Sane - better file watcher
Before, I used Gulp not because it is a great task runner, but because it could watch files. Then I saw that it watches files with Sane, which was the library that my workflow actually needed.
Negative globs don't work
Using negative globs didn't work in my case. Sane was watching all the directories, which made me create several explicit watching instances. Without doing so, Sane will watch every node_modules directory it finds, which is extremely RAM expensive.
New files are watched
I don't know how Gulp was using Sane, but while I use it, newly created files was not watched. With Sane this is not an issue.