import type * as CK from "../../../Collections/Immutable/Chunk";
import type * as T from "../../../Effect";
import type * as C from "./core";
/**
 * A sink that effectfully folds its input chunks with the provided function and initial state.
 * `f` must preserve chunking-invariance.
 */
export declare function foldLeftChunksEffect<R, Err, In, S>(z: S, f: (s: S, chunk: CK.Chunk<In>) => T.Effect<R, Err, S>): C.Sink<R, Err, In, Err, unknown, S>;
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