fix: generate config/ tsconfig files in the update path alongside warp.config.yml

The update path (existing package with package.json) was generating
warp.config.yml with ./config/tsconfig.src.*.json references but not
generating the config/ directory or tsconfig.json with the matching
references. This caused warp build failures for all TypeSpec-based
SDK validation runs.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: maorleger

packages/rlc-common/test/integration/warpConfig.spec.ts

@@ -4,6 +4,12 @@
 import { describe, it, expect } from "vitest";
 
 import { buildWarpConfig } from "../../src/metadata/buildWarpConfig.js";
+import {
+  buildTsSrcEsmConfig,
+  buildTsSrcBrowserConfig,
+  buildTsSrcReactNativeConfig,
+  buildTsSrcCjsConfig
+} from "../../src/metadata/buildTsConfig.js";
 import { createMockModel } from "./mockHelper.js";
 
 describe("warp.config.yml generation", () => {
@@ -94,4 +100,28 @@ describe("warp.config.yml generation", () => {
       expect(result!.content).toContain("name: commonjs");
     });
   });
+
+  describe("tsconfig path consistency", () => {
+    it("warp config references every config/ tsconfig that the builders produce", () => {
+      const model = createMockModel({
+        moduleKind: "esm",
+        isMonorepo: true,
+        flavor: "azure"
+      });
+
+      const warpContent = buildWarpConfig(model)!.content;
+
+      const configBuilders = [
+        buildTsSrcEsmConfig,
+        buildTsSrcBrowserConfig,
+        buildTsSrcReactNativeConfig,
+        buildTsSrcCjsConfig
+      ];
+
+      for (const builder of configBuilders) {
+        const tsconfigPath = `./${builder().path}`;
+        expect(warpContent).toContain(tsconfigPath);
+      }
+    });
+  });
 });

packages/typespec-ts/src/index.ts

@@ -638,11 +638,16 @@ export async function $onEmit(context: EmitContext) {
         );
       }
 
-      // Update warp.config.yml for Azure monorepo packages
+      // Update warp.config.yml and config/ tsconfig files for Azure monorepo packages
       if (option.azureSdkForJs) {
         updateBuilders.push((model: RLCModel) =>
           buildWarpConfig(model, modularPackageInfo)
         );
+        updateBuilders.push(buildTsConfig);
+        updateBuilders.push(buildTsSrcEsmConfig);
+        updateBuilders.push(buildTsSrcBrowserConfig);
+        updateBuilders.push(buildTsSrcReactNativeConfig);
+        updateBuilders.push(buildTsSrcCjsConfig);
       }
 
       // If the client name changed, regenerate the README and snippets completely;