This plugin, once installed, adds a composer uninstall command that will uninstall (not remove from composer.*) all packages on your filesystem. It basically does the opposite of composer install which takes the required packages and installs them into directories, this will delete those directories.
composer global config repositories.composer-uninstall git git@github.com:aubreypwd/composer-uninstall.git
composer global require aubreypwd/composer-uninstall:dev-master@devTo update, after you've installed, use:
composer global update aubreypwd/composer-uninstall