import { Effect } from "@effect/core/io/Effect/definition";
import { Sink } from "@effect/core/stream/Sink/definition/base";
/**
 * A sink that effectfully folds its inputs with the provided function and
 * initial state.
 * @tsplus static effect/core/stream/Sink.Ops foldLeftEffect
 * @tsplus location "@effect/core/stream/Sink/operations/foldLeftEffect"
 */
export declare function foldLeftEffect<R, E, In, S>(z: S, f: (s: S, input: In) => Effect<R, E, S>): Sink<R, E, In, In, S>;
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