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This check compares the return type specified in the @return annotation of a function
or method doc comment with the types returned by the function and raises an issue if they
mismatch.
The expression defined('WPRP_PLUGIN_SLU...te_webhook_url : false; of type string|false adds false to the return on line 59 which is incompatible with the return type declared by the abstract method HM\BackUpWordPress\Webhook_Service::get_url of type string. It seems like you forgot to handle an error condition.
This check compares the return type specified in the
@return
annotation of a function or method doc comment with the types returned by the function and raises an issue if they mismatch.