Replace ts-loader with Babel (#21587)

* Applied prettier to relevant webpack configs

* Replaced ng-annotate with babel-plugin-angularjs-annotate

… and replaced ts-loader with @preset/typescript

* Removed redundant import

… that is problematic with Babel's module resolver

* Updated lockfile

* Traspile debug package to es5 for PhantomJS support

* Update babel to latest version

* Remove @babel/poolyfill and url search params polyfill

* Add ts-loader to grafana-ui dependencies

* Update prod webpack build to use cor-js 3

* Applied prettier to relevant webpack configs

* Replaced ng-annotate with babel-plugin-angularjs-annotate

… and replaced ts-loader with @preset/typescript

* Updated lockfile

Co-authored-by: Dominik Prokop <dominik.prokop@grafana.com>

scripts/webpack/webpack.prod.js

@@ -4,15 +4,14 @@ const merge = require('webpack-merge');
 const TerserPlugin = require('terser-webpack-plugin');
 const common = require('./webpack.common.js');
 const path = require('path');
-const ngAnnotatePlugin = require('ng-annotate-webpack-plugin');
 const ForkTsCheckerWebpackPlugin = require('fork-ts-checker-webpack-plugin');
-const HtmlWebpackPlugin = require("html-webpack-plugin");
-const MiniCssExtractPlugin = require("mini-css-extract-plugin");
-const OptimizeCSSAssetsPlugin = require("optimize-css-assets-webpack-plugin");
+const HtmlWebpackPlugin = require('html-webpack-plugin');
+const MiniCssExtractPlugin = require('mini-css-extract-plugin');
+const OptimizeCSSAssetsPlugin = require('optimize-css-assets-webpack-plugin');
 
 module.exports = merge(common, {
   mode: 'production',
-  devtool: "source-map",
+  devtool: 'source-map',
 
   entry: {
     dark: './public/sass/grafana.dark.scss',
@@ -20,33 +19,62 @@ module.exports = merge(common, {
   },
 
   module: {
-    rules: [{
-        test: /\.tsx?$/,
-        enforce: 'pre',
-        exclude: /node_modules/,
-        use: {
-          loader: 'tslint-loader',
-          options: {
-            emitErrors: true,
-            typeCheck: false,
-          }
-        }
-      },
+    // Note: order is bottom-to-top and/or right-to-left
+    rules: [
       {
         test: /\.tsx?$/,
         exclude: /node_modules/,
-        use: {
-          loader: 'ts-loader',
-          options: {
-            transpileOnly: true
+        use: [
+          {
+            loader: 'babel-loader',
+            options: {
+              cacheDirectory: true,
+              babelrc: false,
+              // Note: order is top-to-bottom and/or left-to-right
+              plugins: [
+                [
+                  require('@rtsao/plugin-proposal-class-properties'),
+                  {
+                    loose: true,
+                  },
+                ],
+                '@babel/plugin-proposal-nullish-coalescing-operator',
+                '@babel/plugin-proposal-optional-chaining',
+                '@babel/plugin-syntax-dynamic-import', // needed for `() => import()` in routes.ts
+                'angularjs-annotate',
+              ],
+              // Note: order is bottom-to-top and/or right-to-left
+              presets: [
+                [
+                  '@babel/preset-env',
+                  {
+                    targets: {
+                      browsers: 'last 3 versions',
+                    },
+                    useBuiltIns: 'entry',
+                    corejs: 3,
+                    modules: false,
+                  },
+                ],
+                '@babel/preset-typescript',
+                '@babel/preset-react',
+              ],
+            },
           },
-        },
+          {
+            loader: 'tslint-loader',
+            options: {
+              emitErrors: true,
+              typeCheck: false,
+            },
+          },
+        ],
       },
       require('./sass.rule.js')({
         sourceMap: false,
-        preserveUrl: false
-      })
-    ]
+        preserveUrl: false,
+      }),
+    ],
   },
   optimization: {
     nodeEnv: 'production',
@@ -54,40 +82,39 @@ module.exports = merge(common, {
       new TerserPlugin({
         cache: false,
         parallel: true,
-        sourceMap: true
+        sourceMap: true,
       }),
-      new OptimizeCSSAssetsPlugin({})
-    ]
+      new OptimizeCSSAssetsPlugin({}),
+    ],
   },
   plugins: [
     new ForkTsCheckerWebpackPlugin({
       checkSyntacticErrors: true,
     }),
     new MiniCssExtractPlugin({
-      filename: "grafana.[name].[hash].css"
+      filename: 'grafana.[name].[hash].css',
     }),
-    new ngAnnotatePlugin(),
     new HtmlWebpackPlugin({
       filename: path.resolve(__dirname, '../../public/views/error.html'),
       template: path.resolve(__dirname, '../../public/views/error-template.html'),
       inject: false,
       excludeChunks: ['dark', 'light'],
-      chunksSortMode: 'none'
+      chunksSortMode: 'none',
     }),
     new HtmlWebpackPlugin({
       filename: path.resolve(__dirname, '../../public/views/index.html'),
       template: path.resolve(__dirname, '../../public/views/index-template.html'),
       inject: false,
       excludeChunks: ['manifest', 'dark', 'light'],
-      chunksSortMode: 'none'
+      chunksSortMode: 'none',
     }),
-    function () {
-      this.hooks.done.tap('Done', function (stats) {
+    function() {
+      this.hooks.done.tap('Done', function(stats) {
         if (stats.compilation.errors && stats.compilation.errors.length) {
           console.log(stats.compilation.errors);
           process.exit(1);
         }
       });
-    }
-  ]
+    },
+  ],
 });