In my case, i installed node with NVM and after installing z Shell, node and nvm command didn't worked. So what worked for me was installing nvm again with this command :
wget https://raw.githubusercontent.com/creationix/nvm/master/install.sh | bash
sudo zsh install.sh
Above commands installed nvm again, since node was already installed, it added the node path automatically in .zshrc file and everything worked.