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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@ltj
Power to the rgb led comes from another power source not in the picture (could still be sitting in the breadboard power strip with the black wire). In this case, with just one rgb led, vbat could be used as well. The main point is you don't source power from the GPIO pins.
Just to be clear: led power goes to the common-anode terminal (black wire), the cathode of the r,g and b leds (r/g/b wires) is connected to the drain of each mosfet. All mosfet sources are connected to ground. The espruino drives the mosfet gates. I can recommend the many tutorials on the same topic for Arduino. The exact same principles apply.