fix: update ESLint configuration file extension and add Jest globals as a dev dependency

.eslintrc.cjs

@@ -0,0 +1,51 @@
+// This is a reusable configuration file copied from https://github.com/actions/reusable-workflows/tree/main/reusable-configurations. Please don't make changes to this file as it's the subject of an automatic update.
+module.exports = {
+  extends: [
+    'eslint:recommended',
+    'plugin:@typescript-eslint/recommended',
+    'plugin:eslint-plugin-jest/recommended',
+    'eslint-config-prettier'
+  ],
+  parser: '@typescript-eslint/parser',
+  plugins: ['@typescript-eslint', 'eslint-plugin-node', 'eslint-plugin-jest'],
+  rules: {
+    '@typescript-eslint/no-require-imports': 'error',
+    '@typescript-eslint/no-non-null-assertion': 'off',
+    '@typescript-eslint/no-explicit-any': 'off',
+    '@typescript-eslint/no-empty-function': 'off',
+    '@typescript-eslint/ban-ts-comment': [
+      'error',
+      {
+        'ts-ignore': 'allow-with-description'
+      }
+    ],
+    'no-console': 'error',
+    'yoda': 'error',
+    'prefer-const': [
+      'error',
+      {
+        destructuring: 'all'
+      }
+    ],
+    'no-control-regex': 'off',
+    'no-constant-condition': ['error', {checkLoops: false}],
+    'node/no-extraneous-import': 'error'
+  },
+  overrides: [
+    {
+      files: ['**/*{test,spec}.ts'],
+      rules: {
+        '@typescript-eslint/no-unused-vars': 'off',
+        'jest/no-standalone-expect': 'off',
+        'jest/no-conditional-expect': 'off',
+        'no-console': 'off',
+
+      }
+    }
+  ],
+  env: {
+    node: true,
+    es6: true,
+    'jest/globals': true
+  }
+};

.eslintrc.js

@@ -1,5 +1,5 @@
 // This is a reusable configuration file copied from https://github.com/actions/reusable-workflows/tree/main/reusable-configurations. Please don't make changes to this file as it's the subject of an automatic update.
-module.exports = {
+export default {
   extends: [
     'eslint:recommended',
     'plugin:@typescript-eslint/recommended',

.prettierrc.js

@@ -1,5 +1,5 @@
 // This is a reusable configuration file copied from https://github.com/actions/reusable-workflows/tree/main/reusable-configurations. Please don't make changes to this file as it's the subject of an automatic update.
-module.exports = {
+export default {
   printWidth: 80,
   tabWidth: 2,
   useTabs: false,

__tests__/authutil.test.ts

@@ -16,9 +16,9 @@ let rcFile: string;
 describe('authutil tests', () => {
   const _runnerDir = path.join(__dirname, 'runner');
 
-  let cnSpy: any;
+  let cnSpy: ReturnType<typeof jest.spyOn>;
-  let logSpy: any;
+  let logSpy: ReturnType<typeof jest.spyOn>;
-  let dbgSpy: any;
+  let dbgSpy: ReturnType<typeof jest.spyOn>;
 
   beforeAll(async () => {
     const randPath = path.join(Math.random().toString(36).substring(7));

__tests__/main.test.ts

@@ -8,6 +8,7 @@ import fs from 'fs';
 import path from 'path';
 import osm from 'os';
 import {fileURLToPath} from 'url';
+import {jest, describe, beforeEach, afterEach, it, expect} from '@jest/globals';
 
 const __filename = fileURLToPath(import.meta.url);
 const __dirname = path.dirname(__filename);
@@ -22,26 +23,26 @@ describe('main tests', () => {
   let inputs = {} as any;
   let os = {} as any;
 
-  let infoSpy: jest.SpyInstance;
+  let infoSpy: ReturnType<typeof jest.spyOn>;
-  let warningSpy: jest.SpyInstance;
+  let warningSpy: ReturnType<typeof jest.spyOn>;
-  let saveStateSpy: jest.SpyInstance;
+  let saveStateSpy: ReturnType<typeof jest.spyOn>;
-  let inSpy: jest.SpyInstance;
+  let inSpy: ReturnType<typeof jest.spyOn>;
-  let setOutputSpy: jest.SpyInstance;
+  let setOutputSpy: ReturnType<typeof jest.spyOn>;
-  let startGroupSpy: jest.SpyInstance;
+  let startGroupSpy: ReturnType<typeof jest.spyOn>;
-  let endGroupSpy: jest.SpyInstance;
+  let endGroupSpy: ReturnType<typeof jest.spyOn>;
 
-  let whichSpy: jest.SpyInstance;
+  let whichSpy: ReturnType<typeof jest.spyOn>;
 
-  let existsSpy: jest.SpyInstance;
+  let existsSpy: ReturnType<typeof jest.spyOn>;
 
-  let getExecOutputSpy: jest.SpyInstance;
+  let getExecOutputSpy: ReturnType<typeof jest.spyOn>;
 
-  let getNodeVersionFromFileSpy: jest.SpyInstance;
+  let getNodeVersionFromFileSpy: ReturnType<typeof jest.spyOn>;
-  let cnSpy: jest.SpyInstance;
+  let cnSpy: ReturnType<typeof jest.spyOn>;
-  let findSpy: jest.SpyInstance;
+  let findSpy: ReturnType<typeof jest.spyOn>;
-  let isCacheActionAvailable: jest.SpyInstance;
+  let isCacheActionAvailable: ReturnType<typeof jest.spyOn>;
 
-  let setupNodeJsSpy: jest.SpyInstance;
+  let setupNodeJsSpy: ReturnType<typeof jest.spyOn>;
 
   beforeEach(() => {
     inputs = {};

jest.setup.js

@@ -1,5 +0,0 @@
-// Jest setup file to ensure globals are available in ESM mode
-import { jest } from '@jest/globals';
-
-// Make jest available globally
-globalThis.jest = jest;

package.json

@@ -12,8 +12,8 @@
     "build": "ncc build -o dist/setup src/setup-node.ts && ncc build -o dist/cache-save src/cache-save.ts",
     "format": "prettier --no-error-on-unmatched-pattern --config ./.prettierrc.js --write \"**/*.{ts,yml,yaml}\"",
     "format-check": "prettier --no-error-on-unmatched-pattern --config ./.prettierrc.js --check \"**/*.{ts,yml,yaml}\"",
-    "lint": "eslint --config ./.eslintrc.js \"**/*.ts\"",
+    "lint": "eslint --config ./.eslintrc.cjs \"**/*.ts\"",
-    "lint:fix": "eslint --config ./.eslintrc.js \"**/*.ts\" --fix",
+    "lint:fix": "eslint --config ./.eslintrc.cjs \"**/*.ts\" --fix",
     "test": "node --experimental-vm-modules node_modules/.bin/jest --coverage",
     "pre-checkin": "npm run format && npm run lint:fix && npm run build && npm test"
   },
@@ -41,6 +41,7 @@
     "uuid": "^11.1.0"
   },
   "devDependencies": {
+    "@jest/globals": "^30.2.0",
     "@types/jest": "^29.5.14",
     "@types/node": "^24.1.0",
     "@types/semver": "^7.5.8",