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schangxiang@126.com

2025-09-19 18966e02fb573c7e2bb0c6426ed792b38b910940

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# is-stream [![Build Status](https://travis-ci.org/sindresorhus/is-stream.svg?branch=master)](https://travis-ci.org/sindresorhus/is-stream)
 
> Check if something is a [Node.js stream](https://nodejs.org/api/stream.html)
 
 
## Install
 
```
$ npm install --save is-stream
```
 
 
## Usage
 
```js
const fs = require('fs');
const isStream = require('is-stream');
 
isStream(fs.createReadStream('unicorn.png'));
//=> true
 
isStream({});
//=> false
```
 
 
## API
 
### isStream(stream)
 
#### isStream.writable(stream)
 
#### isStream.readable(stream)
 
#### isStream.duplex(stream)
 
#### isStream.transform(stream)
 
 
## License
 
MIT © [Sindre Sorhus](https://sindresorhus.com)