Modules not loading config files

Autoloading constants file, as well as other non-class files, will be a new feature for the Autoloader class. This will be implemented by autoloading "files", as opposed to autoloading classes.

Are you using Composer? If yes, then there is a workaround. In your composer.json, add the files array to your autoload section.

Code:

"autoload": {
    "files": [
        "path/to/constants.php"
    ]
}

Then in your terminal, just run ` composer dump-autoload`