I'm fairly new to Magento and am currently running Magento 2.2.1. I am looking for a way to have the configurable sku change to the corresponding simple product sku when the configurable products attributes have been selected.
Out of the box, when choosing options, the images and the price will change, but not SKU.
More information about which elements on the page change when options are selected can be found here:
In order to display product SKU of the selected product, you can create a Plugin (Interceptor) for
Magento\ConfigurableProduct\Block\Product\View\Type\Configurable::getJsonConfig() where you need to add missing SKU for each simple product.
Switching SKU when selecting an option can be implemented in
vendor/magento/module-configurable-product/view/frontend/web/js/configurable.js depending on the type of attribute.
I made free
VCT Change SKU Dynamically module that solve this problem.