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Make sure that the required parameters are present #908
Make sure that the required parameters are present for "on" and "off" method like it is specified in https://hammerjs.github.io/jsdoc/Manager.html#on and https://hammerjs.github.io/jsdoc/Manager.html#off
Currently, if you call Hammer.on('tap', undefined) it will try to fire the "undefined" event handler.