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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

This might have already been asked but is there anyway I can use vscode for Espruino or are we stuck with the web ide?

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.

This saved my ass. Thanks.