Automatic `nvm use` on cd'ing into directory for macOS zsh

auto-nvmrc.sh

# Generated by ChatGPT

# Keep track of last used .nvmrc path
typeset -g NVM_LAST_USED=""

# Function to find closest .nvmrc in current dir or above
function nvm_find_rc() {
  local dir="$PWD"
  while [[ "$dir" != "/" ]]; do
    if [[ -f "$dir/.nvmrc" ]]; then
      # Print full absolute path
      echo "$(readlink -f "$dir/.nvmrc")"
      return
    fi
    dir="${dir:h}"  # zsh shorthand for parent dir
  done
}

# Hook for directory changes
function nvm_auto_use() {
  local rc
  rc=$(nvm_find_rc)

  # Skip if no .nvmrc
  [[ -z "$rc" ]] && return

  # Skip if same as last used
  [[ "$rc" == "$NVM_LAST_USED" ]] && return

  # Use the version in the nearest .nvmrc
  echo "nvm using $(cat "$rc") from $rc"
  nvm use
  NVM_LAST_USED="$rc"
}

# Register hook
autoload -Uz add-zsh-hook
add-zsh-hook chpwd nvm_auto_use

# Also run on initial shell start
nvm_auto_use

Recommended, clean way to use:

1. Add file to e.g. ~/dotfiles/auto-nvmrc.sh
2. Add line source ~/dotfiles/auto-nvmrc.sh to ~/.zshrc