How to select the buildin led?

So far Espruino has been awesome but as a beginner I have some issues wrapping my head around targeting the pins. In the documentation I can see

NodeMCU.A0
NodeMCU.D0
NodeMCU.D1
NodeMCU.D10
NodeMCU.D2
NodeMCU.D3
NodeMCU.D4
NodeMCU.D5
NodeMCU.D6
NodeMCU.D7
NodeMCU.D8
NodeMCU.D9

However there is no mention of the buildin led on the board. How can I select that?
Also I don't know how I can select the other pins for example S1 S2 EN and RX.

Appreciate it.

@user130486,

you should be able override it just like that var LED1 = NodeMCU.D2; to put NodeMCU.D2 on LED1 (or just any other (var) name). Since it is a pin, it 'understands' .set() and .reset() and all other pin related 'methods' as documented in https://www.espruino.com/Reference#Pin documentation. Since Espruino boards have the LEDs known and (may) preset pin mode, you may need to do that too with the assignment, such as pinMode(NodeMCU.D2,"output"). --- Let us know if it works... your board's built-in LWD - if there is one on any of the pins - or to which pin you will connect the LED w/ resistor - will define the code detail.

I actually managed to get the built-in LED on with :

var led      = NodeMCU.D4;  // built-in LED
var state    = true;        // LED switched on by default
var duration = 500;         // blink the LED every 500 ms

setInterval(function() {
  digitalWrite(led, state);
  state = !state;           // toggle LED state
}, duration);

Thank you so much for guiding me

...very self explanatory! Thanks for sharing.