This Magento 2 module forms the base of various other Loki solutions: Loki Checkout, Loki Admin Components, Loki Theme for Luma. It adds Alpine.js to the page, adds container-blocks for other scripts to be added, it adds its own frontend messaging component and its adds an Alpine store for both localStorage and messaging.
Most likely you do not install this module on its own, but require it through other modules.
composer require loki/magento2-base
bin/magento module:enable Loki_Base