'zsh alias completion (trailing space) breaks with functions

When you create an alias with a trailing space like alias sudo='sudo ', it instructs zsh or bash to traverse the next argument for an alias, so if you also have alias aup='apt update', you could say sudo aup and it'll run apt update as root.

This does not, however, work when you have a function. For example:

_installer_helper() {
  local RETVAL
  command "$@"
  RETVAL="$?"
  hash -r
  return "$RETVAL"
}

alias apt='_installer_helper apt'

# (zsh only) this ensures apt subcommands still complete correctly
setopt complete_aliases

alias sudo='sudo '

Not what I want:

$ sudo apt update
sudo: _installer_helper: command not found
$

How do I get this to work properly in both bash and zsh? (Yes, the setopt command is only run by zsh.)

bashzsh


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