import { Readable } from 'stream';
import { DataType } from 'test-bed-schemas';
import { TestBedAdapter, RecordMetadata } from '../index.mjs';
import { ITestBedOptions } from '../models/index.mjs';
import { Logger } from '../logger/logger.mjs';
export declare const clone: <T extends any>(model: T) => T;
/**
 * Find all files recursively in specific folder with specific extension
 *
 * @param directoryName Path relative to this file or other file which requires this files
 * @param ext Extension name, e.g: '.html'
 * @return Result files with path string in an array
 */
export declare const findFilesInDir: (directoryName: string, ext: string) => string[];
/**
 * Look for schema files that represent a value, but without a corresponding key file, i.e.
 * a schema file names <topic>-value.avsc should also have a <topic>-key.avsc.
 *
 * @param files Found schema files
 * @return missing key schema files
 */
export declare const findMissingKeyFiles: (files: string[]) => string[];
/**
 * Create a RFC4122 version 4 GUID
 *
 * @see https://stackoverflow.com/a/2117523/319711
 *
 * @returns RFC4122 version 4 compliant GUID
 */
export declare const uuid4: () => string;
/**
 * Check if the object is empty.
 * @param obj Any object
 * @see https://stackoverflow.com/a/32108184/319711
 */
export declare const isEmptyObject: (obj: Object) => boolean;
/** Convert a buffer to a readable stream, e.g. to send it via FormData */
export declare const bufferToStream: (buffer: Buffer) => Readable;
/**
 * Helper function to create a callback that automatically sends a large file upload message
 * to the Test-bed's LargeDataUpdateTopic (system_large_data_update). This callback can be
 * passed to the uploadFile function of the adapter.
 *
 * @param adapter test bed adapter, needed to send the message
 * @param title title of the large file upload message
 * @param description description of the large file upload message
 * @param dataType data type of the message
 * @param callback to return the result of the large file upload (default logs errors)
 */
export declare const largeFileUploadCallback: (adapter: TestBedAdapter, title?: string, description?: string, dataType?: DataType, cb?: (err: Error, data?: RecordMetadata[]) => void) => (err?: Error, url?: string) => void;
/** Is unique filter for array filter method */
export declare const isUnique: <T extends any>(value: T, index: number, arr: T[]) => boolean;
/** Check if the schema registry is available */
export declare const isSchemaRegistryAvailable: (options: ITestBedOptions, log: Logger) => Promise<void>;
export declare const resolveUrl: (from: string, to: string) => string;
/** Sleep for msec time */
export declare const sleep: (msec: number) => Promise<unknown>;
export interface MapOptions {
    concurrency?: number;
}