Function difference

repos/effect/packages/effect/src/internal/hashSet.ts:137–138

(self: HashSet<V0>, that: HashSet<V1>)

/** @internal */
export const difference = <V0, V1>(self: HashSet<V0>, that: HashSet<V1>): HashSet<V0> =>
  fromPredicate(self, (value) => !has(that, value as any))

/** @internal */
export const isSubset = <V0, V1>(self: HashSet<V0>, that: HashSet<V1>): boolean => {