extract keys of type (key type, not its field type)

[millsp]

extract keys of type (key type, not its field type)

[millsp]

@regevbr Yes, I also found myself needing it a few times

[millsp]

@regevbr , I currently achieve this by doing [keys] & [type]. For example:

('1' | 1) & string // '1'

I rather raise awareness of such techniques instead of writing such types.

So I am marking this as a question :)

[regevbr]

That makes sense, although less intuitive in my view. Thought this type will make it more verbose and easier to discover in your library

[millsp]

You can still be verbose (but more generic) with https://pirix-gh.github.io/ts-toolbelt/modules/_union_filter_.html#filter

[millsp]

Sorry @regevbr, I meant https://pirix-gh.github.io/ts-toolbelt/modules/_union_select_.html#select

[regevbr]

@pirix-gh do you think we can at least expose

type Index = string | number | symbol;

in the public interface?