Re: Translating complete functions to Vim9

> Is there a way to turn a completion function (:h complete-functions)
> into Vim9 script?
>
> The issue is that such functions are called twice, and they are expected
> to return values of different types in each call.

You can use the return type "any".

I know in typescript it is possible to combine two types, e.g. you can
use "string | number". But not many other languages use this. I am not
convinced adding the combined type to Vim 9 script is a good choice.

For newly added builtin functions we will avoid mixing types, both for
the arguments and for the returned value. But several of the existing
functions do allow for different types, since they were designed for
runtime type checking.

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