NPM: windows-build-tools

node-gyp is really useful and annoying. npm install fails if Python 2.7 and a C# Compiler is missing.
You could use choco to get and install the missing packages or simply install another npm package:

[code lang=bash]
npm -g windows-build-tools

will install Phyton 2.7 and the Visual Studio Build tools that are required by node-gyp.