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Trying to select any option with checkbox exception is thrown:
Error in ./Listbox class Listbox - inline template:20:20 caused by: event is not defined
Option and checkbox should be selected
In components/listbox/listbox.ts, line 36 function onCheckboxClick() is missing $event parameter as well as same file, line 299 function does not have event parameter, making event variable in line 313 undefined.