import { LazyArg } from "@tsplus/stdlib/data/Function";
import { Collection } from "@tsplus/stdlib/collections/Collection/definition";
import { Effect } from "@effect/core/io/Effect/definition";
/**
 * Folds an `Collection<A>` using an effectual function f, working sequentially from left to right.
 * @tsplus static ets/Effect/Ops reduce
 * @tsplus location "@effect/core/io/Effect/operations/reduce"
 */
export declare function reduce<A, Z, R, E>(as: LazyArg<Collection<A>>, z: LazyArg<Z>, f: (z: Z, a: A) => Effect<R, E, Z>, __tsplusTrace?: string): Effect<R, E, Z>;
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