import { Collection } from "@tsplus/stdlib/collections/Collection/definition";
import { HashSet } from "@tsplus/stdlib/collections/HashSet/definition";
/**
 * Chains over the values of the `HashSet` using the specified function.
 * @tsplus static HashSet.Aspects flatMap
 * @tsplus pipeable HashSet flatMap
 * @tsplus location "@tsplus/stdlib/collections/HashSet/operations/flatMap"
 */
export declare function flatMap<A, B>(f: (a: A) => Collection<B>): (self: HashSet<A>) => HashSet<B>;
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