"use strict";var pna=require("process-nextick-args"),objectKeys=Object.keys||function(e){var t=[];for(var r in e)t.push(r);return t};module.exports=Duplex;var util=require("core-util-is");util.inherits=require("inherits");var Readable=require("./_stream_readable"),Writable=require("./_stream_writable");util.inherits(Duplex,Readable);for(var keys=objectKeys(Writable.prototype),v=0;v<keys.length;v++){var method=keys[v];Duplex.prototype[method]||(Duplex.prototype[method]=Writable.prototype[method])}function Duplex(e){if(!(this instanceof Duplex))return new Duplex(e);Readable.call(this,e),Writable.call(this,e),e&&!1===e.readable&&(this.readable=!1),e&&!1===e.writable&&(this.writable=!1),this.allowHalfOpen=!0,e&&!1===e.allowHalfOpen&&(this.allowHalfOpen=!1),this.once("end",onend)}function onend(){this.allowHalfOpen||this._writableState.ended||pna.nextTick(onEndNT,this)}function onEndNT(e){e.end()}Object.defineProperty(Duplex.prototype,"writableHighWaterMark",{enumerable:!1,get:function(){return this._writableState.highWaterMark}}),Object.defineProperty(Duplex.prototype,"destroyed",{get:function(){return void 0!==this._readableState&&void 0!==this._writableState&&(this._readableState.destroyed&&this._writableState.destroyed)},set:function(e){void 0!==this._readableState&&void 0!==this._writableState&&(this._readableState.destroyed=e,this._writableState.destroyed=e)}}),Duplex.prototype._destroy=function(e,t){this.push(null),this.end(),pna.nextTick(t,e)};