import { STM } from "@effect/core/stm/STM/definition/base";
/**
 * Folds over the `STM` effect, handling both P.failure and success, but not
 * retry.
 * @tsplus static effect/core/stm/STM.Aspects fold
 * @tsplus pipeable effect/core/stm/STM fold
 * @tsplus location "@effect/core/stm/STM/operations/fold"
 */
export declare function fold<E, C, A, B>(g: (e: E) => C, f: (a: A) => B): <R>(self: import("../definition").STM<R, E, A>) => import("../definition").STM<R, never, C | B>;
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