/// <reference types="node" />
import { URL } from "url";
import * as stream from "stream";
/**
 * Infer which port to use.
 *
 * @category Util
 */
declare function inferPort(url: URL): string | 80 | 443;
/**
 * Check if protocol is supported.
 *
 * @category Util
 */
declare function isProtocolSupported(url: URL): boolean;
/**
 * Create a read stream from some data.
 * @param data
 * @param _opt
 */
declare function startStream(data: string, _opt?: {
    debug?: boolean;
}): stream.Readable;
/**
 * Collect all chunks and concat their content as one string.
 * @param readStream
 */
declare function endStream(readStream: NodeJS.ReadableStream): Promise<string>;
/**
 * Decompress a stream.
 * @param iStream
 * @param encoding
 */
declare function decompressStream(iStream: NodeJS.ReadableStream, encoding?: "br" | "gzip" | "deflate" | string): NodeJS.ReadableStream;
export { inferPort, isProtocolSupported, startStream, endStream, decompressStream };
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