/// <reference types="node" />
import { AnyIterable, IX } from "./types";
import { ProgressReportOptions } from "./helpers";
export declare function onLastItem<T>(fn: () => any): (q: AnyIterable<T>) => AsyncGenerator<T, void, unknown>;
export interface CacheIterOptions extends ProgressReportOptions {
    /**
     * Where cache data will be stored?
     */
    cacheFolder: string;
    /**
     * Is cache enabled?
     */
    enabled?: boolean;
    /**
     * When reference id changes cache folder will be regenerated.
     */
    referenceId?: string;
    /**
     * Format cache in human readable `JSON` format.
     */
    nice?: {
        buffer: number;
    };
    logger?: Pick<Console, 'info'>;
}
export declare function _cacheIter<T>(data: AnyIterable<T>, options: CacheIterOptions): IX<T>;
/**
 * Cache iterator output to file.
 * Useful when we need develop complex iterator pipelines.
 * @include ./CacheIterOptions.md
 * @example
 *  import { cacheIter } from 'iterparse'
 *
 *  getFeed() // If cache exists get feed function will not be called
 *      .pipe(cacheIter({ cacheFolder: "./_cache" }))
 *      .count()
 *
 * @example
 *  import { cacheIter } from 'iterparse'
 *
 *  const cachedIter = cacheIter(getFeed(), { cacheFolder: "./_cache" })
 *
 *  for await (const item of cachedIter) {
 *      console.log(item)
 *  }
 * @category Utility
 */
export declare function cacheIter<T>(options: CacheIterOptions): (data: AnyIterable<T>) => IX<T>;
export declare function cacheIter<T>(data: AnyIterable<T>, options: CacheIterOptions): IX<T>;
//# sourceMappingURL=cache.d.ts.map