import { USTM, STM } from "@effect/core/stm/STM/definition/base";
/**
 * Returns an `STM` effect that succeeds with `undefined`.
 * @tsplus static effect/core/stm/STM.Ops unit
 * @tsplus location "@effect/core/stm/STM/operations/unit"
 */
export declare const unit_: USTM<void>;
/**
 * Ignores the result of the transactional effect replacing it with `undefined`.
 * @tsplus getter effect/core/stm/STM unit
 * @tsplus location "@effect/core/stm/STM/operations/unit"
 */
export declare function unit<R, E, X>(self: STM<R, E, X>): STM<R, E, void>;
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