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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.
@Gordon
Yes, @JumJum has done a bunch of work on this, but it's been a bit of a moving target both with Espressif's SDK and things changing inside Espruino itself, and unfortunately I haven't had any time to put into this either.
For nRF52-based devices, support for the NRF.* API is complete, but on ESP32 it's very much 'try it and see'.
I'd suggest if you really want to use ESP32 for Bluetooth, going with the Arduino IDE is probably your best bet right now.
If you went with BLE advertising (http://www.espruino.com/BLE+Advertising) I think there's a good chance you could knock something up with ESP32 and the Arduino IDE relatively quickly.