www.aleph1.co.uk Git - yaffs-website/blob - node_modules/is-stream/index.js

   1 'use strict';
   2
   3 var isStream = module.exports = function (stream) {
   4         return stream !== null && typeof stream === 'object' && typeof stream.pipe === 'function';
   5 };
   6
   7 isStream.writable = function (stream) {
   8         return isStream(stream) && stream.writable !== false && typeof stream._write === 'function' && typeof stream._writableState === 'object';
   9 };
  10
  11 isStream.readable = function (stream) {
  12         return isStream(stream) && stream.readable !== false && typeof stream._read === 'function' && typeof stream._readableState === 'object';
  13 };
  14
  15 isStream.duplex = function (stream) {
  16         return isStream.writable(stream) && isStream.readable(stream);
  17 };
  18
  19 isStream.transform = function (stream) {
  20         return isStream.duplex(stream) && typeof stream._transform === 'function' && typeof stream._transformState === 'object';
  21 };