gistfile1.js

function extractOriginalEvent( handler ) {
    return function( event ) {
        if ( event.originalEvent ) {
            event = event.originalEvent;
        }
        
        return handler.apply( this, [ event ].concat( Array.prototype.slice.call( arguments, 1 ) ) );
    };
}

var clickHandler = extractOriginalEvent(function( e ) {
    alert( e instanceof MouseEvent );
});

$( document ).on( 'click', clickHandler );