I have multiple lib files in an an index.html file, that are loaded in proper sequence for an app I am running.
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Modifying the javascript code is not fixing the root cause of the problem so this could happen again as soon as you introduce a new JavaScript file.
You have at least few choices for a permanent fix - they involve changing the build so that this cannot happen in the future, even if a semi-colon is missing:
; between the files you are concatenating. This is usually a simple one-line change depending on how you are concatenating the files.