Upgrade front-end building related dependencies

package.json

@@ -34,12 +34,10 @@
     "vuejs-paginate": "^2.1.0"
   },
   "devDependencies": {
-    "@babel/core": "^7.4.4",
-    "@babel/plugin-proposal-optional-catch-binding": "^7.2.0",
-    "@babel/plugin-syntax-dynamic-import": "^7.2.0",
-    "@babel/plugin-transform-runtime": "^7.4.4",
-    "@babel/preset-env": "^7.4.4",
-    "@babel/preset-typescript": "^7.3.3",
+    "@babel/core": "^7.6.0",
+    "@babel/plugin-transform-runtime": "^7.6.0",
+    "@babel/preset-env": "^7.6.0",
+    "@babel/preset-typescript": "^7.6.0",
     "@gplane/tsconfig": "^1.0.0",
     "@types/echarts": "^4.1.9",
     "@types/execa": "^0.9.0",
@@ -47,43 +45,43 @@
     "@types/jest": "^24.0.12",
     "@types/jquery": "^3.3.29",
     "@types/semver": "^6.0.0",
-    "@types/webpack": "^4.4.29",
+    "@types/webpack": "^4.39.1",
     "@typescript-eslint/eslint-plugin": "^1.7.0",
     "@typescript-eslint/parser": "^1.7.0",
     "@vue/test-utils": "^1.0.0-beta.29",
-    "autoprefixer": "^9.5.1",
+    "autoprefixer": "^9.6.1",
     "babel-eslint": "^10.0.1",
     "babel-jest": "^24.5.0",
-    "babel-loader": "^8.0.5",
+    "babel-loader": "^8.0.6",
     "babel-plugin-dynamic-import-node": "^2.2.0",
     "babel-plugin-import": "^1.11.0",
-    "cache-loader": "^2.0.1",
-    "codecov": "^3.1.0",
-    "copy-webpack-plugin": "^5.0.1",
-    "css-loader": "^2.1.0",
-    "cssnano": "^4.1.10",
+    "cache-loader": "^4.1.0",
+    "codecov": "^3.6.0",
+    "copy-webpack-plugin": "^5.0.4",
+    "css-loader": "^3.2.0",
     "eslint": "^5.16.0",
     "eslint-config-gplane": "^5.1.3",
     "eslint-formatter-beauty": "^3.0.0",
     "eslint-plugin-vue": "^5.2.2",
-    "execa": "^1.0.0",
+    "execa": "^2.0.4",
     "expose-loader": "^0.7.5",
     "file-loader": "^3.0.1",
-    "fs-extra": "^7.0.1",
+    "fs-extra": "^8.1.0",
     "jest": "^24.7.1",
     "jest-extended": "^0.11.1",
-    "mini-css-extract-plugin": "^0.6.0",
+    "mini-css-extract-plugin": "^0.8.0",
     "node-sass": "^4.12.0",
+    "optimize-css-assets-webpack-plugin": "^5.0.3",
     "postcss-loader": "^3.0.0",
     "rimraf": "^2.6.3",
     "sass-loader": "^7.1.0",
-    "semver": "^6.0.0",
-    "style-loader": "^0.23.1",
+    "semver": "^6.3.0",
+    "style-loader": "^1.0.0",
     "stylus": "^0.54.5",
     "stylus-loader": "^3.0.2",
     "ts-node": "^8.1.0",
     "typescript": "^3.4.1",
-    "url-loader": "^1.1.2",
+    "url-loader": "^2.1.0",
     "vue-jest": "^4.0.0-beta.2",
     "vue-loader": "^15.7.0",
     "vue-template-compiler": "^2.6.10",
@@ -91,7 +89,7 @@
     "webpack-cli": "^3.3.1",
     "webpack-dev-server": "^3.3.1",
     "webpack-manifest-plugin": "^2.0.4",
-    "webpackbar": "^3.1.5"
+    "webpackbar": "^4.0.0"
   },
   "browserslist": [
     "> 1%",

postcss.config.js

@@ -3,6 +3,5 @@
 module.exports = {
   plugins: [
     require('autoprefixer'),
-    require('cssnano'),
   ],
 }

webpack.config.js

@@ -3,6 +3,8 @@ const fs = require('fs')
 const webpack = require('webpack')
 const VueLoaderPlugin = require('vue-loader/lib/plugin')
 const MiniCssExtractPlugin = require('mini-css-extract-plugin')
+const TerserJSPlugin = require('terser-webpack-plugin')
+const OptimizeCSSAssetsPlugin = require('optimize-css-assets-webpack-plugin')
 const CopyWebpackPlugin = require('copy-webpack-plugin')
 const WebpackBar = require('webpackbar')
 const ManifestPlugin = require('webpack-manifest-plugin')
@@ -77,7 +79,7 @@ const config = {
       {
         test: /((node_modules.*)|element)\.(sa|sc|c)ss$/,
         use: [
-          devMode ? 'style-loader?hmr=true' : MiniCssExtractPlugin.loader,
+          devMode ? 'style-loader' : MiniCssExtractPlugin.loader,
           { loader: 'css-loader', options: { importLoaders: 2 } },
           'postcss-loader',
           'sass-loader',
@@ -143,6 +145,9 @@ const config = {
   resolve: {
     extensions: ['.js', '.ts', '.vue', '.json'],
   },
+  optimization: {
+    minimizer: [new TerserJSPlugin({}), new OptimizeCSSAssetsPlugin({})],
+  },
   devtool: devMode ? 'cheap-module-eval-source-map' : false,
   devServer: {
     headers: {