import { STM } from "@effect/core/stm/STM/definition/base";
import { Maybe } from "@tsplus/stdlib/data/Maybe/definition";
/**
 * The moral equivalent of `if (p) exp` when `p` has side-effects.
 * @tsplus static effect/core/stm/STM.Ops whenSTM
 * @tsplus location "@effect/core/stm/STM/operations/whenSTM"
 */
export declare function whenSTM<R, E, R1, E1, A>(predicate: STM<R, E, boolean>, effect: STM<R1, E1, A>): STM<R | R1, E | E1, Maybe<A>>;
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