I want to override country drop-down in custom checkout page. In further i want to add my custom function on change of country drop-down.
Provide information to get help: what custom checkout is? is there custom theme installed and used? What other module are enabled?
It work in default by changing
vendor/magento/module-checkout/view/frontend/layout/checkout_index_index.xml in theme/module and additional js file need to be added as ui_component.