use_node() {
  layout node

  local node_version=$1

  if [ "$node_version" == "package.json" ]; then
    # Requires jq: `brew install jq`
    node_version=`jq --raw-output .engines.node package.json | tr -d "<=> "`
  fi

  local node_path=${NODE_DIR:-/usr/local/n/versions/node}

  if [ -x "$node_path/$node_version/bin/node" ]; then
    PATH_add $node_path/$node_version/bin
  elif [ -x "$node_path/v$node_version/bin/node" ]; then
    # Support nvm users (nvm prefixes versions with 'v')
    PATH_add $node_path/v$node_version/bin
  else
    echo "!!! Node.js version $node_version is not installed"
  fi
}