Fix export of enum with same-named member (#55070)

Author: rbuckton

src/compiler/checker.ts

@@ -3040,8 +3040,8 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
                 // (it refers to the constant type of the expression instead)
                 return undefined;
             }
-            if (isModuleDeclaration(location) && lastLocation && location.name === lastLocation) {
-                // If this is the name of a namespace, skip the parent since it will have is own locals that could
+            if (isModuleOrEnumDeclaration(location) && lastLocation && location.name === lastLocation) {
+                // If lastLocation is the name of a namespace or enum, skip the parent since it will have is own locals that could
                 // conflict.
                 lastLocation = location;
                 location = location.parent;

tests/baselines/reference/exportDeclarationForModuleOrEnumWithMemberOfSameName(module=commonjs).js

@@ -0,0 +1,31 @@
+//// [tests/cases/compiler/exportDeclarationForModuleOrEnumWithMemberOfSameName.ts] ////
+
+//// [exportDeclarationForModuleOrEnumWithMemberOfSameName.ts]
+// https://github.com/microsoft/TypeScript/issues/55038
+
+namespace A {
+    export const A = 0;
+}
+
+export { A }
+
+enum B {
+    B
+}
+
+export { B }
+
+
+//// [exportDeclarationForModuleOrEnumWithMemberOfSameName.js]
+"use strict";
+// https://github.com/microsoft/TypeScript/issues/55038
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.B = exports.A = void 0;
+var A;
+(function (A_1) {
+    A_1.A = 0;
+})(A || (exports.A = A = {}));
+var B;
+(function (B) {
+    B[B["B"] = 0] = "B";
+})(B || (exports.B = B = {}));

tests/baselines/reference/exportDeclarationForModuleOrEnumWithMemberOfSameName(module=system).js

@@ -0,0 +1,36 @@
+//// [tests/cases/compiler/exportDeclarationForModuleOrEnumWithMemberOfSameName.ts] ////
+
+//// [exportDeclarationForModuleOrEnumWithMemberOfSameName.ts]
+// https://github.com/microsoft/TypeScript/issues/55038
+
+namespace A {
+    export const A = 0;
+}
+
+export { A }
+
+enum B {
+    B
+}
+
+export { B }
+
+
+//// [exportDeclarationForModuleOrEnumWithMemberOfSameName.js]
+// https://github.com/microsoft/TypeScript/issues/55038
+System.register([], function (exports_1, context_1) {
+    "use strict";
+    var A, B;
+    var __moduleName = context_1 && context_1.id;
+    return {
+        setters: [],
+        execute: function () {// https://github.com/microsoft/TypeScript/issues/55038
+            (function (A_1) {
+                A_1.A = 0;
+            })(A || (exports_1("A", A = {})));
+            (function (B) {
+                B[B["B"] = 0] = "B";
+            })(B || (exports_1("B", B = {})));
+        }
+    };
+});

tests/cases/compiler/exportDeclarationForModuleOrEnumWithMemberOfSameName.ts

@@ -0,0 +1,16 @@
+// @target: esnext
+// @module: commonjs,system
+// @noTypesAndSymbols: true
+// https://github.com/microsoft/TypeScript/issues/55038
+
+namespace A {
+    export const A = 0;
+}
+
+export { A }
+
+enum B {
+    B
+}
+
+export { B }