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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.
@maze1980
The ESP8266 gets warm as well - I didn't try it with NodeMCU but I'm pretty sure it would be cooler, too: The ESP8266 and ESP32 support multiple sleep modes, on Espruino only deepsleep() is implemented (deepsleep stops the processor, WLAN etc. and reboots it to wake up). The other sleep options are not available, and as such the processor is always active. In Micropython you used the sleep() function, no wonder it's using less energy and keeps cooler. If you would implement the Micropython version without sleep() the power consumption and temperature should be equal to the Espruino.
So I wouldn't say it's a bug, but the intended operation for the - obviously limited - builds for ESP8266/ESP32.