[mhw]

If you want to use standard’s defaults, but add your own tweaks:

  # .rubocop.yml
  inherit_from:
    - https://raw.githubusercontent.com/testdouble/standard/master/config/base.yml
  
  Style/TrailingCommaInArrayLiteral:
    Enabled: true
    EnforcedStyleForMultiline: consistent_comma
  
  Style/TrailingCommaInHashLiteral:
    Enabled: true
    EnforcedStyleForMultiline: consistent_comma
  
  # add further tweaks as needed

and just use rubocop’s CLI