Rubocop example

.rubocop.yml

AllCops:
  Include:
    - '**/Rakefile'
    - '**/config.ru'
    - 'lib/tasks/**/*'
  Exclude:
    - bin/*
    - db/schema.rb
    - vendor/bundle/**/*
  TargetRubyVersion: 2.3

Rails:
  Enabled: true

# We prefer clarity (and seachability) over concise/DRY migrations.
Metrics/AbcSize:
  Exclude:
    - db/migrate/*

# We don't care about method length, since we check method cyclomatic
# complexity.
Metrics/MethodLength:
  Enabled: false
Metrics/ClassLength:
    Enabled: false
Metrics/ModuleLength:
    Enabled: false

# Trailing commas make for clearer diffs because the last line won't appear
# to have been changed, as it would if it lacked a comma and had one added.
Style/TrailingCommaInArguments:
  EnforcedStyleForMultiline: comma
Style/TrailingCommaInLiteral:
  EnforcedStyleForMultiline: comma

# Cop supports --auto-correct.
# Configuration parameters: PreferredDelimiters.
Style/PercentLiteralDelimiters:
  PreferredDelimiters:
    # Using `[]` for string arrays instead of `()`, since normal arrays are
    # indicated with `[]` not `()`.
    '%w': '[]'
    '%W': '[]'
    '%i': '[]'

Style/Documentation:
  Exclude:
    - app/helpers/**/*
    - db/**/*

Rails/TimeZone:
  EnforcedStyle: 'flexible'