Furthermore I managed to install and configure the build tools for building node-sass on my windows machine.
node-gyp had to be configured correctly to allow node-sass to compile while doing yarn install - this took way to long.
After trying to do it by hand I found out that
npm install -g windows-build-tools is a bit easier.. but it still did not work.
npm config set msvs_version 2015 Did the job…