The expression return self::getInstance...alias, $throwException) could return the type null which is incompatible with the type-hinted return string. Consider adding an additional type-check to rule them out.
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31
}
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/**
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* @param AliasService $service
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*/
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public static function setInstance(AliasService $service)
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{
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self::$aliasService = $service;
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}
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/**
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* @return AliasService
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*/
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protected static function getInstance(): AliasService
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{
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return self::$aliasService ?? new AliasService([]);
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