feat(build): added gulp stylelint task

package.json

@@ -133,7 +133,7 @@
         "changelog": "gulp changelog",
         "publish": "ts-node --project ./scripts/tsconfig.deploy.json ./scripts/deploy/publish-artifacts.ts",
         "linter:lib": "gulp tslint",
-        "linter:styles": "stylelint --syntax scss \"./**/*.scss\"",
+        "linter:styles": "gulp stylelint",
         "server-dev": "webpack-dev-server --config tools/webpack/webpack.config.js",
         "server-dev:badge": "npm run server-dev -- --env.component badge",
         "server-dev:button": "npm run server-dev -- --env.component button",

tools/gulp/tasks/lint.ts

@@ -11,6 +11,11 @@ import { execNodeTask } from '../utils/helpers';
 /* tslint:disable:no-var-requires */
 const madge = require('madge');
 
+/** Globs that matchall SCSS or CSS files that should be linted. */
+const styleGlobs = [
+    'src/**/*.+(css|scss)'
+];
+
 const tsLintBaseFlags = ['-c', 'tslint.json', '--project', './tsconfig.json'];
 
 /** Path to the output of the Mosaic package. */
@@ -23,6 +28,10 @@ task('lint', ['tslint', 'madge']);
 
 task('tslint', execNodeTask('tslint', tsLintBaseFlags));
 
+task('stylelint', execNodeTask(
+    'stylelint', [...styleGlobs, '--config', '.stylelintrc', '--syntax', 'scss']
+));
+
 task('tslint:fix', execNodeTask('tslint', [...tsLintBaseFlags, '--fix']));
 
 task('madge', ['mosaic:clean-build'], () => {