How is the current card's network detected for the bank card networks bar?

Context: How is the bank card networks bar implemented?

Step 1. Magento_Payment/template/payment/cc-form.html

Step 2. Magento_Payment/js/payment/cc-form::initialize()

Step 3. Magento_Payment/js/model/credit-card-validation/credit-card-number-validator

Step 4. Magento_Payment/js/model/credit-card-validation/credit-card-number-validator/credit-card-type