import { TPriorityQueue } from "@effect/core/stm/TPriorityQueue/definition";
import { USTM } from "@effect/core/stm/STM/definition/base";
/**
 * Returns the size of the queue.
 * @tsplus getter ets/TPriorityQueue size
 * @tsplus location "@effect/core/stm/TPriorityQueue/operations/size"
 */
export declare function size<A>(self: TPriorityQueue<A>): USTM<number>;
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