1var inherits = require('util').inherits 2 , Readable = require('stream').Readable 3 , ReadableAsyncKit = require('./lib/readable_asynckit.js') 4 , ReadableParallel = require('./lib/readable_parallel.js') 5 , ReadableSerial = require('./lib/readable_serial.js') 6 , ReadableSerialOrdered = require('./lib/readable_serial_ordered.js') 7 ; 8 9// API 10module.exports = 11{ 12 parallel : ReadableParallel, 13 serial : ReadableSerial, 14 serialOrdered : ReadableSerialOrdered, 15}; 16 17inherits(ReadableAsyncKit, Readable); 18 19inherits(ReadableParallel, ReadableAsyncKit); 20inherits(ReadableSerial, ReadableAsyncKit); 21inherits(ReadableSerialOrdered, ReadableAsyncKit); 22