import { Readable } from 'stream';
/**
 *
 */
export declare function decompressReadStream(readStream: Readable, headers?: Headers): Readable;
/**
 *
 * @param readStream
 * @returns
 */
export declare function concatenateReadStream(readStream: any): Promise<ArrayBuffer>;
/**
 * Concatenate a sequence of ArrayBuffers
 * @return A concatenated ArrayBuffer
 * @note duplicates loader-utils since polyfills should be independent
 */
export declare function concatenateArrayBuffers(sources: (ArrayBuffer | Uint8Array)[]): ArrayBuffer;
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