I'm not sure what that line is supposed to do, but it's not valid and causes uglifyJS to break.
this._debug({cardType, showBack});
^
SyntaxError: Unexpected token punc «,», expected punc «:»
at JS_Parse_Error.get (eval at (/usr/local/lib/node_modules/uglify-js/tools/node.js:28:1), :86:23)
at /usr/local/lib/node_modules/uglify-js/bin/uglifyjs:384:39
at time_it (/usr/local/lib/node_modules/uglify-js/bin/uglifyjs:620:15)
at /usr/local/lib/node_modules/uglify-js/bin/uglifyjs:345:9
at tryToString (fs.js:455:3)
at FSReqWrap.readFileAfterClose [as oncomplete] (fs.js:442:12)
Invalid javascript at https://github.com/vic10us/cc-form/blob/master/cc-form.html#L166
I'm not sure what that line is supposed to do, but it's not valid and causes uglifyJS to break.