Extract Babel config

babel.config.js

@@ -0,0 +1,20 @@
+module.exports = {
+    babelrcRoots: [
+        // Keep the root as a root
+        '.'
+    ],
+    presets: [
+        [
+            '@babel/preset-env',
+            {
+                useBuiltIns: 'usage',
+                corejs: 3
+            }
+        ]
+    ],
+    plugins: [
+        '@babel/plugin-proposal-class-properties',
+        '@babel/plugin-proposal-private-methods',
+        'babel-plugin-dynamic-import-polyfill'
+    ]
+};

package.json

@@ -77,22 +77,6 @@
     "workbox-core": "^5.1.4",
     "workbox-precaching": "^5.1.4"
   },
-  "babel": {
-    "presets": [
-      [
-        "@babel/preset-env",
-        {
-          "useBuiltIns": "usage",
-          "corejs": 3
-        }
-      ]
-    ],
-    "plugins": [
-      "@babel/plugin-proposal-class-properties",
-      "@babel/plugin-proposal-private-methods",
-      "babel-plugin-dynamic-import-polyfill"
-    ]
-  },
   "browserslist": [
     "last 2 Firefox versions",
     "last 2 Chrome versions",

webpack.common.js

@@ -1,7 +1,6 @@
 const path = require('path');
 const { CleanWebpackPlugin } = require('clean-webpack-plugin');
 const CopyPlugin = require('copy-webpack-plugin');
-const packageConfig = require('./package.json');
 const WorkboxPlugin = require('workbox-webpack-plugin');
 const HtmlWebpackPlugin = require('html-webpack-plugin');
 
@@ -93,10 +92,7 @@ module.exports = {
                 test: /\.js$/,
                 exclude: /node_modules[\\/](?!@uupaa[\\/]dynamic-import-polyfill|date-fns|epubjs|flv.js|libarchive.js)/,
                 use: [{
-                    loader: 'babel-loader',
-                    options: {
-                        presets: packageConfig.babel.presets
-                    }
+                    loader: 'babel-loader'
                 }]
             },
             /* modules that Babel breaks when transforming to ESM */
@@ -105,7 +101,6 @@ module.exports = {
                 use: [{
                     loader: 'babel-loader',
                     options: {
-                        presets: packageConfig.babel.presets,
                         plugins: [
                             '@babel/transform-modules-umd'
                         ]