According to Set up your SharePoint framework development environment, I need to install
node.js and then use its command to download further package (yo and gulp) from github. I installed node success with the
.msi installer. But yo and gulp have been installed with some warning.
However my dev server cannot direct access Internet and Github. I fail on almost every step. (e.g. cannot find module '@microsoft/sp-build-web')
Is there any article talk about offline environment or any official source saying github is essential?