The installed node version is 10.15.2 and the installed npm version is 5.8.0 which causes npm to output the following error:
npm WARN npm npm does not support Node.js v10.15.2 npm WARN npm You should probably upgrade to a newer version of node as we npm WARN npm can't make any promises that npm will work with this version. npm WARN npm Supported releases of Node.js are the latest release of 4, 6, 7, 8, 9. npm WARN npm You can find the latest version at https://nodejs.org/