I tried to clone the repo directly and run "npm install" , then I got this error. My node version is 8.9. 1  Then I tried yarn install, it worked! <img width="654" alt="2017-12-17 12 31 04" src="https://user-images.githubusercontent.com/16200288/34076565-2d84e21e-e326-11e7-822b-1c4fda009ec6.png">