update to webpack4.0 (#136)

* dev

* update

* fix

* refine

* add ScriptExtHtmlWebpackPlugin

* update

* format

* refine

* typo

* format

* docs

* docs

build/build.js

@@ -19,13 +19,15 @@ rm(path.join(config.build.assetsRoot, config.build.assetsSubDirectory), err => {
   webpack(webpackConfig, (err, stats) => {
     spinner.stop()
     if (err) throw err
-    process.stdout.write(stats.toString({
-      colors: true,
-      modules: false,
-      children: false,
-      chunks: false,
-      chunkModules: false
-    }) + '\n\n')
+    process.stdout.write(
+      stats.toString({
+        colors: true,
+        modules: false,
+        children: false,
+        chunks: false,
+        chunkModules: false
+      }) + '\n\n'
+    )
 
     if (stats.hasErrors()) {
       console.log(chalk.red('  Build failed with errors.\n'))
@@ -33,9 +35,11 @@ rm(path.join(config.build.assetsRoot, config.build.assetsSubDirectory), err => {
     }
 
     console.log(chalk.cyan('  Build complete.\n'))
-    console.log(chalk.yellow(
-      '  Tip: built files are meant to be served over an HTTP server.\n' +
-      '  Opening index.html over file:// won\'t work.\n'
-    ))
+    console.log(
+      chalk.yellow(
+        '  Tip: built files are meant to be served over an HTTP server.\n' +
+          "  Opening index.html over file:// won't work.\n"
+      )
+    )
   })
 })