diff --git a/packages/rstack/tests/config/normalize.test.ts b/packages/rstack/tests/config/normalize.test.ts
index 50ab40c6..4251a879 100644
--- a/packages/rstack/tests/config/normalize.test.ts
+++ b/packages/rstack/tests/config/normalize.test.ts
@@ -1,46 +1,33 @@
 import { expect, rs, test } from 'rstack/test';
-import { normalizeRstackConfig, type RstackConfig } from '../../src/config.ts';
+import { normalizeRstackConfig } from '../../src/config.ts';
 import { resolveConfigLayers } from '../../src/configLayers.ts';
 
 test('preserves tool definitions without resolving factories or inheritance', () => {
   const app = rs.fn(() => ({}));
-  const staged = rs.fn(() => ['rs lint']);
-  const shared: RstackConfig = {
-    extends: [{ fmt: { singleQuote: true } }],
+  const config = normalizeRstackConfig({
+    extends: [
+      {
+        fmt: { singleQuote: true },
+      },
+    ],
     app,
-    staged,
-  };
+    lint: [],
+  });
 
-  expect(normalizeRstackConfig(shared)).toEqual({ app, staged });
-  expect(shared.extends).toEqual([{ fmt: { singleQuote: true } }]);
+  expect(config).toEqual({ app, lint: [] });
   expect(app).not.toHaveBeenCalled();
-  expect(staged).not.toHaveBeenCalled();
 });
 
-test('resolves sync and async lint factories lazily with tool exports', async () => {
-  const syncLint = rs.fn((lint: typeof import('@rslint/core')) => [
-    lint.js.configs.recommended,
-  ]);
-  const asyncLint = rs.fn((lint: typeof import('@rslint/core')) =>
-    Promise.resolve([lint.ts.configs.recommended]),
+test('wraps lint factories lazily with tool exports', async () => {
+  const lint = rs.fn((lint: typeof import('@rslint/core')) =>
+    Promise.resolve([lint.js.configs.recommended]),
   );
-  const shared: RstackConfig[] = [
-    { lint: [] },
-    { lint: syncLint },
-    { lint: asyncLint },
-  ];
-  const configs = shared.map(normalizeRstackConfig);
-
-  expect(syncLint).not.toHaveBeenCalled();
-  expect(asyncLint).not.toHaveBeenCalled();
-  expect(shared[1].lint).toBe(syncLint);
+  const config = normalizeRstackConfig({ lint });
 
-  const resolved = await resolveConfigLayers(configs, 'lint');
-  const { js, ts } = await import('@rslint/core');
+  expect(lint).not.toHaveBeenCalled();
 
-  expect(resolved).toEqual([
-    [],
+  const { js } = await import('@rslint/core');
+  expect(await resolveConfigLayers([config], 'lint')).toEqual([
     [js.configs.recommended],
-    [ts.configs.recommended],
   ]);
 });
diff --git a/packages/rstack/tests/types/shared-config/index.ts b/packages/rstack/tests/types/shared-config/index.ts
index 894e12a9..faf0cb4b 100644
--- a/packages/rstack/tests/types/shared-config/index.ts
+++ b/packages/rstack/tests/types/shared-config/index.ts
@@ -16,45 +16,20 @@ export const baseConfig: RstackConfig = {
   staged: { '*.ts': 'rs lint' },
 };
 
-export const syncConfig: RstackConfig = {
-  extends: [baseConfig] as const,
-  app: ({ command }) => ({
-    source: {
-      define: { COMMAND: JSON.stringify(command) },
-    },
-  }),
-  lib: ({ env }) => ({
-    lib: [{ format: 'esm' }],
-    mode: env === 'production' ? 'production' : 'development',
-  }),
-  test: () => ({ retry: 1 }),
-  lint: ({ js, ts }) => [js.configs.recommended, ts.configs.recommended],
-  fmt: () => ({ singleQuote: true }),
-  staged: (files) => (files.length ? ['rs lint'] : []),
-};
-
-export const asyncConfig: RstackConfig = {
-  app: ({ env }) =>
-    Promise.resolve({
-      source: {
-        define: { ENV: JSON.stringify(env) },
-      },
-    }),
-  lib: () =>
-    Promise.resolve({
-      lib: [{ format: 'esm' }],
-    }),
-  doc: () => Promise.resolve({ title: 'Docs' }),
-  test: () => Promise.resolve({ retry: 2 }),
-  lint: ({ js }) => Promise.resolve([js.configs.recommended]),
-  fmt: () => Promise.resolve({ singleQuote: true }),
-  staged: (files) => Promise.resolve(files.length ? ['rs fmt'] : []),
-};
-
 export function sharedConfig(options: { retry?: number } = {}): RstackConfig {
   return {
-    extends: [syncConfig, asyncConfig],
+    extends: [
+      baseConfig,
+      { lint: ({ js }) => Promise.resolve([js.configs.recommended]) },
+    ] as const,
     test: { retry: options.retry ?? 2 },
+    app: ({ command }) => ({
+      source: {
+        define: { COMMAND: JSON.stringify(command) },
+      },
+    }),
+    lint: ({ js, ts }) => [js.configs.recommended, ts.configs.recommended],
+    staged: (files) => (files.length ? ['rs lint'] : []),
   };
 }