Fix.

node_modules/source-map/source-map.js

@@ -1,8 +0,0 @@
-/*
- * Copyright 2009-2011 Mozilla Foundation and contributors
- * Licensed under the New BSD license. See LICENSE.txt or:
- * http://opensource.org/licenses/BSD-3-Clause
- */
-exports.SourceMapGenerator = require('./lib/source-map-generator').SourceMapGenerator;
-exports.SourceMapConsumer = require('./lib/source-map-consumer').SourceMapConsumer;
-exports.SourceNode = require('./lib/source-node').SourceNode;