How to get the customer's data on the frontend checkout page's client side (with JavaScript)?

[dmitry_fedyuk (Dmitrii Fediuk)]

• How to get the customer’s data on the frontend checkout page’s client side (with JavaScript) using the Magento_Customer/js/model/customer object?
• How is the Magento_Customer/js/customer-data object implemented and used?
• How to get the customer’s data on the frontend checkout page’s client side (with JavaScript) using the window.customerData object?
• The difference between window.customerData, Magento_Customer/js/customer-data, and Magento_Customer/js/model/customer on a frontend checkout page.

[dmitry_fedyuk (Dmitrii Fediuk)]

See also:

• How is the frontend checkout configuration passed to the client side (JavaScript)?
• The checkout-config-provider-tagged articles
• How does a payment method pass its configuration to the client side (JavaScript)?
• frontend-checkout-customer-data - tagged articles.