"Serial1.on('data', function (data) {......" not works for me, is works for any other ??

Please provide me your exact firmware. (if possible) becaue I'm using 4mb version that may be differ from yours.

Espruino branch: master

>process.env
={
  VERSION: "1v99.4128",
  GIT_COMMIT: "5b447a61",
  BOARD: "ESP8266_4MB",
  FLASH: 0, RAM: 81920,
  SERIAL: "5ccf7fc1-120b",
  CONSOLE: "Telnet",
  MODULES: "Flash,Storage,net" ... "r,crypto,neopixel",
  EXPTR: 1073643636 }
> 

try this snippet too:

var status=0;
var i=0;
function swap() {
  i++;
  status = !status;
  console.log(i,"data",Date().toString());
}

Serial1.on('data', function (data) { swap(); });