Fix optional method chaining in derived classes (#10694)

packages/babel-plugin-proposal-optional-chaining/src/index.js

@@ -82,6 +82,8 @@ export default declare((api, options) => {
               let context = scope.maybeGenerateMemoised(object);
               if (context) {
                 chain.object = t.assignmentExpression("=", context, object);
+              } else if (t.isSuper(object)) {
+                context = t.thisExpression();
               } else {
                 context = object;
               }

packages/babel-plugin-proposal-optional-chaining/test/fixtures/general/super-method-call-loose/input.js

@@ -0,0 +1,12 @@
+"use strict";
+class Base {
+  method() {
+    return 'Hello!';
+  }
+}
+
+class Derived extends Base {
+    method() {
+        return super.method?.()
+    }
+}

packages/babel-plugin-proposal-optional-chaining/test/fixtures/general/super-method-call-loose/options.json

@@ -0,0 +1,3 @@
+{
+  "plugins": [["proposal-optional-chaining", { "loose": true }]]
+}

packages/babel-plugin-proposal-optional-chaining/test/fixtures/general/super-method-call-loose/output.js

@@ -0,0 +1,15 @@
+"use strict";
+
+class Base {
+  method() {
+    return 'Hello!';
+  }
+
+}
+
+class Derived extends Base {
+  method() {
+    return super.method == null ? void 0 : super.method();
+  }
+
+}

packages/babel-plugin-proposal-optional-chaining/test/fixtures/general/super-method-call/input.js

@@ -0,0 +1,12 @@
+"use strict";
+class Base {
+  method() {
+    return 'Hello!';
+  }
+}
+
+class Derived extends Base {
+    method() {
+        return super.method?.()
+    }
+}

packages/babel-plugin-proposal-optional-chaining/test/fixtures/general/super-method-call/output.js

@@ -0,0 +1,17 @@
+"use strict";
+
+class Base {
+  method() {
+    return 'Hello!';
+  }
+
+}
+
+class Derived extends Base {
+  method() {
+    var _super$method;
+
+    return (_super$method = super.method) === null || _super$method === void 0 ? void 0 : _super$method.call(this);
+  }
+
+}