Tab completion for aliased sub commands in zsh: alias gco='git checkout'

Question

I have an alias: alias gco='git checkout'

How can I add tab completion as if I had typed git checkout?

For my alias g='git' I use compdef g='git'.

I've been trying to use compdef but I've not had any success.

Answer 1

Disable this option and you're also good...

# don't expand aliases _before_ completion has finished
#   like: git comm-[tab]
# setopt complete_aliases

Answer 2

You don’t need to do anything, especially compdef g='git', it should work without any configuration. You would need something only if you used function in place of an alias.