import { Observable } from 'rxjs';
/**
 * Buffers and emits data for lazy/progressive rendering of big lists
 * That could solve issues with long-running tasks when trying to render an array
 * of similar components.
 * @param delayMs Delay between data emits
 * @param concurrency Amount of elements that should be emitted at once
 */
export declare function lazyArray<T>(delayMs?: number, concurrency?: number): (source$: Observable<T[]>) => Observable<T[]>;
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