import { TPriorityQueue } from "@effect/core/stm/TPriorityQueue/definition";
import { USTM } from "@effect/core/stm/STM/definition/base";
/**
 * Peeks at the first value in the queue without removing it, retrying until a
 * value is in the queue.
 * @tsplus getter effect/core/stm/TPriorityQueue peek
 * @tsplus location "@effect/core/stm/TPriorityQueue/operations/peek"
 */
export declare function peek<A>(self: TPriorityQueue<A>): USTM<A>;
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