import { THub } from "@effect/core/stm/THub/definition";
import { USTM } from "@effect/core/stm/STM/definition/base";
/**
 * Checks if the queue is empty.
 * @tsplus getter ets/THub/TDequeue isEmpty
 * @tsplus location "@effect/core/stm/THub/operations/TDequeue/isEmpty"
 */
export declare function isEmpty<A>(self: THub.TDequeue<A>): USTM<boolean>;
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