| # 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 | |
| --- | |
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