import { TSet } from "@effect/core/stm/TSet/definition";
import { STM } from "@effect/core/stm/STM/definition/base";
/**
 * Atomically transforms the set into the union of itself and the provided
 * set.
 * @tsplus static effect/core/stm/TSet.Aspects union
 * @tsplus pipeable effect/core/stm/TSet union
 * @tsplus location "@effect/core/stm/TSet/operations/union"
 */
export declare function union<A>(other: TSet<A>): (self: TSet<A>) => STM<never, never, void>;
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