def list_config_files() -> List[Text]:
return [<EOL>os.path.join(os.path.dirname(__file__), '<STR_LIT>'),<EOL>os.getenv(ENVIRONMENT_VARIABLE, '<STR_LIT>'),<EOL>]<EOL>
This function returns the list of configuration files to load.

This is a callable so the configuration can be reloaded with files that
changed in between.