Did not know that in could be used on unions; that is very convenient!
in
My solution was a bit more verbose due to requiring a type narrowing on the callback argument, but it works as well:
function handleSale(events: { [genre in Books['genre'] as `on${genre}`]?: (e: Books & { genre: genre }) => void }) { /* ... */ }
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Did not know that
incould be used on unions; that is very convenient!My solution was a bit more verbose due to requiring a type narrowing on the callback argument, but it works as well: