sourceMappingURL

README.md

@@ -26,10 +26,12 @@ grunt.initConfig({
       closurePath: '/src/to/closure-compiler',
       js: 'static/src/frontend.js',
       jsOutputFile: 'static/js/frontend.min.js',
+      sourceMapUrl: true,
       maxBuffer: 500,
       options: {
         compilation_level: 'ADVANCED_OPTIMIZATIONS',
-        language_in: 'ECMASCRIPT5_STRICT'
+        language_in: 'ECMASCRIPT5_STRICT',
+        create_source_map: 'src.js.map'
       }
     }
   }
@@ -42,6 +44,8 @@ grunt.initConfig({
 
 If `jsOutputFile` property is set, the script will be minified and saved to the file specified. Otherwise it will be output to the command line.
 
+If the `sourceMapUrl` property is set to a truthy value, the sourceMappingURL comment is appended to the generated JS file. If you pass this property as a string value, the sourceMappingURL will be set to that value. Otherwise, boolean true assumes the file name with a .map extension.
+
 `maxBuffer` property
 
 If the buffer returned by closure compiler is more than 200kb, you will get an error saying "maxBuffer exceeded". To prevent this, you can set the maxBuffer to the preffered size you want (in kb)

tasks/closure-compiler.js

@@ -94,6 +94,17 @@ module.exports = function(grunt) {
         done(false);
       }
 
+      // Check to see if we should add the source map comment to end of file
+      if (data.sourceMapUrl && data.options.create_source_map) {
+        if (typeof data.sourceMapUrl == 'boolean') {
+          data.sourceMapUrl = path.basename(data.options.create_source_map);
+        }
+
+        fs.appendFile(data.jsOutputFile, '//# sourceMappingURL=' + data.sourceMapUrl, function (err) {
+          grunt.log.writeln('Could not add sourceMappingURL!');
+        });
+      }
+
       if (stdout) {
         grunt.log.writeln(stdout);
       }