update build script

frontend/scripts/build.js

@@ -1,4 +1,4 @@
-'use strict';
+
 
 // Do this as the first thing so that any code reading it knows the right env.
 process.env.BABEL_ENV = 'production';
@@ -138,6 +138,9 @@ checkBrowsers(paths.appPath, isInteractive)
 function build(previousFileSizes) {
   console.log('Creating an optimized production build...');
 
+  const { publicPath, ...rest } = config.output;
+  config.output = rest;
+
   const compiler = webpack(config);
   return new Promise((resolve, reject) => {
     compiler.run((err, stats) => {