Gah. I need to skim better. Thanks. Here is a translation for anyone else who uses fish. Just hit it with a :%s/^\n//g to fix the formatting.

# Rename this file to match the name of the function

# e.g. ~/.config/fish/functions/ya.fish

# or, add the lines to the 'config.fish' file.

function ya

    set tmp (mktemp -t "yazi-cwd.XXXXX")

    yazi --cwd-file="$tmp"

    if set cwd (cat -- "$tmp") && [ -n "$cwd" ] && [ "$cwd" != "$PWD" ]

        cd -- "$cwd"

    end

    rm -f -- "$tmp"

end