[react-packager][streamline oss] Move open sourced JS source to react-native-github

Libraries/JavaScriptAppEngine/Initialization/loadSourceMap.js

@@ -0,0 +1,24 @@
+/**
+ * Copyright 2004-present Facebook. All Rights Reserved.
+ *
+ * @providesModule loadSourceMap
+ */
+
+'use strict';
+
+var SourceMapConsumer = require('SourceMap').SourceMapConsumer;
+
+var sourceMapInstance;
+
+function loadSourceMap() {
+  if (sourceMapInstance !== undefined) {
+    return sourceMapInstance;
+  }
+  if (!global.RAW_SOURCE_MAP) {
+    return null;
+  }
+  sourceMapInstance = new SourceMapConsumer(global.RAW_SOURCE_MAP);
+  return sourceMapInstance;
+}
+
+module.exports = loadSourceMap;