/usr/share/fish/completions/function.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 8 9 10 11 | complete -c function -s d -l description --description "Set function description" -x
complete -c function -xa "(functions -n)" --description "Function"
complete -c function -xa "(builtin -n)" --description "Builtin"
complete -c function -s j -l on-job-exit --description "Make the function a job exit event handler" -x
complete -c function -s p -l on-process-exit --description "Make the function a process exit event handler" -x
complete -c function -s s -l on-signal --description "Make the function a signal event handler" -x
complete -c function -s v -l on-variable --description "Make the function a variable update event handler" -x
complete -c function -s e -l on-event --description "Make the function a generic event handler" -xa 'fish_prompt fish_command_not_found'
complete -c function -s a -l argument-names --description "Specify named arguments"
complete -c function -s S -l no-scope-shadowing --description "Do not shadow variable scope of calling function"
complete -c function -s w -l wraps --description "Inherit completions from the given command"
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