import { TSet } from "@effect/core/stm/TSet/definition";
import { USTM } from "@effect/core/stm/STM/definition/base";
/**
 * Atomically transforms the set into the union of itself and the provided
 * set.
 * @tsplus fluent ets/TSet union
 * @tsplus location "@effect/core/stm/TSet/operations/union"
 */
export declare function union_<A>(self: TSet<A>, other: TSet<A>): USTM<void>;
/**
 * Atomically transforms the set into the union of itself and the provided
 * set.
 * @tsplus static ets/TSet/Aspects union
 * @tsplus pipeable ets/TSet union
 * @tsplus location "@effect/core/stm/TSet/operations/union"
 */
export declare const union: <A>(other: import("../definition").TSet<A>) => (self: import("../definition").TSet<A>) => import("../../STM").USTM<void>;
//# sourceMappingURL=union.d.ts.map