/usr/share/fish/completions/service.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 | # Fist argument is the names of the service, i.e. a file in /etc/init.d
complete -c service -n "test (count (commandline -poc)) = 1" -xa "(__fish_print_service_names)" --description "Service name"
#The second argument is what action to take with the service
complete -c service -n "test (count (commandline -poc)) -gt 1" -xa '$__fish_service_commands'
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