/usr/share/fish/completions/ncdu.fish is in fish-common 2.2.0-3.
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 | complete -c ncdu -s h -d 'Print help'
complete -c ncdu -s q -d 'Quiet mode. Refresh interval 2 seconds'
complete -c ncdu -s v -d 'Print version'
complete -c ncdu -s x -d 'Same filesystem'
complete -c ncdu -l exclude -d 'Exclude files that match pattern' -r
complete -c ncdu -s X -l exclude-from -d 'Exclude files that match any pattern in file' -r
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