Nordic "nRF52840 Dongle" Support

Same thing on my dongle. :(

>save()
=undefined
Compacting Flash...
Calculating Size...
Disconnected

>process.memory()
={ free: 12476, usage: 24, total: 12500, history: 7,
  gc: 0, gctime: 20.05004882812, "stackEndAddress": 537092912, flash_start: 0, "flash_binary_end": 478792,
  "flash_code_start": 966656, flash_length: 1048576 }

>require("Storage").getFree()
=40960
>