brew: "Homebrew Shell Completion" instructions not working on macOS 10.14.2

I followed the bash instructions here: https://docs.brew.sh/Shell-Completion but kept getting the error

nuvemfs 🔥 source ~/.bash_profile
-bash: /usr/local/etc/bash_completion.d/*: No such file or directory

which isn’t so cool. Replacing it with

if type brew 2&>/dev/null; then
    source "$(brew --prefix)/etc/bash_completion"
else
  echo "run: brew install git bash-completion"
fi

works just fine however.