Rename function "" to match the regular expression ^[a-z][a-z0-9_]*$.
This error is not actually correct, the rules in the coding standards of drupal are that we follow the snake_case only in .module files or in drupal 7 context. In modern drupal (8+), in classes it should be camelCase instead.
Hello @borisson and welcome to community!
Thank you for raising awareness on this topic.
Indeed it seems that the convention changed since Drupal 8, as they mention in their documentation:
Drupal - PHP coding standards - Naming Conventions / Functions and Variables
Functions should be named using lowercase, and words should be separated with an underscore.
Drupal - PHP coding standards - Naming Conventions / Classes, Methods and Properties
- Methods and class properties should use lowerCamel naming. In Drupal 8, properties of configuration entities are exempt of these conventions. Those properties are allowed to use underscores.
I created a ticket to follow-up on this.
Thank you again for pointing this out.
Best regards,
Rudy