Select JS chunk for rendering (#138)

fixes a bug with webpack 4 + mini-css-extract-plugin

Author: Ambroos

index.js

@@ -132,7 +132,9 @@ var findAsset = function(src, compilation, webpackStatsJson) {
   // Webpack outputs an array for each chunk when using sourcemaps
   if (chunkValue instanceof Array) {
     // Is the main bundle always the first element?
-    chunkValue = chunkValue[0];
+    chunkValue = chunkValue.find(function(filename) {
+      return /\.js$/.test(filename);
+    });
   }
   return compilation.assets[chunkValue];
 };
@@ -145,8 +147,10 @@ var getAssetsFromCompilation = function(compilation, webpackStatsJson) {
 
     // Webpack outputs an array for each chunk when using sourcemaps
     if (chunkValue instanceof Array) {
-      // Is the main bundle always the first element?
-      chunkValue = chunkValue[0];
+      // Is the main bundle always the first JS element?
+      chunkValue = chunkValue.find(function(filename) {
+        return /\.js$/.test(filename);
+      });
     }
 
     if (compilation.options.output.publicPath) {