import { STM } from "@effect/core/stm/STM/definition/base";
/**
 * Flattens out a nested `STM` effect.
 * @tsplus static effect/core/stm/STM.Ops flatten
 * @tsplus getter effect/core/stm/STM flatten
 * @tsplus location "@effect/core/stm/STM/operations/flatten"
 */
export declare function flatten<R, E, R1, E1, B>(self: STM<R, E, STM<R1, E1, B>>): STM<R1 | R, E | E1, B>;
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