import { Collection } from "@tsplus/stdlib/collections/Collection/definition";
import { STM } from "@effect/core/stm/STM/definition/base";
/**
 * Determines whether any element of the `Collection<A>` satisfies the effectual
 * predicate `f`.
 * @tsplus static effect/core/stm/STM.Ops exists
 * @tsplus location "@effect/core/stm/STM/operations/exists"
 */
export declare function exists<R, E, A>(as: Collection<A>, f: (a: A) => STM<R, E, boolean>): STM<R, E, boolean>;
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