Autorest: Propagate @clientName to x-ms-enum.name for enums and unions (

#2137)

Fixes #1641.

.chronus/changes/clientNameXMsEnum-2025-0-27-14-20-31.md

@@ -0,0 +1,7 @@
+---
+changeKind: fix
+packages:
+  - "@azure-tools/typespec-autorest"
+---
+
+Ensure that `@clientName` value propagates to `x-ms-enum.name` for enums and unions.

packages/typespec-autorest/src/openapi.ts

@@ -1770,11 +1770,13 @@ export async function getOpenAPIForService(
         foundCustom = true;
       }
     }
+
+    const clientName = getClientName(context, union as any);
     const schema: OpenAPI2Schema = {
       type: e.kind,
       enum: [...e.flattenedMembers.values()].map((x) => x.value),
       "x-ms-enum": {
-        name: union.name,
+        name: clientName ?? union.name,
         modelAsString: e.open,
       },
     };
@@ -2310,8 +2312,9 @@ export async function getOpenAPIForService(
         modelAsString: false,
       };
     } else if (type.kind === "Enum") {
+      const clientName = getClientName(context, type);
       schema["x-ms-enum"] = {
-        name: type.name,
+        name: clientName ?? type.name,
         modelAsString: false,
       };
 

packages/typespec-autorest/test/openapi-output.test.ts

@@ -436,6 +436,24 @@ describe("typespec-autorest: definitions", () => {
         required: ["name"],
       });
     });
+
+    it("overrides x-ms-enum.name with @clientName", async () => {
+      const res = await oapiForModel(
+        "FooResponse",
+        `
+        @clientName("RenamedFoo")
+        union Foo {
+          foo: "foo",
+          bar: "bar"
+        }
+
+        model FooResponse {
+          foo: Foo;
+        }`,
+      );
+      const schema = res.defs.RenamedFoo;
+      deepStrictEqual(schema["x-ms-enum"].name, "RenamedFoo");
+    });
   });
 
   it("recovers logical type name", async () => {
@@ -754,6 +772,12 @@ describe("typespec-autorest: enums", () => {
       "x-ms-enum": { name: "PetType", modelAsString: true },
     });
   });
+
+  it("overrides x-ms-enum.name with @clientName", async () => {
+    const res = await oapiForModel("Foo", `@clientName("RenamedFoo") enum Foo {foo, bar}`);
+    const schema = res.defs.RenamedFoo;
+    deepStrictEqual(schema["x-ms-enum"].name, "RenamedFoo");
+  });
 });
 
 describe("typespec-autorest: extension decorator", () => {