Automatically run nvm when entering a directory with a .nvmrc file

.bash_profile

_enter_dir() {
  local git_root
  git_root=$(git rev-parse --show-toplevel 2>/dev/null)

  if [[ "$git_root" == "$PREV_PWD" ]]; then
    return
  elif [[ -n "$git_root" && -f "$git_root/.nvmrc" ]]; then
    nvm use
    NVM_DIRTY=1
  elif [[ "$NVM_DIRTY" == 1 ]]; then
    nvm use default
    NVM_DIRTY=0
  fi
  PREV_PWD="$git_root"
}

export PROMPT_COMMAND=_enter_dir

What is the NVM_DIRTY for?

you can save a second by putting in --silent if you don't need to see the active version (e.g. because Starship already shows it)