Switch node version in the current zsh session, depending on an env var

.zprofile

export N_SESSION_NODE_VERSION=18


# Then, in your PHPStorm or Webstorm project settings you can configure the 
# Terminal to override this value via N_SESSION_NODE_VERSION_OVERRIDE, e.g.:
# N_SESSION_NODE_VERSION_OVERRIDE=16
# 

.zshrc

export N_NODE_VERSION=${N_SESSION_NODE_VERSION_OVERRIDE:-$N_SESSION_NODE_VERSION}

if [[ $(node --version) == "v$N_NODE_VERSION"* ]]; then
  echo "Current node version is: $(node --version). N_SESSION_NODE_VERSION=${N_NODE_VERSION}"
else
  echo "Switching node version to '${N_NODE_VERSION}'"
  n "${N_NODE_VERSION}"
fi