Use sync rendering of Sass

Author: devversion

tools/package-tools/gulp/build-scss-task.ts

@@ -10,7 +10,7 @@ const gulpCleanCss = require('gulp-clean-css');
 export function buildScssTask(outputDir: string, sourceDir: string, minifyOutput = false) {
   return () => {
     return src(join(sourceDir, '**/*.scss'))
-      .pipe(gulpDartSass().on('error', gulpDartSass.logError))
+      .pipe(gulpDartSass.sync().on('error', gulpDartSass.logError))
       .pipe(gulpIf(minifyOutput, gulpCleanCss()))
       .pipe(dest(outputDir));
   };