| var Stream = require('stream'); | 
| if (process.env.READABLE_STREAM === 'disable' && Stream) { | 
|   module.exports = Stream.Readable; | 
|   Object.assign(module.exports, Stream); | 
|   module.exports.Stream = Stream; | 
| } else { | 
|   exports = module.exports = require('./lib/_stream_readable.js'); | 
|   exports.Stream = Stream || exports; | 
|   exports.Readable = exports; | 
|   exports.Writable = require('./lib/_stream_writable.js'); | 
|   exports.Duplex = require('./lib/_stream_duplex.js'); | 
|   exports.Transform = require('./lib/_stream_transform.js'); | 
|   exports.PassThrough = require('./lib/_stream_passthrough.js'); | 
|   exports.finished = require('./lib/internal/streams/end-of-stream.js'); | 
|   exports.pipeline = require('./lib/internal/streams/pipeline.js'); | 
| } |