Node.js fs createWriteStream() write UTF8 data

var fs = require("fs");

var data = 'abc';

var writeStream = fs.createWriteStream('input.txt');

writeStream.write(data,'UTF8');

writeStream.end();/* w  w  w.j av  a  2s .c o m*/

writeStream.on('finish',function(){
  console.log("finished");
});

writeStream.on('error',function(err){
  console.log(err.stack);
});