This repository is the react/platformio version of the demo you can find at https://github.com/webusb/arduino repository.
Contains two parts: sketch code (for platformio) and website code, demonstrating the use of webusb on arduino.
Sketch should be uploaded to one of the listed dev boards (see Serial.ts), if you add your own it should have a native USB interface.
React app is run with yarn start, spawns it at localhost:3000.
No need to modify any USB defines for platformio as it is necessary for the Arduino IDE.
End result is you being able to toggle three leds connected to the arduino: red, green and blue. You can toggle them via the website, provided you have actually put the LED's at the pins specified inside the sketch - 9, 10, 11.