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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
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