Can't use znap pull in a script

[kud]

In order to maintain my os, I've done a script like that:

if [ ! -d "$HOME/.znap" ]; then
  git clone --depth=1 https://github.com/marlonrichert/zsh-snap.git ~/.znap
  source ~/.znap/install.zsh
else
  znap pull
fi

However, here znap is not recognised in my script. And it is in my shell. Any idea why?

[kud]

Okay like that it works

if [ ! -d "$HOME/.znap" ]; then
  git clone --depth=1 https://github.com/marlonrichert/zsh-snap.git ~/.znap
  source ~/.znap/install.zsh
else
  zstyle ':znap:*' repos-dir ~/.zsh
  source ~/.znap/znap.zsh
  znap pull
fi