Test if an object is a Stream
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.
var isStream = require('isstream') var Stream = require('stream') isStream(new Stream()) // true isStream({}) // false isStream(new Stream.Readable()) // true isStream(new Stream.Writable()) // true isStream(new Stream.Duplex()) // true isStream(new Stream.Transform()) // true isStream(new Stream.PassThrough()) // true
You can also test for isReadable(obj)
, isWritable(obj)
and isDuplex(obj)
to test for implementations of Streams2 (and Streams3) base classes.
var isReadable = require('isstream').isReadable var isWritable = require('isstream').isWritable var isDuplex = require('isstream').isDuplex var Stream = require('stream') isReadable(new Stream()) // false isWritable(new Stream()) // false isDuplex(new Stream()) // false isReadable(new Stream.Readable()) // true isReadable(new Stream.Writable()) // false isReadable(new Stream.Duplex()) // true isReadable(new Stream.Transform()) // true isReadable(new Stream.PassThrough()) // true isWritable(new Stream.Readable()) // false isWritable(new Stream.Writable()) // true isWritable(new Stream.Duplex()) // true isWritable(new Stream.Transform()) // true isWritable(new Stream.PassThrough()) // true isDuplex(new Stream.Readable()) // false isDuplex(new Stream.Writable()) // false isDuplex(new Stream.Duplex()) // true isDuplex(new Stream.Transform()) // true isDuplex(new Stream.PassThrough()) // true
Reminder: when implementing your own streams, please use readable-stream rather than core streams.
isStream is Copyright (c) 2015 Rod Vagg @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.