want user to do anything but my method should take care of it.

Consider the options contains 100 of string values, so it is helping users to get those value in intillisense which will help users to don't remember it and use it.

Can i do anything from methods ?

Seems like what you want is function create(options: string) because when you say function should accept "A" and "B" and any other string value, you want any string value as the parameter type because that will include "A" and "B" as well. — Nishant
– Nishant, Commented Jun 22, 2021 at 5:27
May I ask what is the scenario you may need a logic like that? — Abdullah Khaled
– Abdullah Khaled, Commented Jun 22, 2021 at 6:27

captain-yossarian from Ukraine · Accepted Answer · 2021-06-22 06:43:30Z

1

I think it is better to overload your function:

function create(options: "A"): void
function create(options: "B"): void
function create(options: string): void
function create(options: string) { }


create()

IDE will be able to pick up allowed arguments along with string type:

edited Jun 22, 2021 at 6:43

answered Jun 22, 2021 at 6:24

captain-yossarian from Ukraine

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