import { TSet } from "@effect/core/stm/TSet/definition";
import { USTM } from "@effect/core/stm/STM/definition/base";
/**
 * Tests whether or not set contains an element.
 * @tsplus fluent ets/TSet contains
 * @tsplus location "@effect/core/stm/TSet/operations/contains"
 */
export declare function contains_<A>(self: TSet<A>, a: A): USTM<boolean>;
/**
 * Tests whether or not set contains an element.
 * @tsplus static ets/TSet/Aspects contains
 * @tsplus pipeable ets/TSet contains
 * @tsplus location "@effect/core/stm/TSet/operations/contains"
 */
export declare const contains: <A>(a: A) => (self: import("../definition").TSet<A>) => import("../../STM").USTM<boolean>;
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