diff --git a/packages/node-runtime/src/semantic-index/worker-runtime.test.ts b/packages/node-runtime/src/semantic-index/worker-runtime.test.ts
index 83f46e56..9bf25dc0 100644
--- a/packages/node-runtime/src/semantic-index/worker-runtime.test.ts
+++ b/packages/node-runtime/src/semantic-index/worker-runtime.test.ts
@@ -26,7 +26,7 @@ test('worker runtime lazily creates service and forwards RPC calls', async () =>
   const factory: SemanticIndexWorkerServiceFactory = () => {
     const service = new FakeSemanticIndexRuntime()
     services.push(service)
-    return service as SemanticIndexRuntime
+    return service as unknown as SemanticIndexRuntime
   }
   const runtime = createSemanticIndexWorkerRuntime({ serviceFactory: factory })
 
diff --git a/tsconfig.web.json b/tsconfig.web.json
index 51dc0bc0..ce10a103 100644
--- a/tsconfig.web.json
+++ b/tsconfig.web.json
@@ -19,6 +19,7 @@
     "noUnusedLocals": true,
     "strictNullChecks": true,
     "allowJs": true,
+    "allowImportingTsExtensions": true,
     "forceConsistentCasingInFileNames": true,
     "paths": {
       "@/*": ["src/*"],