tinygo/targets/arduino-nano33.json

{
    "inherits": ["atsamd21g18a"],
    "build-tags": ["sam", "atsamd21g18a", "arduino_nano33"],
    "flash-command": "bossac -i -e -w -v -R -U --port={port} --offset=0x2000 {bin}",
    "flash-1200-bps-reset": "true"
}