It seems like $dateRange can also be of type array; however, parameter $dateRange of app\components\visualiza...elper::normalizeRange() does only seem to accept string, maybe add an additional type check?
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Ignorable by Annotation
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If this is a false-positive, you can also ignore this issue in your code via the ignore-type annotation
This check looks for parameters that have been defined for a function or method, but which are not used in the method body.