import { LazyArg } from "@tsplus/stdlib/data/Function";
import { STM } from "@effect/core/stm/STM/definition/base";
import { Maybe } from "@tsplus/stdlib/data/Maybe/definition";
/**
 * The moral equivalent of `if (!p) exp`
 * @tsplus static effect/core/stm/STM.Aspects unless
 * @tsplus pipeable effect/core/stm/STM unless
 * @tsplus location "@effect/core/stm/STM/operations/unless"
 */
export declare function unless(predicate: LazyArg<boolean>): <R, E, A>(self: import("../definition").STM<R, E, A>) => import("../definition").STM<R, E, import("@tsplus/stdlib/data/Maybe").Maybe<A>>;
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