.stylelintrc.json

{
    "extends": "stylelint-config-standard",
    "rules": {
        "indentation": 4,
        "selector-type-no-unknown": [
            true,
            {
                "ignoreTypes": [
                    "/^mat-/"
                ]
            }
        ],
        "selector-pseudo-element-no-unknown": [
            true,
            {
                "ignorePseudoElements": ["ng-deep"]
            }
        ],
        "at-rule-no-unknown": [
            true,
            {
                "ignoreAtRules": ["function", "if", "each", "include", "mixin"]
            }
        ],
        "media-feature-name-no-unknown": [
            true,
            {
              "ignoreMediaFeatureNames": ["display-mode"]
            }
        ],
        "value-keyword-case": null,
        "string-quotes": "single",
        "value-no-vendor-prefix": null,
        "property-no-vendor-prefix": null
    },
    "plugins": ["stylelint-scss"],
    "syntax": "scss"
}