celest dust
How do I properly annotate a Map in TS? I want to specify the possible keys and its values like this:
type options = {
foo?: 'black' | 'blue';
bar?: 'smart' | 'very smart';
}
const o: Map<keyof options, options[keyof options]> = new Map();
seems not to work as expected
tidal rivet
you kinda can't, maps just aren't made for that
celest dust
weird. The problem seems to me that I can't use a generic that matches the key to the value
as I understand it keyof options is interpreted as possibly two different keys so the value is always all values
tidal rivet
see Record<keyof options, options[keyof options]> vs { [K in keyof options]: options[K] }
unfortunately, Map doesn't have something for the latter
celest dust
well, ok thank you
odd bay
nitpick:
const o = new Map<keyof options, options[keyof options]>();