.stylelintrc

{
    "plugins": [
        "stylelint-csstree-validator"
    ],
    "rules": {
        "csstree/validator": true,
        "at-rule-empty-line-before": [ "always",
          {"except": [ "blockless-after-blockless"], ignore: ["after-comment", "inside-block"]}
        ],
        "at-rule-name-case": "lower",
        "at-rule-name-space-after": "always-single-line",
        "at-rule-no-unknown": null, # Enabled for non-scss in grunt.
        "at-rule-semicolon-newline-after": "always",
        "at-rule-semicolon-space-before": "never",
        "block-closing-brace-newline-after": "always",
        "block-closing-brace-newline-before": "always",
        "block-closing-brace-space-before": "always-single-line",
        "block-no-empty": true,
        "block-opening-brace-newline-after": "always",
        "block-opening-brace-space-after": "always-single-line",
        "block-opening-brace-space-before": "always",
        "color-hex-case": ["lower", { "severity": "warning" }],
        "color-hex-length": ["short", { "severity": "warning" }],
        "color-no-invalid-hex": true,
        "declaration-bang-space-after": "never",
        "declaration-bang-space-before": "always",
        "declaration-block-no-duplicate-properties": true,
        "declaration-block-no-shorthand-property-overrides": true,
        "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-no-important": true,
        "font-family-no-duplicate-names": true,
        "function-calc-no-unspaced-operator": true,
        "function-comma-newline-after": "always-multi-line",
        "function-comma-space-after": "always-single-line",
        "function-comma-space-before": "never",
        "function-linear-gradient-no-nonstandard-direction": true,
        "function-max-empty-lines": 0,
        "function-name-case": "lower",
        "function-parentheses-newline-inside": "always-multi-line",
        "function-parentheses-space-inside": "never-single-line",
        "function-url-scheme-blacklist": ["data"],
        "function-whitespace-after": "always",
        "indentation": 4,
        "keyframe-declaration-no-important": true,
        "length-zero-no-unit": [true, { "severity": "warning" }],
        "max-empty-lines": 2,
        "max-line-length": [132, { "severity": "warning" }],
        "media-feature-colon-space-after": "always",
        "media-feature-colon-space-before": "never",
        "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-empty-source": true,
        "no-eol-whitespace": true,
        "no-extra-semicolons": [true, { "severity": "warning" }],
        "no-invalid-double-slash-comments": true,
        "no-unknown-animations": true,
        "property-case": "lower",
        "property-no-unknown": true,
        "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-list-comma-newline-after": "always",
        "selector-list-comma-space-before": "never",
        "selector-max-empty-lines": 0,
        "selector-pseudo-class-case": "lower",
        "selector-pseudo-class-no-unknown": true,
        "selector-pseudo-class-parentheses-space-inside": "never",
        "selector-pseudo-element-case": "lower",
        "selector-pseudo-element-no-unknown": true,
        "selector-type-case": "lower",
        "selector-type-no-unknown": true,
        "string-no-newline": true,
        "time-min-milliseconds": 100,
        "unit-blacklist": ["pt"],
        "unit-case": "lower",
        "unit-no-unknown": true,
        "value-keyword-case": ["lower", {"ignoreKeywords": ["/(@|$)/"]}],
        "value-list-comma-newline-after": "always-multi-line",
        "value-list-comma-space-after": "always-single-line",
        "value-list-comma-space-before": "never",
  }
}