Only step through your gulpfile, not Node JS or plugin code! Use Paste this pattern in Chrome Dev Tools under Settings > Blackbox Debug your gulpfile with node --inspect-brk .

Finds greys by checking if R, G, B values are equal

Regular expression to replace and remove ID at the end for Google Analytics

Simple email validation regexpr to handle subdomains and other stuff. See example

Change the delimited from "," to something else if required.