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