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import * as stream from 'stream'; declare const isStream: { /** @returns Whether `stream` is a [`Stream`](https://nodejs.org/api/stream.html#stream_stream). @example ``` import * as fs from 'fs'; import isStream = require('is-stream'); isStream(fs.createReadStream('unicorn.png')); //=> true isStream({}); //=> false ``` */ (stream: unknown): stream is stream.Stream; /** @returns Whether `stream` is a [`stream.Writable`](https://nodejs.org/api/stream.html#stream_class_stream_writable). @example ``` import * as fs from 'fs'; import isStream = require('is-stream'); isStream.writable(fs.createWriteStrem('unicorn.txt')); //=> true ``` */ writable(stream: unknown): stream is stream.Writable; /** @returns Whether `stream` is a [`stream.Readable`](https://nodejs.org/api/stream.html#stream_class_stream_readable). @example ``` import * as fs from 'fs'; import isStream = require('is-stream'); isStream.readable(fs.createReadStream('unicorn.png')); //=> true ``` */ readable(stream: unknown): stream is stream.Readable; /** @returns Whether `stream` is a [`stream.Duplex`](https://nodejs.org/api/stream.html#stream_class_stream_duplex). @example ``` import {Duplex} from 'stream'; import isStream = require('is-stream'); isStream.duplex(new Duplex()); //=> true ``` */ duplex(stream: unknown): stream is stream.Duplex; /** @returns Whether `stream` is a [`stream.Transform`](https://nodejs.org/api/stream.html#stream_class_stream_transform). @example ``` import * as fs from 'fs'; import Stringify = require('streaming-json-stringify'); import isStream = require('is-stream'); isStream.transform(Stringify()); //=> true ``` */ transform(input: unknown): input is stream.Transform; }; export = isStream;