Merge pull request facebook#910 from andrewdavey/react-transform-sour…

…ce-map

Add sourceMap option to react-tools transform

main.js

@@ -2,15 +2,40 @@
 
 var visitors = require('./vendor/fbtransform/visitors');
 var transform = require('jstransform').transform;
+var Buffer = require('buffer').Buffer;
 
 module.exports = {
-  transform: function(code, options) {
-    var visitorList;
-    if (options && options.harmony) {
-      visitorList = visitors.getAllVisitors();
-    } else {
-      visitorList = visitors.transformVisitors.react;
+  React: React,
+  transform: function(input, options) {
+    options = options || {};
+    var visitorList = getVisitors(options.harmony);
+    var result = transform(visitorList, input, options);
+    var output = result.code;
+    if (options.sourceMap) {
+      var map = inlineSourceMap(
+        result.sourceMap,
+        input,
+        options.sourceFilename
+      );
+      output += '\n' + map;
     }
-    return transform(visitorList, code).code;
+    return output;
   }
 };
+
+function getVisitors(harmony) {
+  if (harmony) {
+    return visitors.getAllVisitors();
+  } else {
+    return visitors.transformVisitors.react;
+  }
+}
+
+function inlineSourceMap(sourceMap, sourceCode, sourceFilename) {
+  var json = sourceMap.toJSON();
+  json.sources = [sourceFilename];
+  json.sourcesContent = [sourceCode];
+  var base64 = Buffer(JSON.stringify(json)).toString('base64');
+  return '//# sourceMappingURL=data:application/json;base64,' +
+         base64;
+}