webpack use stict

+'use strict';
+
 /**
  * postcss plugins for both dev and pro
  * @parem et Symbol

+'use strict';
+
 const path = require('path');
 const webpack = require('webpack');
 const WebpackDevServer = require('webpack-dev-server');

+'use strict';
+
 const path = require('path');
 const os = require('os');
 const shelljs = require('shelljs');