import { THub } from "@effect/core/stm/THub/definition";
/**
 * The maximum capacity of the queue.
 * @tsplus getter ets/THub/TDequeue capacity
 * @tsplus location "@effect/core/stm/THub/operations/TDequeue/capacity"
 */
export declare function capacity<A>(self: THub.TDequeue<A>): number;
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