JarCastingis-stream 
Check if something is a Node.js stream
Install
$ npm install is-stream
Usage
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.
isStream.writable(stream)
Returns a boolean for whether it's a stream.Writable.
isStream.readable(stream)
Returns a boolean for whether it's a stream.Readable.
isStream.duplex(stream)
Returns a boolean for whether it's a stream.Duplex.
isStream.transform(stream)
Returns a boolean for whether it's a stream.Transform.
Related
- is-file-stream - Detect if a stream is a file stream
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