stylelint.config.js

module.exports = {
  ignoreFiles: [
    '/app',
    '/development',
    '/dist',
    '/docs',
    '/fonts',
    '/images',
    '/node_modules',
    '/notices',
    '/test',
  ],

  rules: {
    // stylelint-config-standard

    'at-rule-empty-line-before': [
      'always',
      {
        except: ['blockless-after-same-name-blockless', 'first-nested'],
        ignore: ['after-comment'],
      },
    ],
    'at-rule-name-case': 'lower',
    'at-rule-name-space-after': 'always-single-line',
    'at-rule-semicolon-newline-after': 'always',
    'block-closing-brace-empty-line-before': 'never',
    'block-closing-brace-newline-after': 'always',
    'block-closing-brace-newline-before': 'always-multi-line',
    'block-closing-brace-space-before': 'always-single-line',
    'block-opening-brace-newline-after': 'always-multi-line',
    'block-opening-brace-space-after': 'always-single-line',
    'block-opening-brace-space-before': 'always',
    'color-hex-case': 'lower',
    'color-hex-length': 'short',
    'comment-empty-line-before': [
      'always',
      {
        except: ['first-nested'],
        ignore: ['stylelint-commands'],
      },
    ],
    // 'comment-whitespace-inside': 'always',
    'custom-property-empty-line-before': [
      'always',
      {
        except: ['after-custom-property', 'first-nested'],
        ignore: ['after-comment', 'inside-single-line-block'],
      },
    ],
    'declaration-bang-space-after': 'never',
    'declaration-bang-space-before': 'always',
    'declaration-block-semicolon-newline-after': 'always-multi-line',
    'declaration-block-semicolon-space-after': 'always-single-line',
    'declaration-block-semicolon-space-before': 'never',
    'declaration-block-single-line-max-declarations': 1,
    'declaration-block-trailing-semicolon': 'always',
    'declaration-colon-newline-after': 'always-multi-line',
    'declaration-colon-space-after': 'always-single-line',
    'declaration-colon-space-before': 'never',
    'declaration-empty-line-before': [
      'always',
      {
        except: ['after-declaration', 'first-nested'],
        ignore: ['after-comment', 'inside-single-line-block'],
      },
    ],
    'function-comma-newline-after': 'always-multi-line',
    'function-comma-space-after': 'always-single-line',
    'function-comma-space-before': 'never',
    'function-max-empty-lines': 0,
    'function-name-case': 'lower',
    'function-parentheses-newline-inside': 'always-multi-line',
    'function-parentheses-space-inside': 'never-single-line',
    'function-whitespace-after': 'always',
    indentation: 2,
    'length-zero-no-unit': true,
    // 'max-empty-lines': 1,
    'media-feature-colon-space-after': 'always',
    'media-feature-colon-space-before': 'never',
    'media-feature-name-case': 'lower',
    'media-feature-parentheses-space-inside': 'never',
    'media-feature-range-operator-space-after': 'always',
    'media-feature-range-operator-space-before': 'always',
    'media-query-list-comma-newline-after': 'always-multi-line',
    'media-query-list-comma-space-after': 'always-single-line',
    'media-query-list-comma-space-before': 'never',
    'no-eol-whitespace': true,
    'no-missing-end-of-source-newline': true,
    'number-leading-zero': 'always',
    'number-no-trailing-zeros': true,
    'property-case': 'lower',
    'rule-empty-line-before': [
      'always-multi-line',
      {
        except: ['first-nested'],
        ignore: ['after-comment'],
      },
    ],
    'selector-attribute-brackets-space-inside': 'never',
    'selector-attribute-operator-space-after': 'never',
    'selector-attribute-operator-space-before': 'never',
    'selector-combinator-space-after': 'always',
    'selector-combinator-space-before': 'always',
    'selector-descendant-combinator-no-non-space': true,
    'selector-list-comma-newline-after': 'always',
    'selector-list-comma-space-before': 'never',
    'selector-max-empty-lines': 0,
    'selector-pseudo-class-case': 'lower',
    'selector-pseudo-class-parentheses-space-inside': 'never',
    'selector-pseudo-element-case': 'lower',
    'selector-pseudo-element-colon-notation': 'double',
    'selector-type-case': 'lower',
    'unit-case': 'lower',
    'value-list-comma-newline-after': 'always-multi-line',
    'value-list-comma-space-after': 'always-single-line',
    'value-list-comma-space-before': 'never',
    'value-list-max-empty-lines': 0,

    // custom rules

    'value-no-vendor-prefix': true,
    'value-list-comma-newline-before': 'never-multi-line',
    'no-unknown-animations': true,
  },
};