Cannot get pigpio PWM to work with an AC dimmer module

Question

I am using an AC dimmer module to dim a 240V light. I would like to use node.js so I am using the pigpio module.

The script is not working as expected as the light bulb goes straight to 100% when I execute the node.js script.

The AC dimmer module is http://www.inmojo.com/store/krida-electronics/item/ac-led-light-dimmer-module-with-heatsink/

Module's Pins:

+5V -> device power, DC 5 volts 
SYNC -> zero-cross detector output positive impulse (pulse length 200us) 
GATE -> triac gate input pin 
GND -> ground of low voltage side 

I have connected Module's VCC, GND and Gate pins to raspberry's +5, GND pin 18 respectively.

(the wiring is actually done with a Raspberry Pi 3, ignore the Arduino board in the wiring diagram above)

My code:

var Gpio = require('pigpio').Gpio,
  led = new Gpio(18, {mode: Gpio.OUTPUT}),
  dutyCycle = 0;


led.pwmWrite(dutyCycle);

setInterval(function () {
  led.pwmWrite(dutyCycle);

  dutyCycle += 1;
  if (dutyCycle > 255) {
    dutyCycle = 0;
  }
}, 20);

I have also tried with the led.hardwarePwmWrite() method, but I am a bit confused as to how this can be used.

Is there anything that can be fixed in my wiring, the above code or by implementing hardwarePwmWrite()?