use sources from webpack-sources

Author: sokra

ExtractedModule.js

@@ -2,8 +2,8 @@
 	MIT License http://www.opensource.org/licenses/mit-license.php
 	Author Tobias Koppers @sokra
 */
-var SourceMapSource = require("webpack/lib/SourceMapSource");
-var RawSource = require("webpack/lib/RawSource");
+var SourceMapSource = require("webpack-sources").SourceMapSource;
+var RawSource = require("webpack-sources").RawSource;
 
 function ExtractedModule(identifier, originalModule, source, sourceMap, addtitionalInformation, prevModules) {
 	this._identifier = identifier;

index.js

@@ -2,7 +2,7 @@
 	MIT License http://www.opensource.org/licenses/mit-license.php
 	Author Tobias Koppers @sokra
 */
-var ConcatSource = require("webpack/lib/ConcatSource");
+var ConcatSource = require("webpack-sources").ConcatSource;
 var async = require("async");
 var ExtractedModule = require("./ExtractedModule");
 var Chunk = require("webpack/lib/Chunk");