# Duplex Stream-like
> Test if a value is Node [duplex stream][nodejs-stream]-like.
## Usage
```javascript
var isNodeDuplexStreamLike = require( '@stdlib/assert/is-node-duplex-stream-like' );
```
#### isNodeDuplexStreamLike( value )
Tests if a `value` is Node [duplex stream][nodejs-stream]-like.
```javascript
var transformStream = require( '@stdlib/streams/node/transform' );
var bool = isNodeDuplexStreamLike( transformStream() );
// returns true
```
## Examples
```javascript
var stream = require( 'stream' );
var transformStream = require( '@stdlib/streams/node/transform' );
var isNodeDuplexStreamLike = require( '@stdlib/assert/is-node-duplex-stream-like' );
var bool = isNodeDuplexStreamLike( new stream.Duplex() );
// returns true
bool = isNodeDuplexStreamLike( new stream.Transform() );
// returns true
bool = isNodeDuplexStreamLike( transformStream() );
// returns true
bool = isNodeDuplexStreamLike( new stream.Writable() );
// returns false
bool = isNodeDuplexStreamLike( new stream.Readable() );
// returns false
bool = isNodeDuplexStreamLike( new stream.Stream() );
// returns false
bool = isNodeDuplexStreamLike( {} );
// returns false
bool = isNodeDuplexStreamLike( [] );
// returns false
bool = isNodeDuplexStreamLike( null );
// returns false
function Stream() {
return this;
}
bool = isNodeDuplexStreamLike( Stream );
// returns false
bool = isNodeDuplexStreamLike( new Stream() );
// returns false
```
[nodejs-stream]: https://nodejs.org/api/stream.html