58 lines
1.7 KiB
Markdown
58 lines
1.7 KiB
Markdown
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# 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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```sh
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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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import fs from 'node:fs';
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import {isStream} from '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, options?)
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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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### isWritableStream(stream, options?)
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Returns a `boolean` for whether it's a [`stream.Writable`](https://nodejs.org/api/stream.html#stream_class_stream_writable), an [`http.OutgoingMessage`](https://nodejs.org/api/http.html#class-httpoutgoingmessage), an [`http.ServerResponse`](https://nodejs.org/api/http.html#class-httpserverresponse) or an [`http.ClientRequest`](https://nodejs.org/api/http.html#class-httpserverresponse).
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### isReadableStream(stream, options?)
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Returns a `boolean` for whether it's a [`stream.Readable`](https://nodejs.org/api/stream.html#stream_class_stream_readable) or an [`http.IncomingMessage`](https://nodejs.org/api/http.html#class-httpincomingmessage).
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### isDuplexStream(stream, options?)
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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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### isTransformStream(stream, options?)
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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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### Options
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#### checkOpen
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Type: `boolean`\
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Default: `true`
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When this option is `true`, the method returns `false` if the stream has already been closed.
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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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