# duplexer3 [](https://travis-ci.org/floatdrop/duplexer3) [](https://coveralls.io/github/floatdrop/duplexer3?branch=master) Like [duplexer2](https://github.com/deoxxa/duplexer2) but using Streams3 without readable-stream dependency ```javascript var stream = require("stream"); var duplexer3 = require("duplexer3"); var writable = new stream.Writable({objectMode: true}), readable = new stream.Readable({objectMode: true}); writable._write = function _write(input, encoding, done) { if (readable.push(input)) { return done(); } else { readable.once("drain", done); } }; readable._read = function _read(n) { // no-op }; // simulate the readable thing closing after a bit writable.once("finish", function() { setTimeout(function() { readable.push(null); }, 500); }); var duplex = duplexer3(writable, readable); duplex.on("data", function(e) { console.log("got data", JSON.stringify(e)); }); duplex.on("finish", function() { console.log("got finish event"); }); duplex.on("end", function() { console.log("got end event"); }); duplex.write("oh, hi there", function() { console.log("finished writing"); }); duplex.end(function() { console.log("finished ending"); }); ``` ``` got data "oh, hi there" finished writing got finish event finished ending got end event ``` ## Overview This is a reimplementation of [duplexer](https://www.npmjs.com/package/duplexer) using the Streams3 API which is standard in Node as of v4. Everything largely works the same. ## Installation [Available via `npm`](https://docs.npmjs.com/cli/install): ``` $ npm i duplexer3 ``` ## API ### duplexer3 Creates a new `DuplexWrapper` object, which is the actual class that implements most of the fun stuff. All that fun stuff is hidden. DON'T LOOK. ```javascript duplexer3([options], writable, readable) ``` ```javascript const duplex = duplexer3(new stream.Writable(), new stream.Readable()); ``` Arguments * __options__ - an object specifying the regular `stream.Duplex` options, as well as the properties described below. * __writable__ - a writable stream * __readable__ - a readable stream Options * __bubbleErrors__ - a boolean value that specifies whether to bubble errors from the underlying readable/writable streams. Default is `true`. ## License 3-clause BSD. [A copy](./LICENSE) is included with the source. ## Contact * GitHub ([deoxxa](http://github.com/deoxxa)) * Twitter ([@deoxxa](http://twitter.com/deoxxa)) * Email ([deoxxa@fknsrs.biz](mailto:deoxxa@fknsrs.biz))