Add choices option

[hosseinmd]

I want to define a type like this:

      aFlag: {
        type: "global" | "local",
        default: "global",
      },

How this possible? or if that is not possible. could you implement it?

[sindresorhus]

What are you trying to do? First, those type values are not valid, even without the "or". Second, how would it be able to decide which type to use?

[hosseinmd]

Imagine I have an argument which gets two values "local" or "global".

[sindresorhus]

You didn't answer all my questions.

[hosseinmd]

how would it be able to decide which type to use?

I don't familiar with meow project but on Typescript, we could do it like this:

function example<T>(type: T): T extends ReadonlyArray<infer K> ? K : T {
  return "" as any;
}

example(["foo", "bar"] as const) === "foo";
// example return 'foo' | 'bar

[sindresorhus]

Ok, I get it now. The type should still be a string though. What you want is something like .choices() in Yargs: http://yargs.js.org/docs/#choices Basically, specify a list of the possible values to the flag.

That's not supported today, but I'll mark this as a feature request.

[sindresorhus]

If anyone wants to work on this, see the initial attempt in #183 (Also make sure you intend to finish it!)