update Babel config

babel.config.js

@@ -2,28 +2,57 @@
 module.exports = {
   // use transforms which does not use ES5+ builtins
   plugins: [
+    ['@babel/proposal-class-static-block'],
+    // private instance props in IE8- only with polyfills
     ['@babel/proposal-class-properties'],
+    ['@babel/proposal-private-methods'],
+    ['@babel/proposal-private-property-in-object'],
     ['@babel/proposal-logical-assignment-operators'],
     ['@babel/proposal-nullish-coalescing-operator'],
     ['@babel/proposal-numeric-separator'],
+    ['@babel/proposal-object-rest-spread'],
     ['@babel/proposal-optional-catch-binding'],
     ['@babel/proposal-optional-chaining'],
     ['@babel/transform-member-expression-literals'],
     ['@babel/transform-property-literals'],
     ['@babel/transform-arrow-functions'],
     ['@babel/transform-block-scoped-functions'],
     ['@babel/transform-block-scoping'],
+    // it seems `setClassMethods` unlike `loose` does not work
     ['@babel/transform-classes', { loose: true }],
-    ['@babel/transform-computed-properties', { loose: true }],
-    ['@babel/transform-destructuring', { loose: true }],
+    ['@babel/transform-computed-properties'],
+    ['@babel/transform-destructuring'],
+    ['@babel/transform-exponentiation-operator'],
+    ['@babel/transform-for-of'],
     ['@babel/transform-literals'],
+    ['@babel/transform-new-target'],
+    ['@babel/transform-object-super'],
     ['@babel/transform-parameters'],
+    ['@babel/transform-reserved-words'],
     ['@babel/transform-shorthand-properties'],
-    ['@babel/transform-spread', { loose: true }],
-    ['@babel/transform-template-literals', { loose: true, spec: true }],
-    ['@babel/transform-exponentiation-operator'],
-    ['transform-for-of-as-array'],
+    ['@babel/transform-spread'],
+    ['@babel/transform-template-literals'],
+    ['@babel/transform-unicode-regex'],
     // use it instead of webpack es modules for support engines without descriptors
-    ['transform-es2015-modules-simple-commonjs'],
+    ['@babel/transform-modules-commonjs'],
   ],
+  assumptions: {
+    constantReexports: true,
+    constantSuper: true,
+    enumerableModuleMeta: true,
+    iterableIsArray: true,
+    mutableTemplateObject: true,
+    noClassCalls: true,
+    noDocumentAll: true,
+    noIncompleteNsImportDetection: true,
+    noNewArrows: true,
+    objectRestNoSymbols: true,
+    privateFieldsAsProperties: true,
+    setClassMethods: true,
+    setComputedProperties: true,
+    setPublicClassFields: true,
+    setSpreadProperties: true,
+    skipForOfIteratorClosing: true,
+    superIsCallableConstructor: true,
+  },
 };

package.json

@@ -4,29 +4,38 @@
     "@babel/cli": "^7.17.6",
     "@babel/core": "^7.17.9",
     "@babel/plugin-proposal-class-properties": "^7.16.7",
+    "@babel/plugin-proposal-class-static-block": "^7.17.6",
+    "@babel/plugin-proposal-decorators": "^7.17.9",
     "@babel/plugin-proposal-logical-assignment-operators": "^7.16.7",
     "@babel/plugin-proposal-nullish-coalescing-operator": "^7.16.7",
     "@babel/plugin-proposal-numeric-separator": "^7.16.7",
+    "@babel/plugin-proposal-object-rest-spread": "^7.17.3",
     "@babel/plugin-proposal-optional-catch-binding": "^7.16.7",
     "@babel/plugin-proposal-optional-chaining": "^7.16.7",
+    "@babel/plugin-proposal-private-methods": "^7.16.11",
+    "@babel/plugin-proposal-private-property-in-object": "^7.16.7",
     "@babel/plugin-transform-arrow-functions": "^7.16.7",
     "@babel/plugin-transform-block-scoped-functions": "^7.16.7",
     "@babel/plugin-transform-block-scoping": "^7.16.7",
     "@babel/plugin-transform-classes": "^7.16.7",
     "@babel/plugin-transform-computed-properties": "^7.16.7",
     "@babel/plugin-transform-destructuring": "^7.17.7",
     "@babel/plugin-transform-exponentiation-operator": "^7.16.7",
+    "@babel/plugin-transform-for-of": "^7.16.7",
     "@babel/plugin-transform-literals": "^7.16.7",
     "@babel/plugin-transform-member-expression-literals": "^7.16.7",
+    "@babel/plugin-transform-modules-commonjs": "^7.17.9",
+    "@babel/plugin-transform-new-target": "^7.16.7",
+    "@babel/plugin-transform-object-super": "^7.16.7",
     "@babel/plugin-transform-parameters": "^7.16.7",
     "@babel/plugin-transform-property-literals": "^7.16.7",
+    "@babel/plugin-transform-reserved-words": "^7.16.7",
     "@babel/plugin-transform-shorthand-properties": "^7.16.7",
     "@babel/plugin-transform-spread": "^7.16.7",
     "@babel/plugin-transform-template-literals": "^7.16.7",
+    "@babel/plugin-transform-unicode-regex": "^7.16.7",
     "@onslip/karma-playwright-launcher": "^0.2.1",
     "babel-loader": "^8.2.5",
-    "babel-plugin-transform-es2015-modules-simple-commonjs": "~0.3.0",
-    "babel-plugin-transform-for-of-as-array": "^1.1.1",
     "confusing-browser-globals": "^1.0.11",
     "core-js": "file:./packages/core-js",
     "core-js-builder": "file:./packages/core-js-builder",