stylelint-config.json

{
    "plugins": [
        "stylelint-order"
    ],
    "rules": {
        "color-hex-case": "lower",
        "color-named": "never",
        "color-no-invalid-hex": true,

        "function-calc-no-unspaced-operator": true,
        "function-comma-space-after": "always-single-line",
        "function-comma-space-before": "never",
        "function-name-case": "lower",
        "function-url-quotes": "always",
        "function-whitespace-after": "always",

        "number-leading-zero": "always",
        "number-no-trailing-zeros": true,
        "length-zero-no-unit": true,

        "string-no-newline": true,
        "string-quotes": "single",

        "unit-case": "lower",
        "unit-no-unknown": true,
        "unit-whitelist": [ "px", "%", "deg", "ms", "em", "vh", "vw" ],

        "value-list-comma-space-after": "always",
        "value-list-comma-space-before": "never",

        "custom-property-empty-line-before": [
            "always",
            {
                "except": [ "first-nested" ],
                "ignore": [ "after-comment" ]
            }
        ],

        "shorthand-property-no-redundant-values": true,

        "property-case": "lower",

        "declaration-empty-line-before": [
            "always",
            {
                "except": [ "first-nested", "after-declaration" ],
                "ignore": [ "after-comment" ]
            }
        ],

        "declaration-block-no-duplicate-properties": [
            true,
            {
                "ignore": [ "consecutive-duplicates-with-different-values" ]
            }
        ],
        "declaration-block-trailing-semicolon": "always",
        "declaration-block-single-line-max-declarations": 1,
        "declaration-block-semicolon-space-before": "never",
        "declaration-block-semicolon-space-after": "always-single-line",
        "declaration-block-semicolon-newline-before": "never-multi-line",
        "declaration-block-semicolon-newline-after": "always-multi-line",
        "declaration-property-value-blacklist": [
            { "/.*/": [ "initial" ] },
            { "message": "The `initial` value is not supported in IE." }
        ],

        "block-closing-brace-newline-after": "always",
        "block-closing-brace-newline-before": "always-multi-line",
        "block-opening-brace-newline-after": "always-multi-line",
        "block-opening-brace-space-before": "always-multi-line",

        "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-max-id": 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-pseudo-element-no-unknown": true,
        "selector-type-case": "lower",

        "selector-list-comma-newline-after": "always",

        "rule-empty-line-before": [
            "always",
            {
                "except": [ "first-nested" ],
                "ignore": [ "after-comment" ]
            }
        ],

        "at-rule-empty-line-before": [
            "always",
            {
                "except": [ "first-nested", "blockless-after-blockless" ],
                "ignore": [ "after-comment" ]
            }
        ],

        "comment-empty-line-before": [
            "always",
            {
                "except": [ "first-nested" ],
                "ignore": [ "after-comment", "stylelint-commands" ]
            }
        ],

        "indentation": 4,
        "no-eol-whitespace": true,
        "no-extra-semicolons": true,
        "no-missing-end-of-source-newline": true,

        "order/order": [
            {
                "type": "at-rule",
                "name": "extend"
            },
            {
                "type": "at-rule",
                "name": "include"
            },
            "custom-properties",
            "declarations",
            "rules",
            "at-rules"
        ],
        "order/properties-alphabetical-order": true
    }
}