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