Fix high memory usage (#173)

closes #174

Author: bew

lib/plugin.js

@@ -56,7 +56,14 @@ ManifestPlugin.prototype.apply = function(compiler) {
     var seed = this.opts.seed || {};
 
     var publicPath = this.opts.publicPath != null ? this.opts.publicPath : compilation.options.output.publicPath;
-    var stats = compilation.getStats().toJson();
+    var stats = compilation.getStats().toJson({
+        // Disable data generation of everything we don't use
+        all: false,
+        // Add asset Information
+        assets: true,
+        // Show cached assets (setting this to `false` only shows emitted files)
+        cachedAssets: true,
+    });
 
     var files = compilation.chunks.reduce(function(files, chunk) {
       return chunk.files.reduce(function (files, path) {