Gulp.js, watch task runs twice when saving files

Question

Given the following piece of code from my gulpfile.js, everytime I save or change a file, the task runs twice instead of one single time, why is that? I just want it to run

Answer 1

I write here my experience, maybe helps someone. This cost me 1 week to detect. I made every possible debug. Removed files, reinstalled clean node packages. Removed Sublime plugins. Reported as a bug to Sublime github and plugins github pages.

My solution Close dropbox if open. I use Dropbox for my project and work there. When Dropbox is open, tasks run twice because Dropbox detects file change and does something. Specially Typescript files, i don't know why.