how to upgrade to node 12 code example
Example 1: how to update node in ubuntu 18.04
# Using Ubuntu
curl -sL https://deb.nodesource.com/setup_12.x | sudo -E bash -
sudo apt-get install -y nodejs
Example 2: how to upgrade node.js
#linux
sudo npm install n -g
sudo n stable
#windows
#install the .msi from https://nodejs.org/en/download/