chore(lint): enforce zero warnings and cleanup syntax restrictions (#22902)

eslint.config.js

@@ -35,6 +35,12 @@ const commonRestrictedSyntaxRules = [
     message:
       'Do not throw string literals or non-Error objects. Throw new Error("...") instead.',
   },
+  {
+    selector:
+      'UnaryExpression[operator="typeof"] > MemberExpression[computed=true][property.type="Literal"]',
+    message:
+      'Do not use typeof to check object properties. Define a TypeScript interface and a type guard function instead.',
+  },
 ];
 
 export default tseslint.config(
@@ -133,16 +139,7 @@ export default tseslint.config(
       'no-cond-assign': 'error',
       'no-debugger': 'error',
       'no-duplicate-case': 'error',
-      'no-restricted-syntax': [
+      'no-restricted-syntax': ['error', ...commonRestrictedSyntaxRules],
-        'error',
-        ...commonRestrictedSyntaxRules,
-        {
-          selector:
-            'UnaryExpression[operator="typeof"] > MemberExpression[computed=true][property.type="Literal"]',
-          message:
-            'Do not use typeof to check object properties. Define a TypeScript interface and a type guard function instead.',
-        },
-      ],
       'no-unsafe-finally': 'error',
       'no-unused-expressions': 'off', // Disable base rule
       '@typescript-eslint/no-unused-expressions': [

package.json

@@ -51,7 +51,7 @@
     "test:integration:sandbox:none": "cross-env GEMINI_SANDBOX=false vitest run --root ./integration-tests",
     "test:integration:sandbox:docker": "cross-env GEMINI_SANDBOX=docker npm run build:sandbox && cross-env GEMINI_SANDBOX=docker vitest run --root ./integration-tests",
     "test:integration:sandbox:podman": "cross-env GEMINI_SANDBOX=podman vitest run --root ./integration-tests",
-    "lint": "eslint . --cache",
+    "lint": "eslint . --cache --max-warnings 0",
     "lint:fix": "eslint . --fix --ext .ts,.tsx && eslint integration-tests --fix && eslint scripts --fix && npm run format",
     "lint:ci": "npm run lint:all",
     "lint:all": "node scripts/lint.js",

packages/cli/src/nonInteractiveCli.test.ts

@@ -1137,6 +1137,7 @@ describe('runNonInteractive', () => {
 
     expect(
       processStderrSpy.mock.calls.some(
+        // eslint-disable-next-line no-restricted-syntax
         (call) => typeof call[0] === 'string' && call[0].includes('Cancelling'),
       ),
     ).toBe(true);

packages/cli/src/test-utils/customMatchers.ts

@@ -79,7 +79,7 @@ export async function toMatchSvgSnapshot(
 }
 
 function toHaveOnlyValidCharacters(this: Assertion, buffer: TextBuffer) {
-  // eslint-disable-next-line @typescript-eslint/no-explicit-any, @typescript-eslint/no-unsafe-type-assertion, @typescript-eslint/no-unsafe-assignment
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
   const { isNot } = this as any;
   let pass = true;
   const invalidLines: Array<{ line: number; content: string }> = [];
@@ -108,7 +108,6 @@ function toHaveOnlyValidCharacters(this: Assertion, buffer: TextBuffer) {
   };
 }
 
-// eslint-disable-next-line @typescript-eslint/no-unsafe-type-assertion
 expect.extend({
   toHaveOnlyValidCharacters,
   toMatchSvgSnapshot,

packages/cli/src/test-utils/mockCommandContext.ts

@@ -37,14 +37,12 @@ export const createMockCommandContext = (
     },
     services: {
       agentContext: null,
-
       settings: {
         merged: defaultMergedSettings,
         setValue: vi.fn(),
         forScope: vi.fn().mockReturnValue({ settings: {} }),
       } as unknown as LoadedSettings,
       git: undefined as GitService | undefined,
-
       logger: {
         log: vi.fn(),
         logMessage: vi.fn(),
@@ -53,7 +51,6 @@ export const createMockCommandContext = (
         // eslint-disable-next-line @typescript-eslint/no-explicit-any
       } as any, // Cast because Logger is a class.
     },
-
     ui: {
       addItem: vi.fn(),
       clear: vi.fn(),
@@ -72,7 +69,6 @@ export const createMockCommandContext = (
     } as any,
     session: {
       sessionShellAllowlist: new Set<string>(),
-
       stats: {
         sessionStartTime: new Date(),
         lastPromptTokenCount: 0,
@@ -98,7 +94,6 @@ export const createMockCommandContext = (
     for (const key in source) {
       if (Object.prototype.hasOwnProperty.call(source, key)) {
         const sourceValue = source[key];
-
         const targetValue = output[key];
 
         if (
@@ -109,7 +104,6 @@ export const createMockCommandContext = (
           output[key] = merge(targetValue, sourceValue);
         } else {
           // If not, we do a direct assignment. This preserves Date objects and others.
-
           output[key] = sourceValue;
         }
       }

packages/cli/src/test-utils/render.tsx

@@ -778,7 +778,6 @@ export async function renderHook<Result, Props>(
   generateSvg: () => string;
 }> {
   const result = { current: undefined as unknown as Result };
-
   let currentProps = options?.initialProps as Props;
 
   function TestComponent({

packages/cli/src/test-utils/settings.ts

@@ -46,7 +46,6 @@ export const createMockSettings = (
     workspace,
     isTrusted,
     errors,
-
     merged: mergedOverride,
     ...settingsOverrides
   } = overrides;
@@ -61,7 +60,6 @@ export const createMockSettings = (
       settings: settingsOverrides,
       originalSettings: settingsOverrides,
     },
-
     (workspace as any) || { path: '', settings: {}, originalSettings: {} },
     isTrusted ?? true,
     errors || [],

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

@@ -42,6 +42,7 @@ describe('IdeIntegrationNudge', () => {
   beforeEach(() => {
     vi.mocked(debugLogger.warn).mockImplementation((...args) => {
       if (
+        // eslint-disable-next-line no-restricted-syntax
         typeof args[0] === 'string' &&
         /was not wrapped in act/.test(args[0])
       ) {

packages/cli/src/ui/auth/AuthInProgress.test.tsx

@@ -42,6 +42,7 @@ describe('AuthInProgress', () => {
     vi.useFakeTimers();
     vi.mocked(debugLogger.error).mockImplementation((...args) => {
       if (
+        // eslint-disable-next-line no-restricted-syntax
         typeof args[0] === 'string' &&
         args[0].includes('was not wrapped in act')
       ) {

packages/cli/src/ui/hooks/slashCommandProcessor.ts

@@ -505,7 +505,9 @@ export const useSlashCommandProcessor = (
                       const props = result.props as Record<string, unknown>;
                       if (
                         !props ||
+                        // eslint-disable-next-line no-restricted-syntax
                         typeof props['name'] !== 'string' ||
+                        // eslint-disable-next-line no-restricted-syntax
                         typeof props['displayName'] !== 'string' ||
                         !props['definition']
                       ) {

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

@@ -514,6 +514,7 @@ describe('textUtils', () => {
           const b = sanitized.b as { c: string; d: Array<string | object> };
           expect(b.c).toBe('\\u001b[32mgreen\\u001b[0m');
           expect(b.d[0]).toBe('\\u001b[33myellow\\u001b[0m');
+          // eslint-disable-next-line no-restricted-syntax
           if (typeof b.d[1] === 'object' && b.d[1] !== null) {
             const e = b.d[1] as { e: string };
             expect(e.e).toBe('\\u001b[34mblue\\u001b[0m');

packages/cli/src/utils/cleanup.test.ts

@@ -183,6 +183,7 @@ describe('signal and TTY handling', () => {
 
       const sigtermHandlers = processOnHandlers.get('SIGTERM') || [];
       expect(sigtermHandlers.length).toBeGreaterThan(0);
+      // eslint-disable-next-line no-restricted-syntax
       expect(typeof sigtermHandlers[0]).toBe('function');
     });
   });

packages/cli/src/utils/sessions.test.ts

@@ -214,6 +214,7 @@ describe('listSessions', () => {
     // Get all the session log calls (skip the header)
     const sessionCalls = mocks.writeToStdout.mock.calls.filter(
       (call): call is [string] =>
+        // eslint-disable-next-line no-restricted-syntax
         typeof call[0] === 'string' &&
         call[0].includes('[session-') &&
         !call[0].includes('Available sessions'),

packages/core/src/services/FolderTrustDiscoveryService.ts

@@ -163,6 +163,7 @@ export class FolderTrustDiscoveryService {
         for (const event of Object.values(hooksConfig)) {
           if (!Array.isArray(event)) continue;
           for (const hook of event) {
+            // eslint-disable-next-line no-restricted-syntax
             if (this.isRecord(hook) && typeof hook['command'] === 'string') {
               hooks.add(hook['command']);
             }

packages/core/src/telemetry/sanitize.test.ts

@@ -136,7 +136,9 @@ describe('Telemetry Sanitization', () => {
         const attributes = event.toOpenTelemetryAttributes(config);
 
         // Should be JSON stringified
+        // eslint-disable-next-line no-restricted-syntax
         expect(typeof attributes['hook_input']).toBe('string');
+        // eslint-disable-next-line no-restricted-syntax
         expect(typeof attributes['hook_output']).toBe('string');
 
         const parsedInput = JSON.parse(attributes['hook_input'] as string);

packages/core/src/test-utils/mock-message-bus.ts

@@ -62,7 +62,6 @@ export class MockMessageBus {
       if (!this.subscriptions.has(type)) {
         this.subscriptions.set(type, new Set());
       }
-      // eslint-disable-next-line @typescript-eslint/no-unsafe-type-assertion
       this.subscriptions.get(type)!.add(listener as (message: Message) => void);
     },
   );
@@ -74,7 +73,6 @@ export class MockMessageBus {
     <T extends Message>(type: T['type'], listener: (message: T) => void) => {
       const listeners = this.subscriptions.get(type);
       if (listeners) {
-        // eslint-disable-next-line @typescript-eslint/no-unsafe-type-assertion
         listeners.delete(listener as (message: Message) => void);
       }
     },
@@ -103,7 +101,6 @@ export class MockMessageBus {
  * Create a mock MessageBus for testing
  */
 export function createMockMessageBus(): MessageBus {
-  // eslint-disable-next-line @typescript-eslint/no-unsafe-type-assertion
   return new MockMessageBus() as unknown as MessageBus;
 }
 
@@ -113,6 +110,5 @@ export function createMockMessageBus(): MessageBus {
 export function getMockMessageBusInstance(
   messageBus: MessageBus,
 ): MockMessageBus {
-  // eslint-disable-next-line @typescript-eslint/no-unsafe-type-assertion
   return messageBus as unknown as MockMessageBus;
 }

packages/core/src/test-utils/mockWorkspaceContext.ts

@@ -19,7 +19,6 @@ export function createMockWorkspaceContext(
 ): WorkspaceContext {
   const allDirs = [rootDir, ...additionalDirs];
 
-  // eslint-disable-next-line @typescript-eslint/no-unsafe-type-assertion
   const mockWorkspaceContext = {
     addDirectory: vi.fn(),
     getDirectories: vi.fn().mockReturnValue(allDirs),

packages/core/src/tools/read-file.test.ts

@@ -674,6 +674,7 @@ describe('ReadFileTool', () => {
       const parts = result.llmContent as Array<Record<string, unknown>>;
       const jitTextPart = parts.find(
         (p) =>
+          // eslint-disable-next-line no-restricted-syntax
           typeof p['text'] === 'string' && p['text'].includes('Auth rules'),
       );
       expect(jitTextPart).toBeDefined();