is-node-stream

Strictly and correctly checks if value is a nodejs stream.

Install

npm i is-node-stream --save

Usage

For more use-cases see the tests

var stream = require('stream')
var isNodeStream = require('is-node-stream')

isNodeStream(val) returns true when

isNodeStream(new stream.Stream())
isNodeStream(new stream.Duplex())
isNodeStream(new stream.Readable())
isNodeStream(new stream.Writable())
isNodeStream(new stream.Transform())
isNodeStream(new stream.PassThrough())
isNodeStream(new net.Socket())
isNodeStream(fs.createReadStream('package.json'))

isNodeStream.readable(val) returns true when

isNodeStream.readable(process.stdin)
isNodeStream.readable(new stream.Duplex())
isNodeStream.readable(new stream.Readable())
isNodeStream.readable(new stream.Transform())
isNodeStream.readable(new stream.PassThrough())
isNodeStream.readable(fs.createReadStream('package.json'))

isNodeStream.writable(val) returns true when

isNodeStream.writable(process.stdout)
isNodeStream.writable(new stream.Duplex())
isNodeStream.writable(new stream.Writable())
isNodeStream.writable(new stream.Transform())
isNodeStream.writable(new stream.PassThrough())
isNodeStream.writable(fs.createWriteStream('foobar'))

isNodeStream.duplex(val) returns true when

isNodeStream.duplex(new stream.Duplex())
isNodeStream.duplex(new stream.Transform())
isNodeStream.duplex(new stream.PassThrough())

Related

• dush: Minimalist 1.5kb event delegation for the browser (IE8+) and nodejs.
• is-emitter: Check that given value is EventEmitter, not so strict as is-node-emitter.
• is-node-emitter: Strictly checks that given value is nodejs EventEmitter… more
• is-stream: Check if something is a Node.js stream
• to-emitter: Convert any object into an event-emitter, and emits events with the… more

Contributing

Pull requests and stars are always welcome. For bugs and feature requests, please create an issue.
But before doing anything, please read the CONTRIBUTING.md guidelines.

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