import { DeferQueueFeatureConcurrency } from './internal';
export declare function withConcurrencyStatic(value: number): DeferQueueFeatureConcurrency;
/**
 * @param onUpdateConcurrencyFn called when queue processor updates concurrency;
 */
export declare function withConcurrencyUpdateFn(onUpdateConcurrencyFn: () => number): DeferQueueFeatureConcurrency;