npm install -g generator-angular gives error (requires a peer of)

Question

Learning Node and trying to install generator-angular

running npm install -g generator-angular

WARN EPEERINVALID gen

Answer 1

npm@3 no longer install peerDependencies automatically. This warning is shown as a result of this change.

If you are not running the tests you do not have to install karma.
If you are, npm install karma>=0.9.0 manually.

https://docs.npmjs.com/files/package.json#peerdependencies