fix(ci): configure stylelint

.stylelintrc.js

@@ -0,0 +1,125 @@
+'use strict'
+
+module.exports = {
+  extends: 'stylelint-config-recommended',
+  rules: {
+    'alpha-value-notation': [
+      'percentage',
+      {
+        exceptProperties: [
+          'opacity',
+          'fill-opacity',
+          'flood-opacity',
+          'stop-opacity',
+          'stroke-opacity',
+        ],
+      },
+    ],
+    'at-rule-empty-line-before': [
+      'always',
+      {
+        except: ['blockless-after-same-name-blockless', 'first-nested'],
+        ignore: ['after-comment'],
+      },
+    ],
+    'at-rule-no-vendor-prefix': true,
+    'color-function-notation': 'modern',
+    'color-hex-length': 'short',
+    'comment-empty-line-before': [
+      'always',
+      {
+        except: ['first-nested'],
+        ignore: ['stylelint-commands'],
+      },
+    ],
+    'comment-whitespace-inside': 'always',
+    'custom-property-empty-line-before': [
+      'always',
+      {
+        except: ['after-custom-property', 'first-nested'],
+        ignore: ['after-comment', 'inside-single-line-block'],
+      },
+    ],
+    'custom-media-pattern': [
+      '^([a-z][a-z0-9]*)(-[a-z0-9]+)*$',
+      {
+        message: (name) =>
+          `Expected custom media query name "${name}" to be kebab-case`,
+      },
+    ],
+    'custom-property-pattern': [
+      '^([a-z][a-z0-9]*)(-[a-z0-9]+)*$',
+      {
+        message: (name) =>
+          `Expected custom property name "${name}" to be kebab-case`,
+      },
+    ],
+    'declaration-block-no-redundant-longhand-properties': true,
+    'declaration-block-single-line-max-declarations': 1,
+    'declaration-empty-line-before': [
+      'always',
+      {
+        except: ['after-declaration', 'first-nested'],
+        ignore: ['after-comment', 'inside-single-line-block'],
+      },
+    ],
+    'font-family-name-quotes': 'always-where-recommended',
+    'function-name-case': 'lower',
+    'function-url-quotes': 'always',
+    'hue-degree-notation': 'angle',
+    'import-notation': 'url',
+    'keyframe-selector-notation': 'percentage-unless-within-keyword-only-block',
+    'keyframes-name-pattern': [
+      '^([a-z][a-z0-9]*)(-[a-z0-9]+)*$',
+      {
+        message: (name) => `Expected keyframe name "${name}" to be kebab-case`,
+      },
+    ],
+    'length-zero-no-unit': [
+      true,
+      {
+        ignore: ['custom-properties'],
+      },
+    ],
+    'lightness-notation': 'percentage',
+    'media-feature-name-no-vendor-prefix': true,
+    'media-feature-range-notation': 'context',
+    'number-max-precision': 4,
+    'property-no-vendor-prefix': true,
+    'rule-empty-line-before': [
+      'always-multi-line',
+      {
+        except: ['first-nested'],
+        ignore: ['after-comment'],
+      },
+    ],
+    'selector-attribute-quotes': 'always',
+    'selector-class-pattern': [
+      '^([a-z][a-z0-9]*)(-[a-z0-9]+)*$',
+      {
+        message: (selector) =>
+          `Expected class selector "${selector}" to be kebab-case`,
+      },
+    ],
+    'selector-id-pattern': [
+      '^([a-z][a-z0-9]*)(-[a-z0-9]+)*$',
+      {
+        message: (selector) =>
+          `Expected id selector "${selector}" to be kebab-case`,
+      },
+    ],
+    'selector-no-vendor-prefix': true,
+    'selector-not-notation': 'complex',
+    'selector-pseudo-element-colon-notation': 'double',
+    'selector-type-case': 'lower',
+    'shorthand-property-no-redundant-values': true,
+    'value-keyword-case': 'lower',
+    'value-no-vendor-prefix': [
+      true,
+      {
+        // `-webkit-box` is allowed as standard. See https://www.w3.org/TR/css-overflow-3/#webkit-line-clamp
+        ignoreValues: ['box', 'inline-box'],
+      },
+    ],
+  },
+}