Don't split an exported class when renaming an inner binding (#8051)

packages/babel-plugin-proposal-class-properties/test/fixtures/regression/7951/input.mjs

@@ -0,0 +1,5 @@
+export class Foo extends Bar {
+  static foo = {};
+
+  test = args;
+}

packages/babel-plugin-proposal-class-properties/test/fixtures/regression/7951/options.json

@@ -0,0 +1,3 @@
+{
+  "plugins": ["external-helpers", "proposal-class-properties"]
+}

packages/babel-plugin-proposal-class-properties/test/fixtures/regression/7951/output.mjs

@@ -0,0 +1,9 @@
+export class Foo extends Bar {
+  constructor(..._args) {
+    var _temp;
+
+    return _temp = super(..._args), babelHelpers.defineProperty(this, "test", args), _temp;
+  }
+
+}
+babelHelpers.defineProperty(Foo, "foo", {});

packages/babel-traverse/src/scope/lib/renamer.js

@@ -108,7 +108,12 @@ export default class Renamer {
         path.isClassExpression(),
     );
     if (parentDeclar) {
-      this.maybeConvertFromExportDeclaration(parentDeclar);
+      const bindingIds = parentDeclar.getBindingIdentifiers();
+      if (bindingIds[oldName] === binding.identifier) {
+        // When we are renaming an exported identifier, we need to ensure that
+        // the exported binding keeps the old name.
+        this.maybeConvertFromExportDeclaration(parentDeclar);
+      }
     }
 
     scope.traverse(block || scope.block, renameVisitor, this);