usbHidUsage property Null safety
The unique USB HID usage ID of this physical key on the keyboard.
Due to the variations in platform APIs, this may not be the actual HID usage code from the hardware, but a value derived from available information on the platform.
See www.usb.org/sites/default/files/documents/hut1_12v2.pdf for the HID usage values and their meanings.
final int usbHidUsage;