chore: fix lint errors

.github/copilot-instructions.md

@@ -99,9 +99,9 @@ jest.mocked(obj.method).mockReturnValue(x); // typed cast for already-mocked
 Never:
 
 ```ts
-jest.fn().mockReturnValue(x)        // widens to UnknownFunction
-(x as jest.Mock).mockReturnValue(y) // cast soup
-{foo: jest.fn()} as unknown as Real // construct typed instead
+jest.fn().mockReturnValue(x); // widens to UnknownFunction
+(x as jest.Mock).mockReturnValue(y); // cast soup
+({foo: jest.fn()}) as unknown as Real; // construct typed instead
 ```
 
 `beforeEach(() => jest.clearAllMocks())` fails `typecheck:tests` (return type widens). Use a block body: `beforeEach(() => { jest.clearAllMocks(); })`.

eslint.config.mjs

@@ -817,7 +817,14 @@ const config = defineConfig(
       'unicorn/prefer-number-properties': 'off',
     },
   },
-
+  // Instruction files for AI agents
+  {
+    files: ['**/CLAUDE.md/**', '.github/copilot-instructions.md/**'],
+    rules: {
+      '@typescript-eslint/explicit-module-boundary-types': 'off',
+      '@typescript-eslint/no-unused-expressions': 'off',
+    },
+  },
   {
     ignores: [
       '!.*',

packages/expect/src/__tests__/asymmetricMatchers.test.ts

@@ -6,7 +6,7 @@
  *
  */
 
-import {runInNewContext} from 'node:vm';
+import {runInNewContext} from 'vm';
 import jestExpect from '../';
 import {
   any,

packages/jest-reporters/CLAUDE.md

@@ -23,11 +23,13 @@ interface Reporter {
 ## Configuring reporters
 
 ```js
-reporters: [
-  'default',                                         // DefaultReporter
-  ['jest-junit', {outputDirectory: './reports'}],
-  ['<rootDir>/my-reporter.js', {}],
-],
+module.exports = {
+  reporters: [
+    'default', // DefaultReporter
+    ['jest-junit', {outputDirectory: './reports'}],
+    ['<rootDir>/my-reporter.js', {}],
+  ],
+};
 ```
 
 Constructor receives `(globalConfig, reporterOptions, reporterContext)`. `SummaryReporter` is always appended by jest-core. Without `'default'` in the list, `DefaultReporter` is not added.