update to webpack4 (#889)

build/webpack.dev.conf.js

@@ -9,7 +9,7 @@ const HtmlWebpackPlugin = require('html-webpack-plugin')
 const FriendlyErrorsPlugin = require('friendly-errors-webpack-plugin')
 const portfinder = require('portfinder')
 
-function resolve (dir) {
+function resolve(dir) {
   return path.join(__dirname, '..', dir)
 }
 
@@ -17,8 +17,12 @@ const HOST = process.env.HOST
 const PORT = process.env.PORT && Number(process.env.PORT)
 
 const devWebpackConfig = merge(baseWebpackConfig, {
+  mode: 'development',
   module: {
-    rules: utils.styleLoaders({ sourceMap: config.dev.cssSourceMap, usePostCSS: true })
+    rules: utils.styleLoaders({
+      sourceMap: config.dev.cssSourceMap,
+      usePostCSS: true
+    })
   },
   // cheap-module-eval-source-map is faster for development
   devtool: config.dev.devtool,
@@ -39,7 +43,7 @@ const devWebpackConfig = merge(baseWebpackConfig, {
     proxy: config.dev.proxyTable,
     quiet: true, // necessary for FriendlyErrorsPlugin
     watchOptions: {
-      poll: config.dev.poll,
+      poll: config.dev.poll
     }
   },
   plugins: [
@@ -47,8 +51,6 @@ const devWebpackConfig = merge(baseWebpackConfig, {
       'process.env': require('../config/dev.env')
     }),
     new webpack.HotModuleReplacementPlugin(),
-    new webpack.NamedModulesPlugin(), // HMR shows correct file names in console on update.
-    new webpack.NoEmitOnErrorsPlugin(),
     // https://github.com/ampedandwired/html-webpack-plugin
     new HtmlWebpackPlugin({
       filename: 'index.html',
@@ -57,7 +59,7 @@ const devWebpackConfig = merge(baseWebpackConfig, {
       favicon: resolve('favicon.ico'),
       title: 'vue-element-admin',
       path: config.dev.assetsPublicPath + config.dev.assetsSubDirectory
-    }),
+    })
   ]
 })
 
@@ -73,14 +75,20 @@ module.exports = new Promise((resolve, reject) => {
       devWebpackConfig.devServer.port = port
 
       // Add FriendlyErrorsPlugin
-      devWebpackConfig.plugins.push(new FriendlyErrorsPlugin({
-        compilationSuccessInfo: {
-          messages: [`Your application is running here: http://${devWebpackConfig.devServer.host}:${port}`],
-        },
-        onErrors: config.dev.notifyOnErrors
-        ? utils.createNotifierCallback()
-        : undefined
-      }))
+      devWebpackConfig.plugins.push(
+        new FriendlyErrorsPlugin({
+          compilationSuccessInfo: {
+            messages: [
+              `Your application is running here: http://${
+                devWebpackConfig.devServer.host
+              }:${port}`
+            ]
+          },
+          onErrors: config.dev.notifyOnErrors
+            ? utils.createNotifierCallback()
+            : undefined
+        })
+      )
 
       resolve(devWebpackConfig)
     }