Stylelint configuration for Sage theme

.stylelintrc.js

module.exports = {
  'extends': 'stylelint-config-standard',
  'rules': {
    'no-empty-source': null,
    'at-rule-no-unknown': [
      true,
      {
        'ignoreAtRules': [
          'extend',
          'at-root',
          'debug',
          'warn',
          'error',
          'if',
          'else',
          'for',
          'each',
          'while',
          'mixin',
          'include',
          'content',
          'return',
          'function',
          'tailwind',
          'apply',
          'responsive',
          'variants',
          'screen',
        ],
      },
    ],
    'at-rule-empty-line-before': [
      'always',
      {
        except: [
          'blockless-after-same-name-blockless',
          'first-nested',
        ],
        ignore: ['after-comment'],
        ignoreAtRules: ['include']
      }
    ],
    'font-family-name-quotes': 'always-unless-keyword',
    'function-url-quotes': 'always',
    'selector-attribute-quotes': 'always',
    'string-quotes': 'double',
    'at-rule-no-vendor-prefix': true,
    'media-feature-name-no-vendor-prefix': true,
    'property-no-vendor-prefix': true,
    'selector-no-vendor-prefix': true,
    'value-no-vendor-prefix': true,
    'max-nesting-depth': [
      5,
      {
        'ignore': [
          'blockless-at-rules',
          'pseudo-classes',
        ],
      },
    ],
    'selector-max-compound-selectors': 5,
    'max-line-length': 80,
  },
};

update-stylelint.sh

npm install --save-dev stylelint@9.10.1

Update stylelint package to the latest version first.