Jaguar v0.3.2 comes with pre-built binaries for Windows, macOS, and Linux and you don't need anything else to get going with live reloading on your ESP32:
1. Install jag: https://github.com/toitlang/jaguar#how-do-i-use-it
2. Install VS code extension: https://github.com/toitlang/jaguar#visual-studio-code
It takes a few minutes to complete the installation and with that you can flash your device once and keep updating it over local WiFi in seconds while you develop and learn (ala Arduino OTA but much, much faster).
$ jag flash
$ jag watch i2c.toit
where the i2c.toit could look something like this: https://github.com/toitlang/toit/blob/m ... s/i2c.toit.