Create a module registration file in Magento

Modules need two files in order to be registered & enabled in Magento.

The first is in the root of the module, and is named registration.php. This is the file that exposes this as a Magento module at the PHP-layer.

It’s a PHP best practice nowadays to declare strict types at the top of each of your PHP files with declare(strict_types=1);. Doing so ensures that variables have a specified type, otherwise a TypeError is thrown, and stops the execution of further processing.

Let’s call the ComponentRegistrar class, which comes from Magento Framework’s Component folder. This class ha...