I'm using ubuntu 15.04. While doing
npm install fsevents
npm WARN optional Skipping failed optional dependency /chokidar/fsevents:
npm WARN notsup Not compatible with your operating system or architecture: firstname.lastname@example.org
npm WARN email@example.com No repository field.
I was facing the same issue with this dependecy when building other application.
Just for the sake of knowledge and to people who are not well used to NPM, and thus uncertain about how their applications will behave:
fsevents is an API in OS X allows applications to register for notifications of changes to a given directory tree. Running:
npm install --no-optional
Will do the trick, with no drawbacks.