Source-map: Parse as JSON.

lib/index.js

@@ -164,6 +164,8 @@ function getOptions(options) {
   };
 
   options.success = function(css, sourceMap) {
+    sourceMap = JSON.parse(sourceMap);
+
     endStats(options, sourceMap);
 
     if (success) {
@@ -254,7 +256,7 @@ module.exports.renderSync = function(options) {
   options = getOptions(options);
   output = options.file ? binding.renderFileSync(options) : binding.renderSync(options);
 
-  endStats(options, options.stats.sourceMap);
+  endStats(options, JSON.parse(options.stats.sourceMap));
   return output;
 };
 
@@ -296,7 +298,7 @@ module.exports.renderFile = function(options) {
       var dir = path.dirname(outFile);
       var sourceMapFile = path.resolve(dir, options.sourceMap);
 
-      fs.writeFile(sourceMapFile, sourceMap, function(err) {
+      fs.writeFile(sourceMapFile, JSON.stringify(sourceMap), function(err) {
         if (err) {
           return options.error(err);
         }

test/api.js

@@ -421,8 +421,7 @@ describe('api', function() {
         stats: stats,
         sourceMap: true,
         success: function() {
-          var map = JSON.parse(stats.sourceMap);
-          assert.equal(map.sources[0], 'index.scss');
+          assert.equal(stats.sourceMap.sources[0], 'index.scss');
           done();
         }
       });
@@ -516,8 +515,7 @@ describe('api', function() {
         sourceMap: true
       });
 
-      var map = JSON.parse(stats.sourceMap);
-      assert.equal(map.sources[0], 'index.scss');
+      assert.equal(stats.sourceMap.sources[0], 'index.scss');
       done();
     });
   });