added check to disallow super.private variable access and test case added (#10472)

* 🚀 added check to disallow super.private variable access and test case added

* ♻️ change the other linting change back to how it was

* ♻️ change the other linting change back to how it was

* ♻️ added newline at the end test output.json file

* ♻️ changed the linting style to the way it was

* ♻️ updated error message, removed super private member access test cases from whitelist of flow and test 262 suite

* ♻️ added newline in output.json

packages/babel-parser/src/parser/expression.js

@@ -655,6 +655,12 @@ export default class ExpressionParser extends LValParser {
       node.object = base;
       node.property = this.parseMaybePrivateName();
       node.computed = false;
+      if (
+        node.property.type === "PrivateName" &&
+        node.object.type === "Super"
+      ) {
+        this.raise(startPos, "Private fields can't be accessed on super");
+      }
       if (state.optionalChainMember) {
         node.optional = false;
         return this.finishNode(node, "OptionalMemberExpression");

packages/babel-parser/test/fixtures/experimental/class-private-properties/super-private-member-access/input.js

@@ -0,0 +1,7 @@
+class A extends B {
+  #x;
+
+  method() {
+    super.#x;
+  }
+}

packages/babel-parser/test/fixtures/experimental/class-private-properties/super-private-member-access/options.json

@@ -0,0 +1,6 @@
+{
+  "plugins": [
+    "classPrivateProperties"
+  ],
+  "throws": "Private fields can't be accessed on super (5:4)"
+}