Correctly deep extend the stats file contents

Author: SBoudrias

index.js

@@ -2,6 +2,7 @@ var path = require('path');
 var fs = require('fs');
 var stripAnsi = require('strip-ansi');
 var mkdirp = require('mkdirp');
+var extend = require('deep-extend');
 
 var assets = {};
 var DEFAULT_OUTPUT_FILENAME = 'webpack-stats.json';
@@ -88,7 +89,7 @@ Plugin.prototype.writeOutput = function(compiler, contents) {
  }
  mkdirp.sync(path.dirname(outputFilename));
 
- this.contents = Object.assign(this.contents, contents);
+ this.contents = extend(this.contents, contents);
  fs.writeFileSync(
  outputFilename,
  JSON.stringify(this.contents, null, this.options.indent)

package.json

@@ -28,6 +28,7 @@
  "url": "https://github.com/owais/webpack-bundle-tracker/issues"
  },
  "dependencies": {
+ "deep-extend": "^0.4.1",
  "mkdirp": "^0.5.1",
  "strip-ansi": "^2.0.1"
  }