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67 lines
2.4 KiB
67 lines
2.4 KiB
3 years ago
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# isStream
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[](http://travis-ci.org/rvagg/isstream)
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**Test if an object is a `Stream`**
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[](https://nodei.co/npm/isstream/)
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The missing `Stream.isStream(obj)`: determine if an object is standard Node.js `Stream`. Works for Node-core `Stream` objects (for 0.8, 0.10, 0.11, and in theory, older and newer versions) and all versions of **[readable-stream](https://github.com/isaacs/readable-stream)**.
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## Usage:
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```js
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var isStream = require('isstream')
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var Stream = require('stream')
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isStream(new Stream()) // true
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isStream({}) // false
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isStream(new Stream.Readable()) // true
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isStream(new Stream.Writable()) // true
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isStream(new Stream.Duplex()) // true
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isStream(new Stream.Transform()) // true
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isStream(new Stream.PassThrough()) // true
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```
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## But wait! There's more!
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You can also test for `isReadable(obj)`, `isWritable(obj)` and `isDuplex(obj)` to test for implementations of Streams2 (and Streams3) base classes.
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```js
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var isReadable = require('isstream').isReadable
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var isWritable = require('isstream').isWritable
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var isDuplex = require('isstream').isDuplex
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var Stream = require('stream')
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isReadable(new Stream()) // false
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isWritable(new Stream()) // false
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isDuplex(new Stream()) // false
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isReadable(new Stream.Readable()) // true
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isReadable(new Stream.Writable()) // false
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isReadable(new Stream.Duplex()) // true
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isReadable(new Stream.Transform()) // true
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isReadable(new Stream.PassThrough()) // true
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isWritable(new Stream.Readable()) // false
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isWritable(new Stream.Writable()) // true
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isWritable(new Stream.Duplex()) // true
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isWritable(new Stream.Transform()) // true
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isWritable(new Stream.PassThrough()) // true
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isDuplex(new Stream.Readable()) // false
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isDuplex(new Stream.Writable()) // false
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isDuplex(new Stream.Duplex()) // true
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isDuplex(new Stream.Transform()) // true
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isDuplex(new Stream.PassThrough()) // true
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```
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*Reminder: when implementing your own streams, please [use **readable-stream** rather than core streams](http://r.va.gg/2014/06/why-i-dont-use-nodes-core-stream-module.html).*
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## License
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**isStream** is Copyright (c) 2015 Rod Vagg [@rvagg](https://twitter.com/rvagg) and licenced under the MIT licence. All rights not explicitly granted in the MIT license are reserved. See the included LICENSE.md file for more details.
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