Skip to content
Permalink
9bfb9ba527
Switch branches/tags

Name already in use

A tag already exists with the provided branch name. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Are you sure you want to create this branch?
Go to file
 
 
Cannot retrieve contributors at this time
60 lines (38 sloc) 1.58 KB
# is-stream
> Check if something is a [Node.js stream](https://nodejs.org/api/stream.html)
## Install
```
$ npm install is-stream
```
## Usage
```js
const fs = require('fs');
const isStream = require('is-stream');
isStream(fs.createReadStream('unicorn.png'));
//=> true
isStream({});
//=> false
```
## API
### isStream(stream)
Returns a `boolean` for whether it's a [`Stream`](https://nodejs.org/api/stream.html#stream_stream).
#### isStream.writable(stream)
Returns a `boolean` for whether it's a [`stream.Writable`](https://nodejs.org/api/stream.html#stream_class_stream_writable).
#### isStream.readable(stream)
Returns a `boolean` for whether it's a [`stream.Readable`](https://nodejs.org/api/stream.html#stream_class_stream_readable).
#### isStream.duplex(stream)
Returns a `boolean` for whether it's a [`stream.Duplex`](https://nodejs.org/api/stream.html#stream_class_stream_duplex).
#### isStream.transform(stream)
Returns a `boolean` for whether it's a [`stream.Transform`](https://nodejs.org/api/stream.html#stream_class_stream_transform).
## Related
- [is-file-stream](https://github.com/jamestalmage/is-file-stream) - Detect if a stream is a file stream
---
<div align="center">
<b>
<a href="https://tidelift.com/subscription/pkg/npm-is-stream?utm_source=npm-is-stream&utm_medium=referral&utm_campaign=readme">Get professional support for this package with a Tidelift subscription</a>
</b>
<br>
<sub>
Tidelift helps make open source sustainable for maintainers while giving companies<br>assurances about security, maintenance, and licensing for their dependencies.
</sub>
</div>