Drupal 8.6.x is now in a beta phase, which means we will now undertake disruptive cleanup tasks like adjusting coding standards. The main standards change in this release cycle will be the adoption of Prettier code formatter.

Work is underway to patch core for this change, which will touch many files, so be aware that you will need to reroll patches for conflicts and adjust them to use the new code style rules set by Prettier by running yarn prettier.