57 lines
1.3 KiB
Markdown
57 lines
1.3 KiB
Markdown
# is-stream [](https://travis-ci.org/sindresorhus/is-stream)
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> Check if something is a [Node.js stream](https://nodejs.org/api/stream.html)
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## Install
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```
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$ npm install is-stream
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```
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## Usage
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```js
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const fs = require('fs');
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const 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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## API
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### isStream(stream)
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Returns a `boolean` for whether it's a [`Stream`](https://nodejs.org/api/stream.html#stream_stream).
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#### isStream.writable(stream)
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Returns a `boolean` for whether it's a [`stream.Writable`](https://nodejs.org/api/stream.html#stream_class_stream_writable).
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#### isStream.readable(stream)
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Returns a `boolean` for whether it's a [`stream.Readable`](https://nodejs.org/api/stream.html#stream_class_stream_readable).
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#### isStream.duplex(stream)
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Returns a `boolean` for whether it's a [`stream.Duplex`](https://nodejs.org/api/stream.html#stream_class_stream_duplex).
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#### isStream.transform(stream)
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Returns a `boolean` for whether it's a [`stream.Transform`](https://nodejs.org/api/stream.html#stream_class_stream_transform).
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## Related
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- [is-file-stream](https://github.com/jamestalmage/is-file-stream) - Detect if a stream is a file stream
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## License
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MIT © [Sindre Sorhus](https://sindresorhus.com)
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