fix: init lint (#1309)

* migrate to stylelint; init linting
* stylelint fix: block-no-empty
* stylelint fix: no-eol-whitespace
* stylelint fix: no-extra-semicolons
* stylelint fix: max-empty-lines
* stylelint fix: selector-pseudo-element-case
* stylelint fix: number-leading-zero
* stylelint fix: length-zero-no-unit
* stylelint fix: block-closing-brace-empty-line-before
* stylelint fix: declaration-block-trailing-semicolon
* stylelint fix: declaration-colon-space-after
* stylelint fix: block-opening-brace-space-before
* stylelint fix: selector-pseudo-element-colon-notation
* stylelint fix: declaration-bang-space-before

.stylelintrc.yml

@@ -0,0 +1,30 @@
+rules:
+  block-closing-brace-empty-line-before: never
+  block-no-empty: true
+  block-opening-brace-space-before: always
+  color-no-invalid-hex: true
+  declaration-bang-space-before: always
+  declaration-block-trailing-semicolon: always
+  declaration-colon-space-after: always
+  declaration-colon-space-before: never
+  #declaration-property-value-blacklist: [ { '/^outline$/': 'none' }]
+  font-family-no-duplicate-names: true
+  #indentation: 4
+  keyframe-declaration-no-important: true
+  length-zero-no-unit: true
+  max-empty-lines: 2
+  #no-duplicate-selectors: true
+  no-empty-source: true
+  no-eol-whitespace: true
+  no-extra-semicolons: true
+  number-leading-zero: always
+  number-no-trailing-zeros: true
+  property-case: lower
+  selector-list-comma-space-after: always-single-line
+  selector-list-comma-space-before: never
+  selector-pseudo-class-no-unknown: true
+  selector-pseudo-element-case: lower
+  selector-pseudo-element-colon-notation: double
+  string-no-newline: true
+  unit-case: lower
+  unit-no-unknown: true

.travis.yml

@@ -12,8 +12,8 @@ script:
   - npm run build
 jobs:
   include:
-  #- stage: Lint and Test
-    #script: gulp test:generateCIConfig && gulp test:visual
+  - stage: Lint and Test
+    script: npm run lint # && gulp test:generateCIConfig && gulp test:visual
   - stage: Pre-release
     if: branch = master
     before_deploy: