My SCSS lint preferences

.scss-lint.yml

# Docs @ https://github.com/causes/scss-lint/blob/master/lib/scss_lint/linter/README.md

linters:
  BorderZero:
    enabled: false # nerdery - no existing standard for 'none' or '0'

  CapitalizationInSelector:
    enabled: false # nerdery - capitalization in camelCase is possible

  ColorKeyword:
    enabled: true # nerdery - disallow color keywords

  Comment:
    enabled: false # nerdery - no prefrence for '//' or '/* */' comment style

  DebugStatement:
    enabled: true # nerdery - no @debug should be left in the code

  DeclarationOrder:
    enabled: false # nerdery - no preference on @extend as it's disallowed

  DuplicateProperty:
    enabled: true # nerdery - should never have duplicate attributes

  ElsePlacement:
    enabled: true
    style: same_line # nerdery - @else statements should be on the same line as curly braces

  EmptyLineBetweenBlocks:
    enabled: true # nerdery - line break between rule blocks is required
    ignore_single_line_blocks: true # nerdery - except when rules are on a single line

  EmptyRule:
    enabled: true # nerdery - no empty rules should exist

  FinalNewline:
    enabled: false # nerdery - not a front-end standard
    present: false # nerdery - still not a front-end standard

  HexLength:
    enabled: true # nerdery - always use 6 digit hex
    style: long # nerdery - always use 6 digit hex

  HexNotation:
    enabled: true # nerdery - always use lowercase
    style: lowercase # nerdery - always use lowercase

  HexValidation:
    enabled: true # nerdery - always use valid hex

  IdWithExtraneousSelector:
    enabled: true # nerdery - while not technically a standard it's a good practice

  Indentation:
    enabled: true # nerdery - use 4 spaces
    character: space # nerdery - use spaces
    width: 4 # nerdery - use 4 of them

  LeadingZero:
    enabled: false # nerdery - disabled as there is no standards
    style: false # options -  'include_zero' or 'exclude_zero'

  MergeableSelector:
    enabled: true # nerdery - while not technically a standard it's a good practice
    force_nesting: false # nerdery - never ever enforce nesting

  NameFormat:
    enabled: false # nerdery - use nerdery naming standards
    convention: false # options - 'hyphenated_lowercase' or 'BEM', or a regex pattern

  PlaceholderInExtend:
    enabled: false # nerdery - don't use extend so not enabled

  PropertySortOrder:
    enabled: true # nerdery - group by similar type
    order: concentric # nerdery - needs config
    ignore_unspecified: true # nerdery - ignore any properties not specified in the order

  PropertySpelling:
    enabled: true # nerdery - spell properties correctly
    extra_properties: [] # nerdery - if a property doesn't exist in the linter, specify it here

  SelectorDepth:
    enabled: true # nerdery - depth of applicability should be LOW LOW LOW
    max_depth: 2 # nerdery - normally this would be 1 but we need some scenarios (UserContent, .hlist > *) to work without error

  SelectorFormat:
    enabled: true # nerdery - standards use a mix of -, _, and camelCase
    convention: (\w+)(-\w+)?(_\w+)? # hyphenated_lowercase (default) or snake_case, camel_case, BEM, or regex

  Shorthand:
    enabled: false # nerdery - use the longest shorthand, not the shortest shorthand

  SingleLinePerProperty:
    enabled: true # nerdery - one property per line
    allow_single_line_rule_sets: true # nerdery - single line rulesets are ok sometimes

  SingleLinePerSelector:
    enabled: true # nerdery - one selector per line

  SpaceAfterComma:
    enabled: true # nerdery - while not technically a standard it's a good practice

  SpaceAfterPropertyColon:
    enabled: true # nerdery - there should always be a space
    style: one_space # options - 'one_space' or 'no_space', or 'at_least_one_space', or 'aligned'

  SpaceAfterPropertyName:
    enabled: true # nerdery - no space after property name and before colon

  SpaceBeforeBrace:
    enabled: true # nerdery - always a space before the opening brace
    allow_single_line_padding: false # nerdery - don't line up properies on single line rules

  SpaceBetweenParens:
    enabled: true # nerdery - no space by parenthesis
    spaces: 0 # nerdery - 0 spaces

  StringQuotes:
    enabled: true # nerdery - enforce string quotes
    style: double_quotes # nerdery - use double_quotes not single_quotes

  TrailingSemicolon:
    enabled: true # nerdery - there should always be a trailing semi-colon

  UnnecessaryMantissa:
    enabled: true # nerdery - while not technically a standard it's a good practice

  UnnecessaryParentReference:
    enabled: false # nerdery - no preference on parent reference in nesting as it's disallowed

  UrlFormat:
    enabled: true # nerdery - urls should never contain protocols

  UrlQuotes:
    enabled: true # nerdery - urls should always be quoted

  ZeroUnit:
    enabled: true # nerdery - always remove units from 0 values

  Indentation:
    severity: warning
    width: 4