function map.modifyAtimport { map } from "https://deno.land/x/fun@v2.0.0-alpha.6/mod.ts"; const { modifyAt } = map; modifyAt<B>(S: Eq<B>): (key: B) => <A>(modifyFn: (value: A) => A) => (map: ReadonlyMap<B, A>) => ReadonlyMap<B, A>Type ParametersBParametersS: Eq<B>Returns(key: B) => <A>(modifyFn: (value: A) => A) => (map: ReadonlyMap<B, A>) => ReadonlyMap<B, A>