.stylelintrc.json

{
  "extends": ["stylelint-config-standard", "stylelint-config-recommended-scss"],
  "plugins": ["stylelint-scss"],
  "customSyntax": "postcss-scss",
  "rules": {
    "at-rule-no-unknown": null,
    "at-rule-empty-line-before": null,
    "color-hex-case": null,
    "color-hex-length": null,
    "declaration-empty-line-before": null,
    "declaration-block-single-line-max-declarations": 2,
    "length-zero-no-unit": null,
    "no-duplicate-selectors": null,
    "no-invalid-position-at-import-rule": null,
    "rule-empty-line-before": [
      "always-multi-line",
      {
        "except": ["after-single-line-comment", "first-nested"],
        "ignore": ["after-comment", "first-nested"]
      }
    ],
    "selector-pseudo-element-colon-notation": "double",

    "scss/at-rule-no-unknown": true,
    "scss/at-else-closing-brace-newline-after": "always-last-in-chain",
    "scss/at-else-if-parentheses-space-before": "always",
    "scss/no-duplicate-dollar-variables": [
      true,
      {
        "ignoreInsideAtRules": ["if", "else", "mixin", "function", "while"]
      }
    ],
    "scss/at-function-parentheses-space-before": "never",
    "scss/at-if-closing-brace-newline-after": "always-last-in-chain",
    "scss/at-mixin-argumentless-call-parentheses": "always",
    "scss/at-mixin-parentheses-space-before": "never",
    "scss/dollar-variable-colon-space-after": "at-least-one-space",
    "scss/dollar-variable-colon-newline-after": "always-multi-line",
    "scss/dollar-variable-no-missing-interpolation": true,
    "scss/double-slash-comment-whitespace-inside": "always",
    "scss/declaration-nested-properties-no-divided-groups": true,
    "scss/operator-no-unspaced": true,
    "scss/selector-no-redundant-nesting-selector": true,
    "selector-class-pattern": "^[a-zA-Z-_]+$"
  }
}