fix: ignore dollar signs (sass variables) in declaration-property-value-no-unknown

Author: limonte

index.json

@@ -13,7 +13,11 @@
   ],
   "customSyntax": "postcss-scss",
   "rules": {
-    "declaration-property-value-no-unknown": true,
+    "declaration-property-value-no-unknown": [true, {
+      "ignoreProperties": {
+        "/.+/": "/.+\\$.+/"
+      }
+    }],
     "alpha-value-notation": null,
     "annotation-no-unknown": null,
     "at-rule-no-unknown": null,

test/index.js

@@ -44,7 +44,7 @@ test('order/properties-order (stylelint-config-property-sort-order-smacss)', asy
 
 test('declaration-property-value-no-unknown', async () => {
   const output = await stylelint.lint({
-    code: 'a { max-width: auto; }\n',
+    code: 'a { max-width: auto; box-shadow: 0 0 0 $red; }\n',
     config,
   })
   assert.strictEqual(output.results[0].warnings.length, 1)