The reason I did the check is that NodeList gets converted into an Array via the $$ function. NodeLists are read-only and always contain Element elements, so it is safe to call addEventListener on them without the check. Arrays are not read-only and the array elements are not safe from reassignment.
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I like that you monkey-patch
Array#on- but is there ever an instance that aNodeListreturned fromquerySelectorwouldn't return anElement?What I'm trying to ask is:
Is
if (el instanceof Element)a necessary check?The reason I did the check is that
NodeListgets converted into anArrayvia the$$function.NodeLists are read-only and always containElementelements, so it is safe to calladdEventListeneron them without the check.Arrays are not read-only and the array elements are not safe from reassignment.