Auto switch node version using fnm with zsh shell

.zshrc

eval "`fnm env`"

# do this after eval fnm env
auto-fnm-use() {
  if [[ -f .nvmrc && -r .nvmrc ]] || [[ -f .node-version && -r .node-version ]]; then
    fnm use
  elif [[ `node -v` != `~/.fnm/aliases/default/bin/node -v` ]]; then
    echo Reverting to node from "`node -v`" to "`~/.fnm/aliases/default/bin/node -v`"
    fnm use default
  fi
}
add-zsh-hook chpwd auto-fnm-use
auto-fnm-use