twitst4tz

isstream.js (588B)

---

 var stream = require('stream')
 
 
 function isStream (obj) {
   return obj instanceof stream.Stream
 }
 
 
 function isReadable (obj) {
   return isStream(obj) && typeof obj._read == 'function' && typeof obj._readableState == 'object'
 }
 
 
 function isWritable (obj) {
   return isStream(obj) && typeof obj._write == 'function' && typeof obj._writableState == 'object'
 }
 
 
 function isDuplex (obj) {
   return isReadable(obj) && isWritable(obj)
 }
 
 
 module.exports            = isStream
 module.exports.isReadable = isReadable
 module.exports.isWritable = isWritable
 module.exports.isDuplex   = isDuplex