diff --git a/tasks/transform_conformance/snapshots/oxc.snap.md b/tasks/transform_conformance/snapshots/oxc.snap.md
index 7aefa594129d4..336705c8bf7ad 100644
--- a/tasks/transform_conformance/snapshots/oxc.snap.md
+++ b/tasks/transform_conformance/snapshots/oxc.snap.md
@@ -1,6 +1,6 @@
 commit: 91b4ce32
 
-Passed: 218/363
+Passed: 218/364
 
 # All Passed:
 * babel-plugin-transform-class-static-block
@@ -69,7 +69,7 @@ after transform: SymbolId(0): [ReferenceId(0), ReferenceId(2), ReferenceId(6), R
 rebuilt        : SymbolId(0): [ReferenceId(0), ReferenceId(2), ReferenceId(6), ReferenceId(10)]
 
 
-# babel-plugin-transform-typescript (15/47)
+# babel-plugin-transform-typescript (15/48)
 * allow-declare-fields-false/input.ts
 Unresolved references mismatch:
 after transform: ["dce"]
@@ -191,6 +191,20 @@ Symbol reference IDs mismatch for "NestInner":
 after transform: SymbolId(18): [ReferenceId(31), ReferenceId(32), ReferenceId(33), ReferenceId(34), ReferenceId(35)]
 rebuilt        : SymbolId(9): [ReferenceId(25), ReferenceId(26), ReferenceId(28), ReferenceId(29), ReferenceId(30), ReferenceId(31)]
 
+* enum-string-alias-member/input.ts
+Bindings mismatch:
+after transform: ScopeId(2): ["Color", "Green", "Primary", "Red"]
+rebuilt        : ScopeId(1): ["Color"]
+Scope flags mismatch:
+after transform: ScopeId(2): ScopeFlags(0x0)
+rebuilt        : ScopeId(1): ScopeFlags(Function)
+Symbol flags mismatch for "Color":
+after transform: SymbolId(4): SymbolFlags(RegularEnum)
+rebuilt        : SymbolId(0): SymbolFlags(FunctionScopedVariable)
+Symbol reference IDs mismatch for "Color":
+after transform: SymbolId(4): [ReferenceId(5), ReferenceId(6), ReferenceId(7), ReferenceId(12)]
+rebuilt        : SymbolId(0): [ReferenceId(6), ReferenceId(7), ReferenceId(8)]
+
 * enum-template-literal/input.ts
 Bindings mismatch:
 after transform: ScopeId(1): ["LARGE", "SMALL", "Size"]
diff --git a/tasks/transform_conformance/tests/babel-plugin-transform-typescript/test/fixtures/enum-string-alias-member/input.ts b/tasks/transform_conformance/tests/babel-plugin-transform-typescript/test/fixtures/enum-string-alias-member/input.ts
new file mode 100644
index 0000000000000..938111fb84eb8
--- /dev/null
+++ b/tasks/transform_conformance/tests/babel-plugin-transform-typescript/test/fixtures/enum-string-alias-member/input.ts
@@ -0,0 +1,16 @@
+// https://github.com/rolldown/rolldown/issues/8866
+const enum Theme {
+  Light = "Light",
+  Dark = "Dark",
+  Default = Theme.Light,
+}
+console.log(Theme.Light);
+console.log(Theme.Default);
+
+enum Color {
+  Red = "Red",
+  Green = "Green",
+  Primary = Color.Red,
+}
+Color.Red;
+Color.Primary;
diff --git a/tasks/transform_conformance/tests/babel-plugin-transform-typescript/test/fixtures/enum-string-alias-member/options.json b/tasks/transform_conformance/tests/babel-plugin-transform-typescript/test/fixtures/enum-string-alias-member/options.json
new file mode 100644
index 0000000000000..560b3dbfa3c85
--- /dev/null
+++ b/tasks/transform_conformance/tests/babel-plugin-transform-typescript/test/fixtures/enum-string-alias-member/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": [["transform-typescript", { "optimizeConstEnums": true }]]
+}
diff --git a/tasks/transform_conformance/tests/babel-plugin-transform-typescript/test/fixtures/enum-string-alias-member/output.js b/tasks/transform_conformance/tests/babel-plugin-transform-typescript/test/fixtures/enum-string-alias-member/output.js
new file mode 100644
index 0000000000000..f72b053097a27
--- /dev/null
+++ b/tasks/transform_conformance/tests/babel-plugin-transform-typescript/test/fixtures/enum-string-alias-member/output.js
@@ -0,0 +1,10 @@
+console.log("Light");
+console.log("Light");
+var Color = /* @__PURE__ */ function(Color) {
+	Color["Red"] = "Red";
+	Color["Green"] = "Green";
+	Color["Primary"] = "Red";
+	return Color;
+}(Color || {});
+Color.Red;
+Color.Primary;