index.js
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	var stream = require("readable-stream");

	var duplex2 = module.exports = function duplex2(options, writable, readable) {
	return new DuplexWrapper(options, writable, readable);
	};

	var DuplexWrapper = exports.DuplexWrapper = function DuplexWrapper(options, writable, readable) {
	if (typeof readable === "undefined") {
	readable = writable;
	writable = options;
	options = null;
	}

	options = options \|\| {};
	options.objectMode = true;

	stream.Duplex.call(this, options);

	this._bubbleErrors = (typeof options.bubbleErrors === "undefined") \|\| !!options.bubbleErrors;

	this._writable = writable;
	this._readable = readable;

	var self = this;

	writable.once("finish", function() {
	self.end();
	});

	this.once("finish", function() {
	writable.end();
	});

	readable.on("data", function(e) {
	if (!self.push(e)) {
	readable.pause();
	}
	});

	readable.once("end", function() {
	return self.push(null);
	});

	if (this._bubbleErrors) {
	writable.on("error", function(err) {
	return self.emit("error", err);
	});

	readable.on("error", function(err) {
	return self.emit("error", err);
	});
	}
	};
	DuplexWrapper.prototype = Object.create(stream.Duplex.prototype, {constructor: {value: DuplexWrapper}});

	DuplexWrapper.prototype._write = function _write(input, encoding, done) {
	this._writable.write(input, encoding, done);
	};

	DuplexWrapper.prototype._read = function _read(n) {
	this._readable.resume();
	};