classes.twig

{% attributes.class.add([
  'node',
  'node--type-' ~ node.bundle|class,
  node.promoted ? 'node--promoted',
  node.sticky ? 'node--sticky',
  not node.published ? 'node--unpublished',
  preview ? 'node--preview',
  'node--view-mode-' ~ view_mode|class
]).remove([
  'some-module-class'
]) %}
<article {{attributes}}>

vs.

{% set classes = [
  'node',
  'node--type-' ~ node.bundle|class,
  node.promoted ? 'node--promoted',
  node.sticky ? 'node--sticky',
  not node.published ? 'node--unpublished',
  preview ? 'node--preview',
  'node--view-mode-' ~ view_mode|class
]
%}
<article class="{{ attributes.class.add(classes).remove(['some-module-class']) }}"{{ attributes|without('class') }}>