refactor(cli): stop utils/ importing serve/ and the UI layer (#9146) (#9147)

packages/cli/src/utils is the directory every other directory imports
(83 from ui, 30 from the package root, 23 from config), so it only
works as a leaf. It currently imports back into six siblings, which is
what makes the package's directory graph cyclic.

Three moves, each decided by who actually consumes the module:

- serve/fast-path-argv.ts moves down into utils/. It is 25 lines with
  no imports, doing pure argv string manipulation, consumed from three
  layers. A utility filed under the daemon; relocate the target rather
  than rework the caller. Renamed serve-fast-path-argv.ts since
  fast-path-argv is ambiguous among general helpers.
- utils/windowTitle.ts moves up into ui/utils/. Its only consumers are
  AppContainer and startInteractiveUI, and it imports StreamingState,
  ICON and the OSC-8 helper.
- utils/systemInfo.ts imports formatMemoryUsage from core directly
  instead of through ui/utils/formatters.ts, a one-line re-export of
  the same symbol. It cannot move into ui/ because the daemon status
  provider consumes it, so the import is inverted instead.

Adds a no-restricted-imports rule for utils/** rejecting serve/. Scoped
to serve/ only: that direction is now completely clean, so the rule
states something true. The remaining ui/, config/, i18n/ and
nonInteractive/ edges are tracked in #9146.

Runtime upward imports out of cli/src/utils: 25 -> 20; utils -> serve
1 -> 0, eliminating that cycle; utils -> ui 7 -> 3.

eslint.config.js

@@ -72,6 +72,27 @@ export default tseslint.config(
       'import/namespace': 'off', // Disabled due to https://github.com/import-js/eslint-plugin-import/issues/2866
     },
   },
+  {
+    // `utils/` is the layer every other directory imports, so it must not
+    // import back into one. The daemon direction is clean and enforced here;
+    // the remaining `ui/`, `config/`, `i18n/` and `nonInteractive/` edges are
+    // tracked in #9146 and will be added to this group as they are resolved.
+    files: ['packages/cli/src/utils/**/*.{ts,tsx}'],
+    rules: {
+      'no-restricted-imports': [
+        'error',
+        {
+          patterns: [
+            {
+              group: ['**/serve/*', '**/serve/**'],
+              message:
+                'packages/cli/src/utils must not import serve/. Move lifecycle-free logic down into utils/ instead (#9146).',
+            },
+          ],
+        },
+      ],
+    },
+  },
   {
     // General overrides and rules for the project (TS/TSX files)
     files: [

packages/cli/src/cli.ts

@@ -14,7 +14,7 @@ import {
 } from 'node:fs';
 import { fileURLToPath, pathToFileURL } from 'node:url';
 import type { ArgumentsCamelCase, Argv, Options } from 'yargs';
-import { normalizeServeFastPathArgv } from './serve/fast-path-argv.js';
+import { normalizeServeFastPathArgv } from './utils/serve-fast-path-argv.js';
 import { initStartupProfiler } from './utils/startupProfiler.js';
 import { initCpuProfiler } from './utils/cpuProfiler.js';
 import {

packages/cli/src/serve/fast-path.ts

@@ -10,7 +10,7 @@ import {
   isValidMemoryBudgetMb,
   memoryBudgetRangeError,
 } from '@qwen-code/acp-bridge/daemonMemoryBudget';
-import { normalizeServeFastPathArgv } from './fast-path-argv.js';
+import { normalizeServeFastPathArgv } from '../utils/serve-fast-path-argv.js';
 import type { ServeFastPathSettings } from './fast-path-settings.js';
 import { RUNTIME_STARTUP_CANCELLED_MESSAGE } from './runtime-startup-errors.js';
 import type { ServeOptions } from './types.js';

packages/cli/src/ui/AppContainer.test.tsx

@@ -21,9 +21,9 @@ vi.mock('./utils/terminal-resize-reflow.js', () => ({
   buildWakeRepaint: buildWakeRepaintSpy,
 }));
 
-vi.mock('../utils/windowTitle.js', async (importOriginal) => {
+vi.mock('./utils/windowTitle.js', async (importOriginal) => {
   const actual =
-    await importOriginal<typeof import('../utils/windowTitle.js')>();
+    await importOriginal<typeof import('./utils/windowTitle.js')>();
   return {
     ...actual,
     writeTerminalTitle: (
@@ -62,7 +62,7 @@ import {
 import {
   formatSessionWindowTitle,
   writeTerminalTitle,
-} from '../utils/windowTitle.js';
+} from './utils/windowTitle.js';
 import ansiEscapes from 'ansi-escapes';
 import {
   type Config,

packages/cli/src/ui/AppContainer.tsx

@@ -158,7 +158,7 @@ import {
   formatSessionWindowTitle,
   titleStatusPrefix,
   writeTerminalTitle,
-} from '../utils/windowTitle.js';
+} from './utils/windowTitle.js';
 import { clearScreen } from '../utils/stdioHelpers.js';
 import { useTextBuffer } from './components/shared/text-buffer.js';
 import { useLogger } from './hooks/useLogger.js';

packages/cli/src/ui/startInteractiveUI.tsx

@@ -55,7 +55,7 @@ import { startPostRenderPrefetches } from '../startup/startup-prefetch.js';
 import {
   computeWindowTitle,
   writeTerminalTitle,
-} from '../utils/windowTitle.js';
+} from './utils/windowTitle.js';
 import { getCliVersion } from '../utils/version.js';
 
 const debugLogger = createDebugLogger('STARTUP');

packages/cli/src/ui/utils/windowTitle.test.ts

@@ -5,7 +5,7 @@
  */
 
 import { describe, it, expect, vi, beforeEach } from 'vitest';
-import { StreamingState } from '../ui/types.js';
+import { StreamingState } from '../types.js';
 import {
   computeWindowTitle,
   writeTerminalTitle,

packages/cli/src/ui/utils/windowTitle.ts

@@ -4,9 +4,9 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-import { sanitizeForOsc } from '../ui/utils/osc8.js';
-import { ICON } from '../ui/constants.js';
-import { StreamingState } from '../ui/types.js';
+import { sanitizeForOsc } from './osc8.js';
+import { ICON } from '../constants.js';
+import { StreamingState } from '../types.js';
 
 export const DEFAULT_WINDOW_TITLE = 'qwen';
 

packages/cli/src/utils/startupProfiler.ts

@@ -31,7 +31,7 @@ import * as path from 'node:path';
 import { performance } from 'node:perf_hooks';
 
 import type { StartupEventAttrs } from '@qwen-code/qwen-code-core';
-import { isServeFastPathArgv } from '../serve/fast-path-argv.js';
+import { isServeFastPathArgv } from './serve-fast-path-argv.js';
 
 interface Checkpoint {
   name: string;

packages/cli/src/utils/systemInfo.ts

@@ -13,9 +13,9 @@ import {
   IdeClient,
   AuthType,
   createDebugLogger,
+  formatMemoryUsage,
   type LspStatusSnapshot,
 } from '@qwen-code/qwen-code-core';
-import { formatMemoryUsage } from '../ui/utils/formatters.js';
 import { GIT_COMMIT_INFO } from '../generated/git-commit.js';
 
 const debugLogger = createDebugLogger('STATUS');