/usr/share/fish/completions/lsusb.fish is in fish-common 2.4.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | complete -c lsusb -s v -l verbose --description "Increase verbosity (show descriptors)"
complete -x -c lsusb -s s -a '(__fish_complete_lsusb)' --description "Show only devices with specified device and/or bus numbers (in decimal)"
complete -c lsusb -s d --description "Show only devices with the specified vendor and product ID numbers (in hexadecimal)"
complete -c lsusb -s D -l device --description "Selects which device lsusb will examine"
complete -c lsusb -s t -l tree --description "Dump the physical USB device hierarchy as a tree"
complete -c lsusb -s V -l version --description "Show version of program"
complete -c lsusb -s h -l help --description "Show usage and help"
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