This handy little module checks if the currently checked out branch needs squashing. It uses a native git command to count the number of unique commits the branch has (read: commits not present on develop).
Install using npm:
npm install squashed --save-dev
Then from inside the squashed npm package folder
(node_modules/squashed/), do:
npm link
Now simply type "squashed" into the terminal from any Git folder to see if you need to squash those commits or not!