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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;