Fix optional method chaining in derived classes

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

@@ -86,6 +86,10 @@ export default declare((api, options) => {
                 context = object;
               }
 
+              if (t.isSuper(context)) {
+                context = t.thisExpression();
+              }
+
               node.arguments.unshift(t.cloneNode(context));
               node.callee = t.memberExpression(
                 node.callee,

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);
+  }
+
+}