import { THub } from "@effect/core/stm/THub/definition";
import { USTM } from "@effect/core/stm/STM/definition/base";
import { Maybe } from "@tsplus/stdlib/data/Maybe/definition";
/**
 * Takes a single element from the queue, returning `None` if the queue is
 * empty.
 * @tsplus getter effect/core/stm/THub/TDequeue poll
 * @tsplus location "@effect/core/stm/THub/operations/TDequeue/poll"
 */
export declare function poll<A>(self: THub.TDequeue<A>): USTM<Maybe<A>>;
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