Merge pull request #3 from simon360/fix-file-level-comments

Don't fail on file-level comments

Author: tregagnon

src/index.js

@@ -3,7 +3,7 @@ module.exports = function(source) {
   this.cacheable();
   var result = {};
   css.parse(source).stylesheet.rules
-    .filter(rule => rule.selectors.some(sel => sel === ':root'))
+    .filter(rule => rule.selectors && rule.selectors.some(sel => sel === ':root'))
     .forEach(rule => rule.declarations
       .filter(decl => decl.type === 'declaration' && decl.property.indexOf('--') === 0)
       .forEach(decl => result[decl.property] = decl.value));

test/simple.js

@@ -33,3 +33,6 @@ check('should import from :root among multiple selectors',
 check('should not break when there is a comment',
   ':root { --theme: red; /* important info */ --accent: blue }',
   { '--accent': 'blue', '--theme': 'red' })
+check('should not break when there is a file-level comment',
+  '/* file info */ :root { --theme: red; /* important info */ --accent: blue }',
+  { '--accent': 'blue', '--theme': 'red' })