simple node.js tcp server

example.js

const tcpServer=require("./tcp-server.js");
var server=new tcpServer(80);
server.setupServeListener(function(){
  console.log("START SERVER on port "+this.port);
});
server.setupConnectListener(function(conn){
  console.log("client connected!!! "+conn.remoteAddress);
});
server.setupDataProcessor(function(data, conn){
  console.log(data);
  return "HELLO CLIENT";
});

tcp-server.js

/*
Sett Sarverott 2018

module for tcp server

*/
const net=require("net");
module.exports=class TCPserver{
  constructor(port){
    this.port=port;
    var funct=function(x=null,y=null){null};
    this.async=false;
    this.onServe=funct;
    this.onError=funct;
    this.onClientEnd=funct;
    this.onData=funct;
    this.onConnect=funct;
    this.dataProcessor=funct;
  }
  setAsyncResponse(isAs){
    this.async=isAs;
  }
  setupServeListener(funct){
    this.onServe=funct;
  }
  setupErrorListener(funct){
    this.onError=funct;
  }
  setupClientEndListener(funct){
    this.onClientEnd=funct;
  }
  setupDataListener(funct){
    this.onData=funct;
  }
  setupConnectListener(funct){
    this.onConnect=funct;
  }
  setupDataProcessor(funct){
    this.dataProcessor=funct;
  }
  dataProcessing(connection, data){
    if(this.async){
      this.dataProcessor(data, connection, function(output){
        connection.write(output);
      });
    }else{
      connection.write(this.dataProcessor(data, connection));
    }
  }
  serve(){
    var hook=this;
    this.server=net.createServer(function(connection){
      hook.onConnect(connection);
    	connection.on('end',this.onClientEnd);
    	connection.on('data',function(data){
    		hook.onData(data);
    		hook.dataProcessing(connection, data);
    	});
    	connection.pipe(connection);
    });
    this.server.on('error',this.onError);
    this.server.listen(this.port,this.onServe);
  }
}