chore: add analyzer

package.json

@@ -69,6 +69,7 @@
     "react-logo": "^1.0.15",
     "style-loader": "^0.21.0",
     "webpack": "^4.10.0",
+    "webpack-bundle-analyzer": "^3.3.2",
     "webpack-cli": "^3.0.1",
     "webpack-dev-server": "^3.1.4",
     "xutil": "1"

webpack.config.js

@@ -1,6 +1,7 @@
 'use strict';
 
 const path = require('path');
+const { BundleAnalyzerPlugin } = require('webpack-bundle-analyzer');
 
 const pkg = require('./package');
 
@@ -40,7 +41,12 @@ const config = {
         ]
       }
     ]
-  }
+  },
+  plugins: [],
 };
 
+if (process.env.npm_config_report) {
+  config.plugins.push(new BundleAnalyzerPlugin());
+}
+
 module.exports = config;