is-stream 

Check if something is a Node.js stream

Install

$ npm install is-stream

Usage

js
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](https://nodejs.org/api/stream.html#stream_stream).

isStream.writable(stream)

Returns a boolean for whether it's a [stream.Writable](https://nodejs.org/api/stream.html#stream_class_stream_writable).

isStream.readable(stream)

Returns a boolean for whether it's a [stream.Readable](https://nodejs.org/api/stream.html#stream_class_stream_readable).

isStream.duplex(stream)

Returns a boolean for whether it's a [stream.Duplex](https://nodejs.org/api/stream.html#stream_class_stream_duplex).

isStream.transform(stream)

Returns a boolean for whether it's a [stream.Transform](https://nodejs.org/api/stream.html#stream_class_stream_transform).

Related

• is-file-stream - Detect if a stream is a file stream

License

MIT © Sindre Sorhus