I went recently through the process of adding SASS support and the just-released official 4th version of Bootstrap, so I thought I will share. The process is not a rocket-science, although you must complete quite a few steps to make it run well together.Versions Just for sake of clarity, what my cli version query (ng -v) produces is:Angular CLI: 1.6.6 Node: 8.9.4 OS: win32 x64 Angular: 5.1.2 I am not sure how similar this is for the previous versions, but I hope there are not many differences,....