Arduino and MCU Support

[frasdoge]

I am looking to use D for microcontroller programming due to its 
benefits over C in workflow and general language features.

I was wondering what the current state of this is, especially 
with regards to AVR. An example of the MCUs I would like to 
develop with include anything from 8 bit ATmega328p to 32 bit 
ESP32.

The ESP32 can be programmed in C, C++, micropython and Lua, so 
I'm hoping there's at least some compatibility there.