1var Stream = require('stream'); 2if (process.env.READABLE_STREAM === 'disable' && Stream) { 3 module.exports = Stream.Readable; 4 Object.assign(module.exports, Stream); 5 module.exports.Stream = Stream; 6} else { 7 exports = module.exports = require('./lib/_stream_readable.js'); 8 exports.Stream = Stream || exports; 9 exports.Readable = exports; 10 exports.Writable = require('./lib/_stream_writable.js'); 11 exports.Duplex = require('./lib/_stream_duplex.js'); 12 exports.Transform = require('./lib/_stream_transform.js'); 13 exports.PassThrough = require('./lib/_stream_passthrough.js'); 14 exports.finished = require('./lib/internal/streams/end-of-stream.js'); 15 exports.pipeline = require('./lib/internal/streams/pipeline.js'); 16} 17