build: integrate stylelint

.husky/commit-msg

@@ -3,5 +3,6 @@
 
 [ -n "$CI" ] && exit 0
 
+npx stylelint "**/*.scss"
 npx --no-install commitlint --edit
 npm test -- --coverage

.stylelintrc.json

@@ -0,0 +1,21 @@
+{
+    "extends": "stylelint-config-standard",
+    "rules": {
+        "indentation": 4,
+        "selector-pseudo-element-no-unknown": [
+            true,
+            {
+                "ignorePseudoElements": ["ng-deep"]
+            }
+        ],
+        "at-rule-no-unknown": [
+            true,
+            {
+                "ignoreAtRules": ["function", "if", "each", "include", "mixin"]
+            }
+        ],
+        "value-keyword-case": null
+    },
+    "plugins": ["stylelint-scss"],
+    "syntax": "scss"
+}

package.json

@@ -100,6 +100,9 @@
     "rxjs": "6.6.3",
     "semantic-release": "17.2.3",
     "spectron": "12.0.0",
+    "stylelint": "13.13.1",
+    "stylelint-config-standard": "22.0.0",
+    "stylelint-scss": "3.19.0",
     "ts-node": "8.10.2",
     "tslib": "2.1.0",
     "typescript": "4.1.3",