Migrate to ESM

.eslintignore

@@ -1,6 +0,0 @@
-# Ignore list
-/*
-
-# Do not ignore these folders:
-!__tests__/
-!src/

.eslintrc.js

@@ -1,51 +0,0 @@
-// 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
-  }
-};

.licensed.yml

@@ -10,7 +10,11 @@ allowed:
   - mit
   - cc0-1.0
   - unlicense
+  - blueoak-1.0.0
 
 reviewed:
   npm:
      - "@actions/http-client"
+     - balanced-match
+     - brace-expansion
+     - fast-content-type-parse

.prettierrc.js

@@ -1,11 +0,0 @@
-// 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 = {
-  printWidth: 80,
-  tabWidth: 2,
-  useTabs: false,
-  semi: true,
-  singleQuote: true,
-  trailingComma: 'none',
-  bracketSpacing: false,
-  arrowParens: 'avoid'
-};

.prettierrc.json

@@ -0,0 +1,10 @@
+{
+  "printWidth": 80,
+  "tabWidth": 2,
+  "useTabs": false,
+  "semi": true,
+  "singleQuote": true,
+  "trailingComma": "none",
+  "bracketSpacing": false,
+  "arrowParens": "avoid"
+}

__tests__/authutil.test.ts

@@ -1,19 +1,57 @@
+import {
+  jest,
+  describe,
+  it,
+  expect,
+  beforeAll,
+  beforeEach,
+  afterAll
+} from '@jest/globals';
+import {fileURLToPath} from 'url';
 import os from 'os';
 import fs from 'fs';
 import * as path from 'path';
-import * as core from '@actions/core';
 import * as io from '@actions/io';
-import * as auth from '../src/authutil';
-import * as cacheUtils from '../src/cache-utils';
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+
+jest.unstable_mockModule('@actions/core', () => ({
+  info: jest.fn(),
+  warning: jest.fn(),
+  debug: jest.fn(),
+  error: jest.fn(),
+  notice: jest.fn(),
+  setFailed: jest.fn(),
+  setOutput: jest.fn(),
+  getInput: jest.fn((name: string) => {
+    const val =
+      process.env[`INPUT_${name.replace(/ /g, '_').toUpperCase()}`] || '';
+    return val.trim();
+  }),
+  getBooleanInput: jest.fn(),
+  getMultilineInput: jest.fn(),
+  addPath: jest.fn(),
+  exportVariable: jest.fn(),
+  saveState: jest.fn(),
+  getState: jest.fn(),
+  setSecret: jest.fn(),
+  isDebug: jest.fn(() => false),
+  startGroup: jest.fn(),
+  endGroup: jest.fn(),
+  group: jest.fn((_name: string, fn: () => Promise<unknown>) => fn())
+}));
+
+// Dynamic imports AFTER mocking so authutil sees the mocked core.
+const core = await import('@actions/core');
+const auth = await import('../src/authutil.js');
 
 let rcFile: string;
 
 describe('authutil tests', () => {
   const _runnerDir = path.join(__dirname, 'runner');
 
-  let cnSpy: jest.SpyInstance;
-  let logSpy: jest.SpyInstance;
-  let dbgSpy: jest.SpyInstance;
+  let cnSpy: jest.SpiedFunction<typeof process.stdout.write>;
+  let logSpy: jest.SpiedFunction<typeof console.log>;
 
   beforeAll(async () => {
     const randPath = path.join(Math.random().toString(36).substring(7));
@@ -37,19 +75,8 @@ describe('authutil tests', () => {
     // writes
     cnSpy = jest.spyOn(process.stdout, 'write');
     logSpy = jest.spyOn(console, 'log');
-    dbgSpy = jest.spyOn(core, 'debug');
-    cnSpy.mockImplementation(line => {
-      // uncomment to debug
-      // process.stderr.write('write:' + line + '\n');
-    });
-    logSpy.mockImplementation(line => {
-      // uncomment to debug
-      // process.stderr.write('log:' + line + '\n');
-    });
-    dbgSpy.mockImplementation(msg => {
-      // uncomment to see debug output
-      // process.stderr.write(msg + '\n');
-    });
+    cnSpy.mockImplementation(() => true);
+    logSpy.mockImplementation(() => {});
   }, 100000);
 
   function dbg(message: string) {
@@ -119,7 +146,8 @@ describe('authutil tests', () => {
   });
 
   it('should not export NODE_AUTH_TOKEN if not set in environment', async () => {
-    const exportSpy = jest.spyOn(core, 'exportVariable');
+    const exportSpy = core.exportVariable as jest.Mock;
+    exportSpy.mockClear();
     delete process.env.NODE_AUTH_TOKEN;
     await auth.configAuthentication('https://registry.npmjs.org/');
     expect(fs.statSync(rcFile)).toBeDefined();
@@ -132,7 +160,8 @@ describe('authutil tests', () => {
   });
 
   it('should export NODE_AUTH_TOKEN if set to empty string', async () => {
-    const exportSpy = jest.spyOn(core, 'exportVariable');
+    const exportSpy = core.exportVariable as jest.Mock;
+    exportSpy.mockClear();
     process.env.NODE_AUTH_TOKEN = '';
     await auth.configAuthentication('https://registry.npmjs.org/');
     expect(fs.statSync(rcFile)).toBeDefined();

__tests__/cache-restore.test.ts

@@ -1,11 +1,67 @@
-import * as core from '@actions/core';
-import * as cache from '@actions/cache';
+import {jest, describe, it, expect, beforeEach, afterEach} from '@jest/globals';
+import {fileURLToPath} from 'url';
 import * as path from 'path';
-import * as glob from '@actions/glob';
 import osm from 'os';
 
-import * as utils from '../src/cache-utils';
-import {restoreCache} from '../src/cache-restore';
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+
+// Mock @actions modules before importing anything that depends on them
+jest.unstable_mockModule('@actions/core', () => ({
+  info: jest.fn(),
+  warning: jest.fn(),
+  debug: jest.fn(),
+  error: jest.fn(),
+  notice: jest.fn(),
+  setFailed: jest.fn(),
+  setOutput: jest.fn(),
+  getInput: jest.fn(),
+  getBooleanInput: jest.fn(),
+  getMultilineInput: jest.fn(),
+  addPath: jest.fn(),
+  exportVariable: jest.fn(),
+  saveState: jest.fn(),
+  getState: jest.fn(),
+  setSecret: jest.fn(),
+  isDebug: jest.fn(() => false),
+  startGroup: jest.fn(),
+  endGroup: jest.fn(),
+  group: jest.fn((_name: string, fn: () => Promise<unknown>) => fn()),
+  toPlatformPath: jest.fn((p: string) => p),
+  toWin32Path: jest.fn((p: string) => p),
+  toPosixPath: jest.fn((p: string) => p)
+}));
+
+jest.unstable_mockModule('@actions/cache', () => ({
+  saveCache: jest.fn(),
+  restoreCache: jest.fn(),
+  isFeatureAvailable: jest.fn()
+}));
+
+jest.unstable_mockModule('@actions/glob', () => ({
+  hashFiles: jest.fn(),
+  create: jest.fn()
+}));
+
+jest.unstable_mockModule('@actions/exec', () => ({
+  exec: jest.fn(),
+  getExecOutput: jest.fn()
+}));
+
+jest.unstable_mockModule('@actions/io', () => ({
+  which: jest.fn(),
+  mkdirP: jest.fn(),
+  rmRF: jest.fn(),
+  mv: jest.fn(),
+  cp: jest.fn()
+}));
+
+// Dynamic imports after mocking
+const core = await import('@actions/core');
+const cache = await import('@actions/cache');
+const glob = await import('@actions/glob');
+const exec = await import('@actions/exec');
+const utils = await import('../src/cache-utils.js');
+const {restoreCache} = await import('../src/cache-restore.js');
 
 describe('cache-restore', () => {
   const packageManagers = ['yarn', 'npm', 'pnpm'] as const;
@@ -53,32 +109,33 @@ describe('cache-restore', () => {
     }
   }
 
-  let saveStateSpy: jest.SpyInstance;
-  let infoSpy: jest.SpyInstance;
-  let debugSpy: jest.SpyInstance;
-  let setOutputSpy: jest.SpyInstance;
-  let getCommandOutputSpy: jest.SpyInstance;
-  let restoreCacheSpy: jest.SpyInstance;
-  let hashFilesSpy: jest.SpyInstance;
-  let archSpy: jest.SpyInstance;
+  let saveStateSpy: jest.Mock;
+  let infoSpy: jest.Mock;
+  let debugSpy: jest.Mock;
+  let setOutputSpy: jest.Mock;
+  let getExecOutputSpy: jest.Mock;
+  let restoreCacheSpy: jest.Mock;
+  let hashFilesSpy: jest.Mock;
+  let archSpy: jest.SpiedFunction<typeof osm.arch>;
 
   beforeEach(() => {
     // core
-    infoSpy = jest.spyOn(core, 'info');
+    infoSpy = core.info as jest.Mock;
     infoSpy.mockImplementation(() => undefined);
 
-    debugSpy = jest.spyOn(core, 'debug');
+    debugSpy = core.debug as jest.Mock;
     debugSpy.mockImplementation(() => undefined);
 
-    setOutputSpy = jest.spyOn(core, 'setOutput');
+    setOutputSpy = core.setOutput as jest.Mock;
     setOutputSpy.mockImplementation(() => undefined);
 
-    saveStateSpy = jest.spyOn(core, 'saveState');
+    saveStateSpy = core.saveState as jest.Mock;
     saveStateSpy.mockImplementation(() => undefined);
 
     // glob
-    hashFilesSpy = jest.spyOn(glob, 'hashFiles');
-    hashFilesSpy.mockImplementation((pattern: string) => {
+    hashFilesSpy = glob.hashFiles as jest.Mock;
+    (hashFilesSpy as jest.Mock<typeof glob.hashFiles>).mockImplementation(
+      async (pattern: string) => {
         if (pattern.includes('package-lock.json')) {
           return npmFileHash;
         } else if (pattern.includes('pnpm-lock.yaml')) {
@@ -88,12 +145,14 @@ describe('cache-restore', () => {
         } else {
           return '';
         }
-    });
+      }
+    );
 
     // cache
-    restoreCacheSpy = jest.spyOn(cache, 'restoreCache');
-    restoreCacheSpy.mockImplementation(
-      (cachePaths: Array<string>, key: string) => {
+    restoreCacheSpy = cache.restoreCache as jest.Mock;
+    (
+      restoreCacheSpy as jest.Mock<typeof cache.restoreCache>
+    ).mockImplementation(async (cachePaths: string[], key: string) => {
       if (!cachePaths || cachePaths.length === 0) {
         return undefined;
       }
@@ -106,11 +165,10 @@ describe('cache-restore', () => {
       }
 
       return undefined;
-      }
-    );
+    });
 
-    // cache-utils
-    getCommandOutputSpy = jest.spyOn(utils, 'getCommandOutput');
+    // exec
+    getExecOutputSpy = exec.getExecOutput as jest.Mock;
 
     // os
     archSpy = jest.spyOn(osm, 'arch');
@@ -134,18 +192,17 @@ describe('cache-restore', () => {
       ['yarn', '1.2.3', yarnFileHash],
       ['npm', '', npmFileHash],
       ['pnpm', '', pnpmFileHash]
-    ] as const)(
+    ])(
       'restored dependencies for %s',
       async (packageManager, toolVersion, fileHash) => {
-        // Set workspace to the appropriate fixture folder
-        setWorkspaceFor(packageManager);
-        getCommandOutputSpy.mockImplementation((command: string) => {
-          if (command.includes('version')) {
-            return toolVersion;
-          } else {
-            return findCacheFolder(command);
-          }
-        });
+        setWorkspaceFor(packageManager as PackageManager);
+        getExecOutputSpy.mockImplementation(async (command: any) => ({
+          stdout: command.includes('version')
+            ? toolVersion
+            : findCacheFolder(command),
+          stderr: '',
+          exitCode: 0
+        }));
 
         await restoreCache(packageManager, '');
         expect(hashFilesSpy).toHaveBeenCalled();
@@ -166,18 +223,17 @@ describe('cache-restore', () => {
       ['yarn', '1.2.3', yarnFileHash],
       ['npm', '', npmFileHash],
       ['pnpm', '', pnpmFileHash]
-    ] as const)(
+    ])(
       'dependencies are changed %s',
       async (packageManager, toolVersion, fileHash) => {
-        // Set workspace to the appropriate fixture folder
-        setWorkspaceFor(packageManager);
-        getCommandOutputSpy.mockImplementation((command: string) => {
-          if (command.includes('version')) {
-            return toolVersion;
-          } else {
-            return findCacheFolder(command);
-          }
-        });
+        setWorkspaceFor(packageManager as PackageManager);
+        getExecOutputSpy.mockImplementation(async (command: any) => ({
+          stdout: command.includes('version')
+            ? toolVersion
+            : findCacheFolder(command),
+          stderr: '',
+          exitCode: 0
+        }));
 
         restoreCacheSpy.mockImplementationOnce(() => undefined);
         await restoreCache(packageManager, '');

__tests__/cache-save.test.ts

@@ -1,12 +1,74 @@
-import * as core from '@actions/core';
-import * as cache from '@actions/cache';
-import * as glob from '@actions/glob';
-import fs from 'fs';
+import {jest, describe, it, expect, beforeEach, afterEach} from '@jest/globals';
+import {fileURLToPath} from 'url';
 import path from 'path';
+import fs from 'fs';
 
-import * as utils from '../src/cache-utils';
-import {run} from '../src/cache-save';
-import {State} from '../src/constants';
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+
+// Mock @actions modules before importing anything that depends on them
+jest.unstable_mockModule('@actions/core', () => ({
+  info: jest.fn(),
+  warning: jest.fn(),
+  debug: jest.fn(),
+  error: jest.fn(),
+  notice: jest.fn(),
+  setFailed: jest.fn(),
+  setOutput: jest.fn(),
+  getInput: jest.fn(),
+  getBooleanInput: jest.fn(),
+  getMultilineInput: jest.fn(),
+  addPath: jest.fn(),
+  exportVariable: jest.fn(),
+  saveState: jest.fn(),
+  getState: jest.fn(),
+  setSecret: jest.fn(),
+  isDebug: jest.fn(() => false),
+  startGroup: jest.fn(),
+  endGroup: jest.fn(),
+  group: jest.fn((_name: string, fn: () => Promise<unknown>) => fn()),
+  toPlatformPath: jest.fn((p: string) => p),
+  toWin32Path: jest.fn((p: string) => p),
+  toPosixPath: jest.fn((p: string) => p)
+}));
+
+jest.unstable_mockModule('@actions/cache', () => ({
+  saveCache: jest.fn(),
+  restoreCache: jest.fn(),
+  isFeatureAvailable: jest.fn(),
+  ValidationError: class ValidationError extends Error {
+    constructor(message: string) {
+      super(message);
+      this.name = 'ValidationError';
+    }
+  }
+}));
+
+jest.unstable_mockModule('@actions/glob', () => ({
+  hashFiles: jest.fn(),
+  create: jest.fn()
+}));
+
+jest.unstable_mockModule('@actions/exec', () => ({
+  exec: jest.fn(),
+  getExecOutput: jest.fn()
+}));
+
+jest.unstable_mockModule('@actions/io', () => ({
+  which: jest.fn(),
+  mkdirP: jest.fn(),
+  rmRF: jest.fn(),
+  mv: jest.fn(),
+  cp: jest.fn()
+}));
+
+// Dynamic imports after mocking
+const core = await import('@actions/core');
+const cache = await import('@actions/cache');
+const glob = await import('@actions/glob');
+const exec = await import('@actions/exec');
+const utils = await import('../src/cache-utils.js');
+const {run} = await import('../src/cache-save.js');
+const {State} = await import('../src/constants.js');
 
 describe('run', () => {
   const yarnFileHash =
@@ -20,42 +82,42 @@ describe('run', () => {
 
   const inputs = {} as any;
 
-  let getInputSpy: jest.SpyInstance;
-  let infoSpy: jest.SpyInstance;
-  let warningSpy: jest.SpyInstance;
-  let debugSpy: jest.SpyInstance;
-  let setFailedSpy: jest.SpyInstance;
-  let getStateSpy: jest.SpyInstance;
-  let saveCacheSpy: jest.SpyInstance;
-  let getCommandOutputSpy: jest.SpyInstance;
-  let hashFilesSpy: jest.SpyInstance;
-  let existsSpy: jest.SpyInstance;
+  let getInputSpy: jest.Mock;
+  let infoSpy: jest.Mock;
+  let warningSpy: jest.Mock;
+  let debugSpy: jest.Mock;
+  let setFailedSpy: jest.Mock;
+  let getStateSpy: jest.Mock;
+  let saveCacheSpy: jest.Mock;
+  let getExecOutputSpy: jest.Mock;
+  let hashFilesSpy: jest.Mock;
+  let existsSpy: jest.SpiedFunction<typeof fs.existsSync>;
 
   beforeEach(() => {
-    getInputSpy = jest.spyOn(core, 'getInput');
-    getInputSpy.mockImplementation((name: string) => inputs[name]);
+    getInputSpy = core.getInput as jest.Mock;
+    getInputSpy.mockImplementation((name: any) => inputs[name]);
 
-    infoSpy = jest.spyOn(core, 'info');
+    infoSpy = core.info as jest.Mock;
     infoSpy.mockImplementation(() => undefined);
 
-    warningSpy = jest.spyOn(core, 'warning');
+    warningSpy = core.warning as jest.Mock;
     warningSpy.mockImplementation(() => undefined);
 
-    setFailedSpy = jest.spyOn(core, 'setFailed');
+    setFailedSpy = core.setFailed as jest.Mock;
     setFailedSpy.mockImplementation(() => undefined);
 
-    debugSpy = jest.spyOn(core, 'debug');
+    debugSpy = core.debug as jest.Mock;
     debugSpy.mockImplementation(() => undefined);
 
-    getStateSpy = jest.spyOn(core, 'getState');
+    getStateSpy = core.getState as jest.Mock;
 
     // cache
-    saveCacheSpy = jest.spyOn(cache, 'saveCache');
+    saveCacheSpy = cache.saveCache as jest.Mock;
     saveCacheSpy.mockImplementation(() => undefined);
 
     // glob
-    hashFilesSpy = jest.spyOn(glob, 'hashFiles');
-    hashFilesSpy.mockImplementation((pattern: string) => {
+    hashFilesSpy = glob.hashFiles as jest.Mock;
+    hashFilesSpy.mockImplementation((pattern: any) => {
       if (pattern.includes('package-lock.json')) {
         return npmFileHash;
       } else if (pattern.includes('yarn.lock')) {
@@ -68,17 +130,20 @@ describe('run', () => {
     existsSpy = jest.spyOn(fs, 'existsSync');
     existsSpy.mockImplementation(() => true);
 
-    // utils
-    getCommandOutputSpy = jest.spyOn(utils, 'getCommandOutput');
+    // exec
+    getExecOutputSpy = exec.getExecOutput as jest.Mock;
   });
 
   afterEach(() => {
     existsSpy.mockRestore();
+    jest.resetAllMocks();
+    jest.clearAllMocks();
   });
 
   describe('Package manager validation', () => {
     it('Package manager is not provided, skip caching', async () => {
       inputs['cache'] = '';
+      getStateSpy.mockImplementation(() => '');
 
       await run();
 
@@ -124,7 +189,7 @@ describe('run', () => {
 
       expect(getInputSpy).not.toHaveBeenCalled();
       expect(getStateSpy).toHaveBeenCalledTimes(4);
-      expect(getCommandOutputSpy).toHaveBeenCalledTimes(0);
+      expect(getExecOutputSpy).toHaveBeenCalledTimes(0);
       expect(debugSpy).toHaveBeenCalledTimes(0);
       expect(infoSpy).toHaveBeenCalledWith(
         `Cache hit occurred on the primary key ${yarnFileHash}, not saving cache.`
@@ -148,7 +213,7 @@ describe('run', () => {
 
       expect(getInputSpy).not.toHaveBeenCalled();
       expect(getStateSpy).toHaveBeenCalledTimes(4);
-      expect(getCommandOutputSpy).toHaveBeenCalledTimes(0);
+      expect(getExecOutputSpy).toHaveBeenCalledTimes(0);
       expect(debugSpy).toHaveBeenCalledTimes(0);
       expect(infoSpy).toHaveBeenCalledWith(
         `Cache hit occurred on the primary key ${yarnFileHash}, not saving cache.`
@@ -167,13 +232,17 @@ describe('run', () => {
               ? '["/foo/bar"]'
               : 'not expected'
       );
-      getCommandOutputSpy.mockImplementationOnce(() => `${commonPath}/npm`);
+      getExecOutputSpy.mockImplementationOnce(() => ({
+        stdout: `${commonPath}/npm`,
+        stderr: '',
+        exitCode: 0
+      }));
 
       await run();
 
       expect(getInputSpy).not.toHaveBeenCalled();
       expect(getStateSpy).toHaveBeenCalledTimes(4);
-      expect(getCommandOutputSpy).toHaveBeenCalledTimes(0);
+      expect(getExecOutputSpy).toHaveBeenCalledTimes(0);
       expect(debugSpy).toHaveBeenCalledTimes(0);
       expect(setFailedSpy).not.toHaveBeenCalled();
     });
@@ -194,7 +263,7 @@ describe('run', () => {
 
       expect(getInputSpy).not.toHaveBeenCalled();
       expect(getStateSpy).toHaveBeenCalledTimes(4);
-      expect(getCommandOutputSpy).toHaveBeenCalledTimes(0);
+      expect(getExecOutputSpy).toHaveBeenCalledTimes(0);
       expect(debugSpy).toHaveBeenCalledTimes(0);
       expect(setFailedSpy).not.toHaveBeenCalled();
     });
@@ -203,7 +272,7 @@ describe('run', () => {
   describe('action saves the cache', () => {
     it('saves cache from yarn 1', async () => {
       inputs['cache'] = 'yarn';
-      getStateSpy.mockImplementation((key: string) =>
+      getStateSpy.mockImplementation((key: any) =>
         key === State.CachePackageManager
           ? inputs['cache']
           : key === State.CacheMatchedKey
@@ -219,7 +288,7 @@ describe('run', () => {
 
       expect(getInputSpy).not.toHaveBeenCalled();
       expect(getStateSpy).toHaveBeenCalledTimes(4);
-      expect(getCommandOutputSpy).toHaveBeenCalledTimes(0);
+      expect(getExecOutputSpy).toHaveBeenCalledTimes(0);
       expect(debugSpy).toHaveBeenCalledTimes(0);
       expect(infoSpy).not.toHaveBeenCalledWith(
         `Cache hit occurred on the primary key ${yarnFileHash}, not saving cache.`
@@ -233,7 +302,7 @@ describe('run', () => {
 
     it('saves cache from yarn 2', async () => {
       inputs['cache'] = 'yarn';
-      getStateSpy.mockImplementation((key: string) =>
+      getStateSpy.mockImplementation((key: any) =>
         key === State.CachePackageManager
           ? inputs['cache']
           : key === State.CacheMatchedKey
@@ -249,7 +318,7 @@ describe('run', () => {
 
       expect(getInputSpy).not.toHaveBeenCalled();
       expect(getStateSpy).toHaveBeenCalledTimes(4);
-      expect(getCommandOutputSpy).toHaveBeenCalledTimes(0);
+      expect(getExecOutputSpy).toHaveBeenCalledTimes(0);
       expect(debugSpy).toHaveBeenCalledTimes(0);
       expect(infoSpy).not.toHaveBeenCalledWith(
         `Cache hit occurred on the primary key ${yarnFileHash}, not saving cache.`
@@ -263,7 +332,7 @@ describe('run', () => {
 
     it('saves cache from npm', async () => {
       inputs['cache'] = 'npm';
-      getStateSpy.mockImplementation((key: string) =>
+      getStateSpy.mockImplementation((key: any) =>
         key === State.CachePackageManager
           ? inputs['cache']
           : key === State.CacheMatchedKey
@@ -279,7 +348,7 @@ describe('run', () => {
 
       expect(getInputSpy).not.toHaveBeenCalled();
       expect(getStateSpy).toHaveBeenCalledTimes(4);
-      expect(getCommandOutputSpy).toHaveBeenCalledTimes(0);
+      expect(getExecOutputSpy).toHaveBeenCalledTimes(0);
       expect(debugSpy).toHaveBeenCalledTimes(0);
       expect(infoSpy).not.toHaveBeenCalledWith(
         `Cache hit occurred on the primary key ${npmFileHash}, not saving cache.`
@@ -293,7 +362,7 @@ describe('run', () => {
 
     it('saves cache from pnpm', async () => {
       inputs['cache'] = 'pnpm';
-      getStateSpy.mockImplementation((key: string) =>
+      getStateSpy.mockImplementation((key: any) =>
         key === State.CachePackageManager
           ? inputs['cache']
           : key === State.CacheMatchedKey
@@ -309,7 +378,7 @@ describe('run', () => {
 
       expect(getInputSpy).not.toHaveBeenCalled();
       expect(getStateSpy).toHaveBeenCalledTimes(4);
-      expect(getCommandOutputSpy).toHaveBeenCalledTimes(0);
+      expect(getExecOutputSpy).toHaveBeenCalledTimes(0);
       expect(debugSpy).toHaveBeenCalledTimes(0);
       expect(infoSpy).not.toHaveBeenCalledWith(
         `Cache hit occurred on the primary key ${pnpmFileHash}, not saving cache.`
@@ -323,7 +392,7 @@ describe('run', () => {
 
     it('save with -1 cacheId , should not fail workflow', async () => {
       inputs['cache'] = 'npm';
-      getStateSpy.mockImplementation((key: string) =>
+      getStateSpy.mockImplementation((key: any) =>
         key === State.CachePackageManager
           ? inputs['cache']
           : key === State.CacheMatchedKey
@@ -342,8 +411,8 @@ describe('run', () => {
 
       expect(getInputSpy).not.toHaveBeenCalled();
       expect(getStateSpy).toHaveBeenCalledTimes(4);
-      expect(getCommandOutputSpy).toHaveBeenCalledTimes(0);
-      expect(debugSpy).toHaveBeenLastCalledWith(
+      expect(getExecOutputSpy).toHaveBeenCalledTimes(0);
+      expect(debugSpy).toHaveBeenCalledWith(
         `Cache was not saved for the key: ${yarnFileHash}`
       );
       expect(infoSpy).not.toHaveBeenCalledWith(
@@ -358,7 +427,7 @@ describe('run', () => {
 
     it('saves with error from toolkit, should fail workflow', async () => {
       inputs['cache'] = 'npm';
-      getStateSpy.mockImplementation((key: string) =>
+      getStateSpy.mockImplementation((key: any) =>
         key === State.CachePackageManager
           ? inputs['cache']
           : key === State.CacheMatchedKey
@@ -377,7 +446,7 @@ describe('run', () => {
 
       expect(getInputSpy).not.toHaveBeenCalled();
       expect(getStateSpy).toHaveBeenCalledTimes(4);
-      expect(getCommandOutputSpy).toHaveBeenCalledTimes(0);
+      expect(getExecOutputSpy).toHaveBeenCalledTimes(0);
       expect(debugSpy).toHaveBeenCalledTimes(0);
       expect(infoSpy).not.toHaveBeenCalledWith(
         `Cache hit occurred on the primary key ${npmFileHash}, not saving cache.`
@@ -386,9 +455,4 @@ describe('run', () => {
       expect(setFailedSpy).toHaveBeenCalled();
     });
   });
-
-  afterEach(() => {
-    jest.resetAllMocks();
-    jest.clearAllMocks();
-  });
 });

__tests__/cache-utils.test.ts

@@ -1,45 +1,133 @@
-import * as core from '@actions/core';
-import * as cache from '@actions/cache';
-import path from 'path';
-import * as utils from '../src/cache-utils';
 import {
-  PackageManagerInfo,
+  jest,
+  describe,
+  it,
+  expect,
+  beforeEach,
+  afterEach,
+  afterAll
+} from '@jest/globals';
+import {fileURLToPath} from 'url';
+import path from 'path';
+import fs from 'fs';
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+
+// Mock @actions modules before importing anything that depends on them
+jest.unstable_mockModule('@actions/core', () => ({
+  info: jest.fn(),
+  warning: jest.fn(),
+  debug: jest.fn(),
+  error: jest.fn(),
+  notice: jest.fn(),
+  setFailed: jest.fn(),
+  setOutput: jest.fn(),
+  getInput: jest.fn(),
+  getBooleanInput: jest.fn(),
+  getMultilineInput: jest.fn(),
+  addPath: jest.fn(),
+  exportVariable: jest.fn(),
+  saveState: jest.fn(),
+  getState: jest.fn(),
+  setSecret: jest.fn(),
+  isDebug: jest.fn(() => false),
+  startGroup: jest.fn(),
+  endGroup: jest.fn(),
+  group: jest.fn((_name: string, fn: () => Promise<unknown>) => fn()),
+  toPlatformPath: jest.fn((p: string) => p),
+  toWin32Path: jest.fn((p: string) => p),
+  toPosixPath: jest.fn((p: string) => p)
+}));
+
+jest.unstable_mockModule('@actions/cache', () => ({
+  saveCache: jest.fn(),
+  restoreCache: jest.fn(),
+  isFeatureAvailable: jest.fn()
+}));
+
+jest.unstable_mockModule('@actions/glob', () => ({
+  hashFiles: jest.fn(),
+  create: jest.fn()
+}));
+
+jest.unstable_mockModule('@actions/exec', () => ({
+  exec: jest.fn(),
+  getExecOutput: jest.fn()
+}));
+
+jest.unstable_mockModule('@actions/io', () => ({
+  which: jest.fn(),
+  mkdirP: jest.fn(),
+  rmRF: jest.fn(),
+  mv: jest.fn(),
+  cp: jest.fn()
+}));
+
+// Dynamic imports after mocking
+const core = await import('@actions/core');
+const cache = await import('@actions/cache');
+const glob = await import('@actions/glob');
+const exec = await import('@actions/exec');
+const utils = await import('../src/cache-utils.js');
+const cacheUtils = await import('../src/cache-utils.js');
+// @ts-ignore - test file outside rootDir
+const {MockGlobber} = await import('./mock/glob-mock.js');
+
+import type {PackageManagerInfo} from '../src/cache-utils.js';
+
+const {
   isCacheFeatureAvailable,
   supportedPackageManagers,
   isGhes,
   resetProjectDirectoriesMemoized
-} from '../src/cache-utils';
-import fs from 'fs';
-import * as cacheUtils from '../src/cache-utils';
-import * as glob from '@actions/glob';
-import {Globber} from '@actions/glob';
-import {MockGlobber} from './mock/glob-mock';
+} = utils;
+
+// Helper: mock exec.getExecOutput to simulate getCommandOutput behavior
+function mockGetCommandOutput(
+  spy: jest.Mock,
+  fn: (command: string, cwd?: string) => string
+) {
+  spy.mockImplementation(async (command: any, _args: any, options: any) => ({
+    stdout: fn(command, options?.cwd),
+    stderr: '',
+    exitCode: 0
+  }));
+}
+
+function mockGetCommandOutputOnce(spy: jest.Mock, result: string) {
+  spy.mockImplementationOnce(async () => ({
+    stdout: result,
+    stderr: '',
+    exitCode: 0
+  }));
+}
 
 describe('cache-utils', () => {
   const versionYarn1 = '1.2.3';
 
-  let debugSpy: jest.SpyInstance;
-  let getCommandOutputSpy: jest.SpyInstance;
-  let isFeatureAvailable: jest.SpyInstance;
-  let info: jest.SpyInstance;
-  let warningSpy: jest.SpyInstance;
-  let fsRealPathSyncSpy: jest.SpyInstance;
+  let debugSpy: jest.Mock;
+  let getExecOutputSpy: jest.Mock;
+  let isFeatureAvailable: jest.Mock;
+  let info: jest.Mock;
+  let warningSpy: jest.Mock;
+  let fsRealPathSyncSpy: jest.SpiedFunction<typeof fs.realpathSync>;
 
   beforeEach(() => {
     console.log('::stop-commands::stoptoken');
     process.env['GITHUB_WORKSPACE'] = path.join(__dirname, 'data');
-    debugSpy = jest.spyOn(core, 'debug');
-    debugSpy.mockImplementation(msg => {});
 
-    info = jest.spyOn(core, 'info');
-    warningSpy = jest.spyOn(core, 'warning');
+    debugSpy = core.debug as jest.Mock;
+    debugSpy.mockImplementation((_msg: any) => {});
 
-    isFeatureAvailable = jest.spyOn(cache, 'isFeatureAvailable');
+    info = core.info as jest.Mock;
+    warningSpy = core.warning as jest.Mock;
 
-    getCommandOutputSpy = jest.spyOn(utils, 'getCommandOutput');
+    isFeatureAvailable = cache.isFeatureAvailable as jest.Mock;
+
+    getExecOutputSpy = exec.getExecOutput as jest.Mock;
 
     fsRealPathSyncSpy = jest.spyOn(fs, 'realpathSync');
-    fsRealPathSyncSpy.mockImplementation(dirName => {
+    fsRealPathSyncSpy.mockImplementation((dirName: any) => {
       return dirName;
     });
   });
@@ -47,7 +135,6 @@ describe('cache-utils', () => {
   afterEach(() => {
     jest.resetAllMocks();
     jest.clearAllMocks();
-    //jest.restoreAllMocks();
   });
 
   afterAll(async () => {
@@ -64,7 +151,7 @@ describe('cache-utils', () => {
       ['yarn2', null],
       ['npm7', null]
     ])('getPackageManagerInfo for %s is %o', async (packageManager, result) => {
-      getCommandOutputSpy.mockImplementationOnce(() => versionYarn1);
+      mockGetCommandOutputOnce(getExecOutputSpy, versionYarn1);
       await expect(utils.getPackageManagerInfo(packageManager)).resolves.toBe(
         result
       );
@@ -92,7 +179,6 @@ describe('cache-utils', () => {
 
   it('isCacheFeatureAvailable for GHES is available', () => {
     isFeatureAvailable.mockImplementation(() => true);
-
     expect(isCacheFeatureAvailable()).toStrictEqual(true);
   });
 
@@ -103,23 +189,21 @@ describe('cache-utils', () => {
   });
 
   describe('getCacheDirectoriesPaths', () => {
-    let existsSpy: jest.SpyInstance;
-    let lstatSpy: jest.SpyInstance;
-    let globCreateSpy: jest.SpyInstance;
+    let existsSpy: jest.SpiedFunction<typeof fs.existsSync>;
+    let lstatSpy: jest.SpiedFunction<typeof fs.lstatSync>;
+    let globCreateSpy: jest.Mock;
 
     beforeEach(() => {
       existsSpy = jest.spyOn(fs, 'existsSync');
       existsSpy.mockImplementation(() => true);
 
       lstatSpy = jest.spyOn(fs, 'lstatSync');
-      lstatSpy.mockImplementation(arg => ({
-        isDirectory: () => true
-      }));
+      lstatSpy.mockImplementation(
+        (_arg: any) => ({isDirectory: () => true}) as any
+      );
 
-      globCreateSpy = jest.spyOn(glob, 'create');
-
-      globCreateSpy.mockImplementation(
-        (pattern: string): Promise<Globber> =>
+      globCreateSpy = glob.create as jest.Mock;
+      globCreateSpy.mockImplementation((_pattern: any) =>
         MockGlobber.create(['/foo', '/bar'])
       );
 
@@ -129,7 +213,6 @@ describe('cache-utils', () => {
     afterEach(() => {
       existsSpy.mockRestore();
       lstatSpy.mockRestore();
-      globCreateSpy.mockRestore();
     });
 
     it.each([
@@ -142,22 +225,18 @@ describe('cache-utils', () => {
     ])(
       'getCacheDirectoriesPaths should return one dir for non yarn',
       async (packageManagerInfo, cacheDependency) => {
-        getCommandOutputSpy.mockImplementation(() => 'foo');
-
+        mockGetCommandOutput(getExecOutputSpy, () => 'foo');
         const dirs = await cacheUtils.getCacheDirectories(
           packageManagerInfo,
           cacheDependency
         );
         expect(dirs).toEqual(['foo']);
-        // to do not call for a version
-        // call once for get cache folder
-        expect(getCommandOutputSpy).toHaveBeenCalledTimes(1);
+        expect(getExecOutputSpy).toHaveBeenCalledTimes(1);
       }
     );
 
     it('getCacheDirectoriesPaths should return one dir for yarn without cacheDependency', async () => {
-      getCommandOutputSpy.mockImplementation(() => 'foo');
-
+      mockGetCommandOutput(getExecOutputSpy, () => 'foo');
       const dirs = await cacheUtils.getCacheDirectories(
         supportedPackageManagers.yarn,
         ''
@@ -178,15 +257,12 @@ describe('cache-utils', () => {
     ])(
       'getCacheDirectoriesPaths should throw for getCommandOutput returning empty',
       async (packageManagerInfo, cacheDependency) => {
-        getCommandOutputSpy.mockImplementation((command: string) =>
-          // return empty string to indicate getCacheFolderPath failed
-          //        --version still works
+        mockGetCommandOutput(getExecOutputSpy, (command: string) =>
           command.includes('version') ? '1.' : ''
         );
-
         await expect(
           cacheUtils.getCacheDirectories(packageManagerInfo, cacheDependency)
-        ).rejects.toThrow(); //'Could not get cache folder path for /dir');
+        ).rejects.toThrow();
       }
     );
 
@@ -196,10 +272,9 @@ describe('cache-utils', () => {
     ])(
       'getCacheDirectoriesPaths should nothrow in case of having not directories',
       async (packageManagerInfo, cacheDependency) => {
-        lstatSpy.mockImplementation(arg => ({
-          isDirectory: () => false
-        }));
-
+        lstatSpy.mockImplementation(
+          (_arg: any) => ({isDirectory: () => false}) as any
+        );
         await cacheUtils.getCacheDirectories(
           packageManagerInfo,
           cacheDependency
@@ -214,9 +289,8 @@ describe('cache-utils', () => {
     it.each(['1.1.1', '2.2.2'])(
       'getCacheDirectoriesPaths yarn v%s should return one dir without cacheDependency',
       async version => {
-        getCommandOutputSpy.mockImplementationOnce(() => version);
-        getCommandOutputSpy.mockImplementationOnce(() => `foo${version}`);
-
+        mockGetCommandOutputOnce(getExecOutputSpy, version);
+        mockGetCommandOutputOnce(getExecOutputSpy, `foo${version}`);
         const dirs = await cacheUtils.getCacheDirectories(
           supportedPackageManagers.yarn,
           ''
@@ -229,14 +303,12 @@ describe('cache-utils', () => {
       'getCacheDirectoriesPaths yarn v%s should return 2 dirs with globbed cacheDependency',
       async version => {
         let dirNo = 1;
-        getCommandOutputSpy.mockImplementation((command: string) =>
+        mockGetCommandOutput(getExecOutputSpy, (command: string) =>
           command.includes('version') ? version : `file_${version}_${dirNo++}`
         );
-        globCreateSpy.mockImplementation(
-          (pattern: string): Promise<Globber> =>
+        globCreateSpy.mockImplementation((_pattern: any) =>
           MockGlobber.create(['/tmp/dir1/file', '/tmp/dir2/file'])
         );
-
         const dirs = await cacheUtils.getCacheDirectories(
           supportedPackageManagers.yarn,
           '/tmp/**/file'
@@ -249,18 +321,16 @@ describe('cache-utils', () => {
       'getCacheDirectoriesPaths yarn v%s should return 2 dirs  with globbed cacheDependency expanding to duplicates',
       async version => {
         let dirNo = 1;
-        getCommandOutputSpy.mockImplementation((command: string) =>
+        mockGetCommandOutput(getExecOutputSpy, (command: string) =>
           command.includes('version') ? version : `file_${version}_${dirNo++}`
         );
-        globCreateSpy.mockImplementation(
-          (pattern: string): Promise<Globber> =>
+        globCreateSpy.mockImplementation((_pattern: any) =>
           MockGlobber.create([
             '/tmp/dir1/file',
             '/tmp/dir2/file',
             '/tmp/dir1/file'
           ])
         );
-
         const dirs = await cacheUtils.getCacheDirectories(
           supportedPackageManagers.yarn,
           '/tmp/**/file'
@@ -273,55 +343,59 @@ describe('cache-utils', () => {
       'getCacheDirectoriesPaths yarn v%s should return 2 uniq dirs despite duplicate cache directories',
       async version => {
         let dirNo = 1;
-        getCommandOutputSpy.mockImplementation((command: string) =>
+        mockGetCommandOutput(getExecOutputSpy, (command: string) =>
           command.includes('version')
             ? version
             : `file_${version}_${dirNo++ % 2}`
         );
-        globCreateSpy.mockImplementation(
-          (pattern: string): Promise<Globber> =>
+        globCreateSpy.mockImplementation((_pattern: any) =>
           MockGlobber.create([
             '/tmp/dir1/file',
             '/tmp/dir2/file',
             '/tmp/dir3/file'
           ])
         );
-
         const dirs = await cacheUtils.getCacheDirectories(
           supportedPackageManagers.yarn,
           '/tmp/**/file'
         );
         expect(dirs).toEqual([`file_${version}_1`, `file_${version}_0`]);
-        expect(getCommandOutputSpy).toHaveBeenCalledTimes(6);
-        expect(getCommandOutputSpy).toHaveBeenCalledWith(
+        expect(getExecOutputSpy).toHaveBeenCalledTimes(6);
+        expect(getExecOutputSpy).toHaveBeenCalledWith(
           'yarn --version',
-          '/tmp/dir1'
+          undefined,
+          expect.objectContaining({cwd: '/tmp/dir1'})
         );
-        expect(getCommandOutputSpy).toHaveBeenCalledWith(
+        expect(getExecOutputSpy).toHaveBeenCalledWith(
           'yarn --version',
-          '/tmp/dir2'
+          undefined,
+          expect.objectContaining({cwd: '/tmp/dir2'})
         );
-        expect(getCommandOutputSpy).toHaveBeenCalledWith(
+        expect(getExecOutputSpy).toHaveBeenCalledWith(
           'yarn --version',
-          '/tmp/dir3'
+          undefined,
+          expect.objectContaining({cwd: '/tmp/dir3'})
         );
-        expect(getCommandOutputSpy).toHaveBeenCalledWith(
+        expect(getExecOutputSpy).toHaveBeenCalledWith(
           version.startsWith('1.')
             ? 'yarn cache dir'
             : 'yarn config get cacheFolder',
-          '/tmp/dir1'
+          undefined,
+          expect.objectContaining({cwd: '/tmp/dir1'})
         );
-        expect(getCommandOutputSpy).toHaveBeenCalledWith(
+        expect(getExecOutputSpy).toHaveBeenCalledWith(
           version.startsWith('1.')
             ? 'yarn cache dir'
             : 'yarn config get cacheFolder',
-          '/tmp/dir2'
+          undefined,
+          expect.objectContaining({cwd: '/tmp/dir2'})
         );
-        expect(getCommandOutputSpy).toHaveBeenCalledWith(
+        expect(getExecOutputSpy).toHaveBeenCalledWith(
           version.startsWith('1.')
             ? 'yarn cache dir'
             : 'yarn config get cacheFolder',
-          '/tmp/dir3'
+          undefined,
+          expect.objectContaining({cwd: '/tmp/dir3'})
         );
       }
     );
@@ -329,13 +403,11 @@ describe('cache-utils', () => {
     it.each(['1.1.1', '2.2.2'])(
       'getCacheDirectoriesPaths yarn v%s should return 4 dirs with multiple globs',
       async version => {
-        // simulate wrong indents
         const cacheDependencyPath = `/tmp/dir1/file
           /tmp/dir2/file
 /tmp/**/file
           `;
-        globCreateSpy.mockImplementation(
-          (pattern: string): Promise<Globber> =>
+        globCreateSpy.mockImplementation((_pattern: any) =>
           MockGlobber.create([
             '/tmp/dir1/file',
             '/tmp/dir2/file',
@@ -344,7 +416,7 @@ describe('cache-utils', () => {
           ])
         );
         let dirNo = 1;
-        getCommandOutputSpy.mockImplementation((command: string) =>
+        mockGetCommandOutput(getExecOutputSpy, (command: string) =>
           command.includes('version') ? version : `file_${version}_${dirNo++}`
         );
         const dirs = await cacheUtils.getCacheDirectories(

__tests__/canary-installer.test.ts

@@ -1,51 +1,162 @@
-import * as core from '@actions/core';
-import * as io from '@actions/io';
-import * as tc from '@actions/tool-cache';
-import * as httpm from '@actions/http-client';
-import * as exec from '@actions/exec';
-import * as cache from '@actions/cache';
+import {
+  jest,
+  describe,
+  it,
+  expect,
+  beforeEach,
+  afterEach,
+  afterAll
+} from '@jest/globals';
+import {fileURLToPath} from 'url';
 import fs from 'fs';
 import cp from 'child_process';
 import osm from 'os';
 import path from 'path';
-import * as main from '../src/main';
-import * as auth from '../src/authutil';
-import {INodeVersion} from '../src/distributions/base-models';
 
-import nodeTestManifest from './data/versions-manifest.json';
-import nodeTestDist from './data/node-dist-index.json';
-import nodeTestDistNightly from './data/node-nightly-index.json';
-import nodeTestDistRc from './data/node-rc-index.json';
-import nodeV8CanaryTestDist from './data/v8-canary-dist-index.json';
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+
+// Mock @actions modules before importing anything that depends on them
+jest.unstable_mockModule('@actions/core', () => ({
+  info: jest.fn(),
+  warning: jest.fn(),
+  debug: jest.fn(),
+  error: jest.fn(),
+  notice: jest.fn(),
+  setFailed: jest.fn(),
+  setOutput: jest.fn(),
+  getInput: jest.fn(),
+  getBooleanInput: jest.fn(),
+  getMultilineInput: jest.fn(),
+  addPath: jest.fn(),
+  exportVariable: jest.fn(),
+  saveState: jest.fn(),
+  getState: jest.fn(),
+  setSecret: jest.fn(),
+  isDebug: jest.fn(() => false),
+  startGroup: jest.fn(),
+  endGroup: jest.fn(),
+  group: jest.fn((_name: string, fn: () => Promise<unknown>) => fn()),
+  toPlatformPath: jest.fn((p: string) => p),
+  toWin32Path: jest.fn((p: string) => p),
+  toPosixPath: jest.fn((p: string) => p)
+}));
+
+jest.unstable_mockModule('@actions/io', () => ({
+  which: jest.fn(),
+  mkdirP: jest.fn(),
+  rmRF: jest.fn(),
+  mv: jest.fn(),
+  cp: jest.fn()
+}));
+
+jest.unstable_mockModule('@actions/tool-cache', () => ({
+  find: jest.fn(),
+  findAllVersions: jest.fn(),
+  downloadTool: jest.fn(),
+  extractTar: jest.fn(),
+  extractZip: jest.fn(),
+  extractXar: jest.fn(),
+  extract7z: jest.fn(),
+  cacheDir: jest.fn(),
+  cacheFile: jest.fn(),
+  getManifestFromRepo: jest.fn(),
+  findFromManifest: jest.fn(),
+  HTTPError: class HTTPError extends Error {
+    readonly httpStatusCode: number;
+    constructor(httpStatusCode?: number) {
+      super(`Unexpected HTTP response: ${httpStatusCode}`);
+      this.httpStatusCode = httpStatusCode ?? 0;
+    }
+  }
+}));
+
+const _mockGetJson = jest.fn();
+jest.unstable_mockModule('@actions/http-client', () => ({
+  HttpClient: jest.fn().mockImplementation(() => ({
+    getJson: _mockGetJson
+  }))
+}));
+
+jest.unstable_mockModule('@actions/exec', () => ({
+  exec: jest.fn(),
+  getExecOutput: jest.fn()
+}));
+
+jest.unstable_mockModule('@actions/cache', () => ({
+  saveCache: jest.fn(),
+  restoreCache: jest.fn(),
+  isFeatureAvailable: jest.fn()
+}));
+
+// Pre-import real authutil before mocking
+const realAuth = await import('../src/authutil.js');
+jest.unstable_mockModule('../src/authutil.js', () => ({
+  ...realAuth,
+  configAuthentication: jest.fn()
+}));
+
+// Dynamic imports after mocking
+const core = await import('@actions/core');
+const io = await import('@actions/io');
+const tc = await import('@actions/tool-cache');
+const httpm = await import('@actions/http-client');
+const exec = await import('@actions/exec');
+const cache = await import('@actions/cache');
+const main = await import('../src/main.js');
+const auth = await import('../src/authutil.js');
+
+const {default: nodeTestManifest} = await import(
+  './data/versions-manifest.json',
+  {with: {type: 'json'}}
+);
+const {default: nodeTestDist} = await import('./data/node-dist-index.json', {
+  with: {type: 'json'}
+});
+const {default: nodeTestDistNightly} = await import(
+  './data/node-nightly-index.json',
+  {with: {type: 'json'}}
+);
+const {default: nodeTestDistRc} = await import('./data/node-rc-index.json', {
+  with: {type: 'json'}
+});
+const {default: nodeV8CanaryTestDist} = await import(
+  './data/v8-canary-dist-index.json',
+  {with: {type: 'json'}}
+);
+
+import type {INodeVersion} from '../src/distributions/base-models.js';
+import type {IToolRelease} from '@actions/tool-cache';
 
 describe('setup-node', () => {
   let inputs = {} as any;
   let os = {} as any;
 
-  let inSpy: jest.SpyInstance;
-  let findSpy: jest.SpyInstance;
-  let findAllVersionsSpy: jest.SpyInstance;
-  let cnSpy: jest.SpyInstance;
-  let logSpy: jest.SpyInstance;
-  let warningSpy: jest.SpyInstance;
-  let getManifestSpy: jest.SpyInstance;
-  let getDistSpy: jest.SpyInstance;
-  let platSpy: jest.SpyInstance;
-  let archSpy: jest.SpyInstance;
-  let dlSpy: jest.SpyInstance;
-  let exSpy: jest.SpyInstance;
-  let cacheSpy: jest.SpyInstance;
-  let dbgSpy: jest.SpyInstance;
-  let whichSpy: jest.SpyInstance;
-  let existsSpy: jest.SpyInstance;
-  let readFileSyncSpy: jest.SpyInstance;
-  let mkdirpSpy: jest.SpyInstance;
-  let execSpy: jest.SpyInstance;
-  let authSpy: jest.SpyInstance;
-  let parseNodeVersionSpy: jest.SpyInstance;
-  let isCacheActionAvailable: jest.SpyInstance;
-  let getExecOutputSpy: jest.SpyInstance;
-  let getJsonSpy: jest.SpyInstance;
+  let inSpy: jest.Mock;
+  let findSpy: jest.Mock;
+  let findAllVersionsSpy: jest.Mock;
+  let cnSpy: jest.SpiedFunction<typeof process.stdout.write>;
+  let logSpy: jest.Mock;
+  let warningSpy: jest.Mock;
+  let addPathSpy: jest.Mock;
+  let setFailedSpy: jest.Mock;
+  let getManifestSpy: jest.Mock;
+  let getDistSpy: jest.Mock;
+  let platSpy: jest.SpiedFunction<typeof osm.platform>;
+  let archSpy: jest.SpiedFunction<typeof osm.arch>;
+  let dlSpy: jest.Mock;
+  let exSpy: jest.Mock;
+  let cacheSpy: jest.Mock;
+  let dbgSpy: jest.Mock;
+  let whichSpy: jest.Mock;
+  let existsSpy: jest.SpiedFunction<typeof fs.existsSync>;
+  let readFileSyncSpy: jest.Mock;
+  let mkdirpSpy: jest.Mock;
+  let execSpy: jest.SpiedFunction<typeof cp.execSync>;
+  let authSpy: jest.Mock;
+  let parseNodeVersionSpy: jest.Mock;
+  let isCacheActionAvailable: jest.Mock;
+  let getExecOutputSpy: jest.Mock;
+  let getJsonSpy: jest.Mock;
 
   beforeEach(() => {
     // @actions/core
@@ -53,8 +164,8 @@ describe('setup-node', () => {
     process.env['GITHUB_PATH'] = ''; // Stub out ENV file functionality so we can verify it writes to standard out
     process.env['GITHUB_OUTPUT'] = ''; // Stub out ENV file functionality so we can verify it writes to standard out
     inputs = {};
-    inSpy = jest.spyOn(core, 'getInput');
-    inSpy.mockImplementation(name => inputs[name]);
+    inSpy = core.getInput as jest.Mock;
+    inSpy.mockImplementation((name: any) => inputs[name]);
 
     // node
     os = {};
@@ -65,34 +176,35 @@ describe('setup-node', () => {
     execSpy = jest.spyOn(cp, 'execSync');
 
     // @actions/tool-cache
-    findSpy = jest.spyOn(tc, 'find');
-    findAllVersionsSpy = jest.spyOn(tc, 'findAllVersions');
-    dlSpy = jest.spyOn(tc, 'downloadTool');
-    exSpy = jest.spyOn(tc, 'extractTar');
-    cacheSpy = jest.spyOn(tc, 'cacheDir');
-    getManifestSpy = jest.spyOn(tc, 'getManifestFromRepo');
+    findSpy = tc.find as jest.Mock;
+    findAllVersionsSpy = tc.findAllVersions as jest.Mock;
+    dlSpy = tc.downloadTool as jest.Mock;
+    exSpy = tc.extractTar as jest.Mock;
+    cacheSpy = tc.cacheDir as jest.Mock;
+    getManifestSpy = tc.getManifestFromRepo as jest.Mock;
 
     // http-client
-    getJsonSpy = jest.spyOn(httpm.HttpClient.prototype, 'getJson');
+    getJsonSpy = _mockGetJson;
+    (httpm.HttpClient as jest.Mock).mockImplementation(() => ({
+      getJson: _mockGetJson
+    }));
 
     // io
-    whichSpy = jest.spyOn(io, 'which');
+    whichSpy = io.which as jest.Mock;
     existsSpy = jest.spyOn(fs, 'existsSync');
-    mkdirpSpy = jest.spyOn(io, 'mkdirP');
+    mkdirpSpy = io.mkdirP as jest.Mock;
 
     // @actions/tool-cache
-    isCacheActionAvailable = jest.spyOn(cache, 'isFeatureAvailable');
+    isCacheActionAvailable = cache.isFeatureAvailable as jest.Mock;
 
     // disable authentication portion for installer tests
-    authSpy = jest.spyOn(auth, 'configAuthentication');
+    authSpy = auth.configAuthentication as jest.Mock;
     authSpy.mockImplementation(() => {});
 
     // gets
-    getManifestSpy.mockImplementation(
-      () => <tc.IToolRelease[]>nodeTestManifest
-    );
+    getManifestSpy.mockImplementation(() => <IToolRelease[]>nodeTestManifest);
 
-    getJsonSpy.mockImplementation(url => {
+    getJsonSpy.mockImplementation((url: any) => {
       let res: any;
       if (url.includes('/rc')) {
         res = <INodeVersion[]>nodeTestDistRc;
@@ -109,28 +221,18 @@ describe('setup-node', () => {
 
     // writes
     cnSpy = jest.spyOn(process.stdout, 'write');
-    logSpy = jest.spyOn(core, 'info');
-    dbgSpy = jest.spyOn(core, 'debug');
-    warningSpy = jest.spyOn(core, 'warning');
-    cnSpy.mockImplementation(line => {
-      // uncomment to debug
-      // process.stderr.write('write:' + line + '\n');
-    });
-    logSpy.mockImplementation(line => {
-      // uncomment to debug
-      // process.stderr.write('log:' + line + '\n');
-    });
-    dbgSpy.mockImplementation(msg => {
-      // uncomment to see debug output
-      // process.stderr.write(msg + '\n');
-    });
-    warningSpy.mockImplementation(msg => {
-      // uncomment to debug
-      // process.stderr.write('log:' + msg + '\n');
-    });
+    logSpy = core.info as jest.Mock;
+    dbgSpy = core.debug as jest.Mock;
+    warningSpy = core.warning as jest.Mock;
+    addPathSpy = core.addPath as jest.Mock;
+    setFailedSpy = core.setFailed as jest.Mock;
+    cnSpy.mockImplementation(() => true);
+    logSpy.mockImplementation(() => {});
+    dbgSpy.mockImplementation(() => {});
+    warningSpy.mockImplementation(() => {});
 
     // @actions/exec
-    getExecOutputSpy = jest.spyOn(exec, 'getExecOutput');
+    getExecOutputSpy = exec.getExecOutput as jest.Mock;
     getExecOutputSpy.mockImplementation(() => 'v16.15.0');
   });
 
@@ -178,7 +280,7 @@ describe('setup-node', () => {
     inputs['node-version'] = '20-v8-canary';
     os['arch'] = 'x64';
 
-    inSpy.mockImplementation(name => inputs[name]);
+    inSpy.mockImplementation((name: any) => inputs[name]);
 
     const toolPath = path.normalize(
       '/cache/node/20.0.0-v8-canary20221103f7e2421e91/x64'
@@ -193,7 +295,7 @@ describe('setup-node', () => {
     await main.run();
 
     const expPath = path.join(toolPath, 'bin');
-    expect(cnSpy).toHaveBeenCalledWith(`::add-path::${expPath}${osm.EOL}`);
+    expect(addPathSpy).toHaveBeenCalledWith(expPath);
   });
 
   it('handles unhandled find error and reports error', async () => {
@@ -213,7 +315,7 @@ describe('setup-node', () => {
 
     await main.run();
 
-    expect(cnSpy).toHaveBeenCalledWith('::error::' + errMsg + osm.EOL);
+    expect(setFailedSpy).toHaveBeenCalledWith(errMsg);
   });
 
   //--------------------------------------------------
@@ -249,7 +351,7 @@ describe('setup-node', () => {
     expect(logSpy).toHaveBeenCalledWith(
       `Attempting to download ${versionSpec}...`
     );
-    expect(cnSpy).toHaveBeenCalledWith(`::add-path::${expPath}${osm.EOL}`);
+    expect(addPathSpy).toHaveBeenCalledWith(expPath);
   });
 
   it('does not find a version that does not exist', async () => {
@@ -268,8 +370,8 @@ describe('setup-node', () => {
     ]);
     await main.run();
 
-    expect(cnSpy).toHaveBeenCalledWith(
-      `::error::Unable to find Node version '${versionSpec}' for platform ${os.platform} and architecture ${os.arch}.${osm.EOL}`
+    expect(setFailedSpy).toHaveBeenCalledWith(
+      `Unable to find Node version '${versionSpec}' for platform ${os.platform} and architecture ${os.arch}.`
     );
   });
 
@@ -295,7 +397,7 @@ describe('setup-node', () => {
     });
     await main.run();
 
-    expect(cnSpy).toHaveBeenCalledWith(`::error::${errMsg}${osm.EOL}`);
+    expect(setFailedSpy).toHaveBeenCalledWith(errMsg);
   });
 
   it('acquires specified architecture of node', async () => {
@@ -319,7 +421,6 @@ describe('setup-node', () => {
         darwin: 'darwin',
         win32: 'win'
       }[os.platform];
-
       inputs['node-version'] = version;
       inputs['architecture'] = arch;
       inputs['token'] = 'faketoken';
@@ -393,9 +494,7 @@ describe('setup-node', () => {
         );
         expect(logSpy).toHaveBeenCalledWith('Extracting ...');
         expect(logSpy).toHaveBeenCalledWith('Adding to the cache ...');
-        expect(cnSpy).toHaveBeenCalledWith(
-          `::add-path::${path.join(toolPath, 'bin')}${osm.EOL}`
-        );
+        expect(addPathSpy).toHaveBeenCalledWith(path.join(toolPath, 'bin'));
       }
     );
 
@@ -428,9 +527,7 @@ describe('setup-node', () => {
         // assert
         expect(findAllVersionsSpy).toHaveBeenCalled();
         expect(logSpy).toHaveBeenCalledWith(`Found in cache @ ${toolPath}`);
-        expect(cnSpy).toHaveBeenCalledWith(
-          `::add-path::${path.join(toolPath, 'bin')}${osm.EOL}`
-        );
+        expect(addPathSpy).toHaveBeenCalledWith(path.join(toolPath, 'bin'));
       }
     );
 
@@ -490,9 +587,7 @@ describe('setup-node', () => {
         );
         expect(logSpy).toHaveBeenCalledWith('Extracting ...');
         expect(logSpy).toHaveBeenCalledWith('Adding to the cache ...');
-        expect(cnSpy).toHaveBeenCalledWith(
-          `::add-path::${path.join(toolPath, 'bin')}${osm.EOL}`
-        );
+        expect(addPathSpy).toHaveBeenCalledWith(path.join(toolPath, 'bin'));
       }
     );
 
@@ -554,9 +649,7 @@ describe('setup-node', () => {
         );
         expect(logSpy).toHaveBeenCalledWith('Extracting ...');
         expect(logSpy).toHaveBeenCalledWith('Adding to the cache ...');
-        expect(cnSpy).toHaveBeenCalledWith(
-          `::add-path::${path.join(toolPath, 'bin')}${osm.EOL}`
-        );
+        expect(addPathSpy).toHaveBeenCalledWith(path.join(toolPath, 'bin'));
       }
     );
   });
@@ -575,13 +668,11 @@ describe('setup-node', () => {
       findAllVersionsSpy.mockImplementation(() => [versionExpected]);
 
       const toolPath = path.normalize(`/cache/node/${versionExpected}/x64`);
-      findSpy.mockImplementation(version => toolPath);
+      findSpy.mockImplementation((version: any) => toolPath);
 
       await main.run();
 
-      expect(cnSpy).toHaveBeenCalledWith(
-        `::add-path::${toolPath}${path.sep}bin${osm.EOL}`
-      );
+      expect(addPathSpy).toHaveBeenCalledWith(`${toolPath}${path.sep}bin`);
 
       expect(dlSpy).not.toHaveBeenCalled();
       expect(exSpy).not.toHaveBeenCalled();

__tests__/main.test.ts

@@ -1,43 +1,125 @@
-import * as core from '@actions/core';
-import * as exec from '@actions/exec';
-import * as tc from '@actions/tool-cache';
-import * as cache from '@actions/cache';
-import * as io from '@actions/io';
-
+import {
+  jest,
+  describe,
+  it,
+  expect,
+  beforeEach,
+  afterEach,
+  afterAll
+} from '@jest/globals';
+import {fileURLToPath} from 'url';
 import fs from 'fs';
 import path from 'path';
 import osm from 'os';
 
-import each from 'jest-each';
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
 
-import * as main from '../src/main';
-import * as util from '../src/util';
-import OfficialBuilds from '../src/distributions/official_builds/official_builds';
+// Mock @actions modules before importing anything that depends on them
+jest.unstable_mockModule('@actions/core', () => ({
+  info: jest.fn(),
+  warning: jest.fn(),
+  debug: jest.fn(),
+  error: jest.fn(),
+  notice: jest.fn(),
+  setFailed: jest.fn(),
+  setOutput: jest.fn(),
+  getInput: jest.fn(),
+  getBooleanInput: jest.fn(),
+  getMultilineInput: jest.fn(),
+  addPath: jest.fn(),
+  exportVariable: jest.fn(),
+  saveState: jest.fn(),
+  getState: jest.fn(),
+  setSecret: jest.fn(),
+  isDebug: jest.fn(() => false),
+  startGroup: jest.fn(),
+  endGroup: jest.fn(),
+  group: jest.fn((_name: string, fn: () => Promise<unknown>) => fn()),
+  toPlatformPath: jest.fn((p: string) => p),
+  toWin32Path: jest.fn((p: string) => p),
+  toPosixPath: jest.fn((p: string) => p)
+}));
+
+jest.unstable_mockModule('@actions/exec', () => ({
+  exec: jest.fn(),
+  getExecOutput: jest.fn()
+}));
+
+jest.unstable_mockModule('@actions/tool-cache', () => ({
+  find: jest.fn(),
+  findAllVersions: jest.fn(),
+  downloadTool: jest.fn(),
+  extractTar: jest.fn(),
+  extractZip: jest.fn(),
+  extractXar: jest.fn(),
+  extract7z: jest.fn(),
+  cacheDir: jest.fn(),
+  cacheFile: jest.fn(),
+  getManifestFromRepo: jest.fn(),
+  findFromManifest: jest.fn()
+}));
+
+jest.unstable_mockModule('@actions/cache', () => ({
+  saveCache: jest.fn(),
+  restoreCache: jest.fn(),
+  isFeatureAvailable: jest.fn()
+}));
+
+jest.unstable_mockModule('@actions/io', () => ({
+  which: jest.fn(),
+  mkdirP: jest.fn(),
+  rmRF: jest.fn(),
+  mv: jest.fn(),
+  cp: jest.fn()
+}));
+
+// Pre-import real util before mocking so we can spread it
+const realUtil = await import('../src/util.js');
+
+jest.unstable_mockModule('../src/util.js', () => ({
+  ...realUtil,
+  getNodeVersionFromFile: jest.fn(realUtil.getNodeVersionFromFile)
+}));
+
+// Dynamic imports after mocking
+const core = await import('@actions/core');
+const exec = await import('@actions/exec');
+const tc = await import('@actions/tool-cache');
+const cache = await import('@actions/cache');
+const io = await import('@actions/io');
+const main = await import('../src/main.js');
+const util = await import('../src/util.js');
+const {default: OfficialBuilds} =
+  await import('../src/distributions/official_builds/official_builds.js');
+
+import each from 'jest-each';
 
 describe('main tests', () => {
   let inputs = {} as any;
   let os = {} as any;
 
-  let infoSpy: jest.SpyInstance;
-  let warningSpy: jest.SpyInstance;
-  let saveStateSpy: jest.SpyInstance;
-  let inSpy: jest.SpyInstance;
-  let setOutputSpy: jest.SpyInstance;
-  let startGroupSpy: jest.SpyInstance;
-  let endGroupSpy: jest.SpyInstance;
+  let infoSpy: jest.Mock;
+  let warningSpy: jest.Mock;
+  let saveStateSpy: jest.Mock;
+  let inSpy: jest.Mock;
+  let setOutputSpy: jest.Mock;
+  let startGroupSpy: jest.Mock;
+  let endGroupSpy: jest.Mock;
 
-  let whichSpy: jest.SpyInstance;
+  let whichSpy: jest.Mock;
 
-  let existsSpy: jest.SpyInstance;
+  let existsSpy: jest.Mock;
 
-  let getExecOutputSpy: jest.SpyInstance;
+  let getExecOutputSpy: jest.Mock;
 
-  let getNodeVersionFromFileSpy: jest.SpyInstance;
-  let cnSpy: jest.SpyInstance;
-  let findSpy: jest.SpyInstance;
-  let isCacheActionAvailable: jest.SpyInstance;
+  let getNodeVersionFromFileSpy: jest.Mock;
+  let cnSpy: jest.SpiedFunction<typeof process.stdout.write>;
+  let findSpy: jest.Mock;
+  let isCacheActionAvailable: jest.Mock;
 
-  let setupNodeJsSpy: jest.SpyInstance;
+  let setupNodeJsSpy: jest.SpiedFunction<
+    typeof OfficialBuilds.prototype.setupNodeJs
+  >;
 
   beforeEach(() => {
     inputs = {};
@@ -48,37 +130,34 @@ describe('main tests', () => {
     process.env['GITHUB_WORKSPACE'] = path.join(__dirname, 'data');
     process.env['GITHUB_PATH'] = ''; // Stub out ENV file functionality so we can verify it writes to standard out
     process.env['GITHUB_OUTPUT'] = ''; // Stub out ENV file functionality so we can verify it writes to standard out
-    infoSpy = jest.spyOn(core, 'info');
+    infoSpy = core.info as jest.Mock;
     infoSpy.mockImplementation(() => {});
-    setOutputSpy = jest.spyOn(core, 'setOutput');
+    setOutputSpy = core.setOutput as jest.Mock;
     setOutputSpy.mockImplementation(() => {});
-    warningSpy = jest.spyOn(core, 'warning');
+    warningSpy = core.warning as jest.Mock;
     warningSpy.mockImplementation(() => {});
-    saveStateSpy = jest.spyOn(core, 'saveState');
+    saveStateSpy = core.saveState as jest.Mock;
     saveStateSpy.mockImplementation(() => {});
-    startGroupSpy = jest.spyOn(core, 'startGroup');
+    startGroupSpy = core.startGroup as jest.Mock;
     startGroupSpy.mockImplementation(() => {});
-    endGroupSpy = jest.spyOn(core, 'endGroup');
+    endGroupSpy = core.endGroup as jest.Mock;
     endGroupSpy.mockImplementation(() => {});
-    inSpy = jest.spyOn(core, 'getInput');
-    inSpy.mockImplementation(name => inputs[name]);
+    inSpy = core.getInput as jest.Mock;
+    inSpy.mockImplementation((name: any) => inputs[name]);
 
-    whichSpy = jest.spyOn(io, 'which');
+    whichSpy = io.which as jest.Mock;
 
-    getExecOutputSpy = jest.spyOn(exec, 'getExecOutput');
+    getExecOutputSpy = exec.getExecOutput as jest.Mock;
 
-    findSpy = jest.spyOn(tc, 'find');
+    findSpy = tc.find as jest.Mock;
 
-    isCacheActionAvailable = jest.spyOn(cache, 'isFeatureAvailable');
+    isCacheActionAvailable = cache.isFeatureAvailable as jest.Mock;
 
     cnSpy = jest.spyOn(process.stdout, 'write');
-    cnSpy.mockImplementation(line => {
-      // uncomment to debug
-      process.stderr.write('write:' + line + '\n');
-    });
+    cnSpy.mockImplementation(() => true);
 
     setupNodeJsSpy = jest.spyOn(OfficialBuilds.prototype, 'setupNodeJs');
-    setupNodeJsSpy.mockImplementation(() => {});
+    setupNodeJsSpy.mockImplementation(async () => {});
   });
 
   afterEach(() => {
@@ -93,6 +172,12 @@ describe('main tests', () => {
   }, 100000);
 
   describe('getNodeVersionFromFile', () => {
+    beforeEach(() => {
+      (util.getNodeVersionFromFile as jest.Mock).mockImplementation(
+        realUtil.getNodeVersionFromFile as any
+      );
+    });
+
     each`
       contents                                                                                   | expected
       ${'12'}                                                                                    | ${'12'}
@@ -112,12 +197,12 @@ describe('main tests', () => {
       ${'{"engines": {"node": "17.0.0"}}'}                                                       | ${'17.0.0'}
       ${'{"devEngines": {"runtime": {"name": "node", "version": "22.0.0"}}}'}                    | ${'22.0.0'}
       ${'{"devEngines": {"runtime": [{"name": "bun"}, {"name": "node", "version": "22.0.0"}]}}'} | ${'22.0.0'}
-    `.it('parses "$contents"', ({contents, expected}) => {
+    `.it('parses "$contents"', ({contents, expected}: any) => {
       const existsSpy = jest.spyOn(fs, 'existsSync');
       existsSpy.mockImplementation(() => true);
 
       const readFileSpy = jest.spyOn(fs, 'readFileSync');
-      readFileSpy.mockImplementation(filePath => {
+      readFileSpy.mockImplementation((filePath: any) => {
         if (
           typeof filePath === 'string' &&
           path.basename(filePath) === 'package.json'
@@ -139,8 +224,10 @@ describe('main tests', () => {
       [{node: '16.0.2', npm: '7.3.3', yarn: '2.22.11'}],
       [{node: '14.0.1', npm: '8.1.0', yarn: '3.2.1'}],
       [{node: '17.0.2', npm: '6.3.3', yarn: ''}]
-    ])('Tools versions %p', async obj => {
-      getExecOutputSpy.mockImplementation(async command => {
+    ])('Tools versions %p', async (obj: any) => {
+      (
+        getExecOutputSpy as jest.Mock<typeof exec.getExecOutput>
+      ).mockImplementation(async (command: string) => {
         if (Reflect.has(obj, command) && !obj[command]) {
           return {
             stdout: '',
@@ -152,14 +239,14 @@ describe('main tests', () => {
         return {stdout: obj[command], stderr: '', exitCode: 0};
       });
 
-      whichSpy.mockImplementation(cmd => {
+      whichSpy.mockImplementation((cmd: any) => {
         return `some/${cmd}/path`;
       });
 
       await util.printEnvDetailsAndSetOutput();
 
       expect(setOutputSpy).toHaveBeenCalledWith('node-version', obj['node']);
-      Object.getOwnPropertyNames(obj).forEach(name => {
+      Object.getOwnPropertyNames(obj).forEach((name: any) => {
         if (!obj[name]) {
           expect(infoSpy).toHaveBeenCalledWith(
             `[warning]${name} does not exist`
@@ -175,11 +262,16 @@ describe('main tests', () => {
       delete inputs['node-version'];
       inputs['node-version-file'] = '.nvmrc';
 
-      getNodeVersionFromFileSpy = jest.spyOn(util, 'getNodeVersionFromFile');
+      getNodeVersionFromFileSpy = util.getNodeVersionFromFile as jest.Mock;
+      getNodeVersionFromFileSpy.mockImplementation(
+        realUtil.getNodeVersionFromFile as any
+      );
     });
 
     afterEach(() => {
-      getNodeVersionFromFileSpy.mockRestore();
+      getNodeVersionFromFileSpy.mockImplementation(
+        realUtil.getNodeVersionFromFile as any
+      );
     });
 
     it('does not read node-version-file if node-version is provided', async () => {
@@ -238,8 +330,8 @@ describe('main tests', () => {
 
       // Assert
       expect(getNodeVersionFromFileSpy).toHaveBeenCalled();
-      expect(cnSpy).toHaveBeenCalledWith(
-        `::error::The specified node version file at: ${versionFilePath} does not exist${osm.EOL}`
+      expect(core.setFailed as jest.Mock).toHaveBeenCalledWith(
+        `The specified node version file at: ${versionFilePath} does not exist`
       );
     });
   });
@@ -249,7 +341,7 @@ describe('main tests', () => {
       inputs['node-version'] = '12';
       inputs['cache'] = 'npm';
 
-      inSpy.mockImplementation(name => inputs[name]);
+      inSpy.mockImplementation((name: any) => inputs[name]);
 
       const toolPath = path.normalize('/cache/node/12.16.1/x64');
       findSpy.mockImplementation(() => toolPath);
@@ -269,7 +361,7 @@ describe('main tests', () => {
       inputs['node-version'] = '12';
       inputs['cache'] = 'npm';
 
-      inSpy.mockImplementation(name => inputs[name]);
+      inSpy.mockImplementation((name: any) => inputs[name]);
 
       const toolPath = path.normalize('/cache/node/12.16.1/x64');
       findSpy.mockImplementation(() => toolPath);
@@ -292,7 +384,7 @@ describe('main tests', () => {
       inputs['cache'] = '';
       isCacheActionAvailable.mockImplementation(() => true);
 
-      inSpy.mockImplementation(name => inputs[name]);
+      inSpy.mockImplementation((name: any) => inputs[name]);
       const readFileSpy = jest.spyOn(fs, 'readFileSync');
       readFileSpy.mockImplementation(() =>
         JSON.stringify({
@@ -310,7 +402,7 @@ describe('main tests', () => {
       inputs['cache'] = '';
       isCacheActionAvailable.mockImplementation(() => true);
 
-      inSpy.mockImplementation(name => inputs[name]);
+      inSpy.mockImplementation((name: any) => inputs[name]);
       const readFileSpy = jest.spyOn(fs, 'readFileSync');
       readFileSpy.mockImplementation(() =>
         JSON.stringify({
@@ -330,7 +422,7 @@ describe('main tests', () => {
       inputs['cache'] = '';
       isCacheActionAvailable.mockImplementation(() => true);
 
-      inSpy.mockImplementation(name => inputs[name]);
+      inSpy.mockImplementation((name: any) => inputs[name]);
       const readFileSpy = jest.spyOn(fs, 'readFileSync');
       readFileSpy.mockImplementation(() =>
         JSON.stringify({
@@ -348,7 +440,7 @@ describe('main tests', () => {
     it('Should not enable caching if packageManager is "pnpm@8.0.0" and cache input is not provided', async () => {
       inputs['package-manager-cache'] = 'true';
       inputs['cache'] = '';
-      inSpy.mockImplementation(name => inputs[name]);
+      inSpy.mockImplementation((name: any) => inputs[name]);
       const readFileSpy = jest.spyOn(fs, 'readFileSync');
       readFileSpy.mockImplementation(() =>
         JSON.stringify({
@@ -364,7 +456,7 @@ describe('main tests', () => {
     it('Should not enable caching if devEngines.packageManager.name is "pnpm"', async () => {
       inputs['package-manager-cache'] = 'true';
       inputs['cache'] = '';
-      inSpy.mockImplementation(name => inputs[name]);
+      inSpy.mockImplementation((name: any) => inputs[name]);
       const readFileSpy = jest.spyOn(fs, 'readFileSync');
       readFileSpy.mockImplementation(() =>
         JSON.stringify({
@@ -382,7 +474,7 @@ describe('main tests', () => {
     it('Should not enable caching if devEngines.packageManager is array without "npm"', async () => {
       inputs['package-manager-cache'] = 'true';
       inputs['cache'] = '';
-      inSpy.mockImplementation(name => inputs[name]);
+      inSpy.mockImplementation((name: any) => inputs[name]);
       const readFileSpy = jest.spyOn(fs, 'readFileSync');
       readFileSpy.mockImplementation(() =>
         JSON.stringify({
@@ -400,7 +492,7 @@ describe('main tests', () => {
     it('Should not enable caching if packageManager field is missing in package.json and cache input is not provided', async () => {
       inputs['package-manager-cache'] = 'true';
       inputs['cache'] = '';
-      inSpy.mockImplementation(name => inputs[name]);
+      inSpy.mockImplementation((name: any) => inputs[name]);
       const readFileSpy = jest.spyOn(fs, 'readFileSync');
       readFileSpy.mockImplementation(() =>
         JSON.stringify({
@@ -416,7 +508,7 @@ describe('main tests', () => {
     it('Should skip caching when package-manager-cache is false', async () => {
       inputs['package-manager-cache'] = 'false';
       inputs['cache'] = '';
-      inSpy.mockImplementation(name => inputs[name]);
+      inSpy.mockImplementation((name: any) => inputs[name]);
       await main.run();
       expect(saveStateSpy).not.toHaveBeenCalled();
     });
@@ -424,7 +516,7 @@ describe('main tests', () => {
     it('Should enable caching with cache input explicitly provided', async () => {
       inputs['package-manager-cache'] = 'true';
       inputs['cache'] = 'npm';
-      inSpy.mockImplementation(name => inputs[name]);
+      inSpy.mockImplementation((name: any) => inputs[name]);
       isCacheActionAvailable.mockImplementation(() => true);
       await main.run();
       expect(saveStateSpy).toHaveBeenCalledWith(expect.anything(), 'npm');

__tests__/mock/glob-mock.test.ts

@@ -1,4 +1,5 @@
-import {MockGlobber} from './glob-mock';
+import {describe, it, expect} from '@jest/globals';
+import {MockGlobber} from './glob-mock.js';
 
 describe('mocked globber tests', () => {
   it('globber should return generator', async () => {

__tests__/nightly-installer.test.ts

@@ -1,51 +1,160 @@
-import * as core from '@actions/core';
-import * as io from '@actions/io';
-import * as tc from '@actions/tool-cache';
-import * as httpm from '@actions/http-client';
-import * as exec from '@actions/exec';
-import * as cache from '@actions/cache';
+import {
+  jest,
+  describe,
+  it,
+  expect,
+  beforeEach,
+  afterEach,
+  afterAll
+} from '@jest/globals';
+import {fileURLToPath} from 'url';
 import fs from 'fs';
 import cp from 'child_process';
 import osm from 'os';
 import path from 'path';
-import * as main from '../src/main';
-import * as auth from '../src/authutil';
-import {INodeVersion} from '../src/distributions/base-models';
 
-import nodeTestManifest from './data/versions-manifest.json';
-import nodeTestDist from './data/node-dist-index.json';
-import nodeTestDistNightly from './data/node-nightly-index.json';
-import nodeTestDistRc from './data/node-rc-index.json';
-import nodeV8CanaryTestDist from './data/v8-canary-dist-index.json';
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+
+// Mock @actions modules before importing anything that depends on them
+jest.unstable_mockModule('@actions/core', () => ({
+  info: jest.fn(),
+  warning: jest.fn(),
+  debug: jest.fn(),
+  error: jest.fn(),
+  notice: jest.fn(),
+  setFailed: jest.fn(),
+  setOutput: jest.fn(),
+  getInput: jest.fn(),
+  getBooleanInput: jest.fn(),
+  getMultilineInput: jest.fn(),
+  addPath: jest.fn(),
+  exportVariable: jest.fn(),
+  saveState: jest.fn(),
+  getState: jest.fn(),
+  setSecret: jest.fn(),
+  isDebug: jest.fn(() => false),
+  startGroup: jest.fn(),
+  endGroup: jest.fn(),
+  group: jest.fn((_name: string, fn: () => Promise<unknown>) => fn()),
+  toPlatformPath: jest.fn((p: string) => p),
+  toWin32Path: jest.fn((p: string) => p),
+  toPosixPath: jest.fn((p: string) => p)
+}));
+
+jest.unstable_mockModule('@actions/io', () => ({
+  which: jest.fn(),
+  mkdirP: jest.fn(),
+  rmRF: jest.fn(),
+  mv: jest.fn(),
+  cp: jest.fn()
+}));
+
+jest.unstable_mockModule('@actions/tool-cache', () => ({
+  find: jest.fn(),
+  findAllVersions: jest.fn(),
+  downloadTool: jest.fn(),
+  extractTar: jest.fn(),
+  extractZip: jest.fn(),
+  extractXar: jest.fn(),
+  extract7z: jest.fn(),
+  cacheDir: jest.fn(),
+  cacheFile: jest.fn(),
+  getManifestFromRepo: jest.fn(),
+  findFromManifest: jest.fn(),
+  HTTPError: class HTTPError extends Error {
+    readonly httpStatusCode: number;
+    constructor(httpStatusCode?: number) {
+      super(`Unexpected HTTP response: ${httpStatusCode}`);
+      this.httpStatusCode = httpStatusCode ?? 0;
+    }
+  }
+}));
+
+const _mockGetJson = jest.fn();
+jest.unstable_mockModule('@actions/http-client', () => ({
+  HttpClient: jest.fn().mockImplementation(() => ({
+    getJson: _mockGetJson
+  }))
+}));
+
+jest.unstable_mockModule('@actions/exec', () => ({
+  exec: jest.fn(),
+  getExecOutput: jest.fn()
+}));
+
+jest.unstable_mockModule('@actions/cache', () => ({
+  saveCache: jest.fn(),
+  restoreCache: jest.fn(),
+  isFeatureAvailable: jest.fn()
+}));
+
+const realAuth = await import('../src/authutil.js');
+jest.unstable_mockModule('../src/authutil.js', () => ({
+  ...realAuth,
+  configAuthentication: jest.fn()
+}));
+
+// Dynamic imports after mocking
+const core = await import('@actions/core');
+const io = await import('@actions/io');
+const tc = await import('@actions/tool-cache');
+const httpm = await import('@actions/http-client');
+const exec = await import('@actions/exec');
+const cache = await import('@actions/cache');
+const main = await import('../src/main.js');
+const auth = await import('../src/authutil.js');
+
+const {default: nodeTestManifest} = await import(
+  './data/versions-manifest.json',
+  {with: {type: 'json'}}
+);
+const {default: nodeTestDist} = await import('./data/node-dist-index.json', {
+  with: {type: 'json'}
+});
+const {default: nodeTestDistNightly} = await import(
+  './data/node-nightly-index.json',
+  {with: {type: 'json'}}
+);
+const {default: nodeTestDistRc} = await import('./data/node-rc-index.json', {
+  with: {type: 'json'}
+});
+const {default: nodeV8CanaryTestDist} = await import(
+  './data/v8-canary-dist-index.json',
+  {with: {type: 'json'}}
+);
+
+import type {INodeVersion} from '../src/distributions/base-models.js';
 
 describe('setup-node', () => {
   let inputs = {} as any;
   let os = {} as any;
 
-  let inSpy: jest.SpyInstance;
-  let findSpy: jest.SpyInstance;
-  let findAllVersionsSpy: jest.SpyInstance;
-  let cnSpy: jest.SpyInstance;
-  let logSpy: jest.SpyInstance;
-  let warningSpy: jest.SpyInstance;
-  let getManifestSpy: jest.SpyInstance;
-  let getDistSpy: jest.SpyInstance;
-  let platSpy: jest.SpyInstance;
-  let archSpy: jest.SpyInstance;
-  let dlSpy: jest.SpyInstance;
-  let exSpy: jest.SpyInstance;
-  let cacheSpy: jest.SpyInstance;
-  let dbgSpy: jest.SpyInstance;
-  let whichSpy: jest.SpyInstance;
-  let existsSpy: jest.SpyInstance;
-  let mkdirpSpy: jest.SpyInstance;
-  let cpSpy: jest.SpyInstance;
-  let execSpy: jest.SpyInstance;
-  let authSpy: jest.SpyInstance;
-  let parseNodeVersionSpy: jest.SpyInstance;
-  let isCacheActionAvailable: jest.SpyInstance;
-  let getExecOutputSpy: jest.SpyInstance;
-  let getJsonSpy: jest.SpyInstance;
+  let inSpy: jest.Mock;
+  let findSpy: jest.Mock;
+  let findAllVersionsSpy: jest.Mock;
+  let cnSpy: jest.SpiedFunction<typeof process.stdout.write>;
+  let logSpy: jest.Mock;
+  let warningSpy: jest.Mock;
+  let addPathSpy: jest.Mock;
+  let setFailedSpy: jest.Mock;
+  let getManifestSpy: jest.Mock;
+  let getDistSpy: jest.Mock;
+  let platSpy: jest.SpiedFunction<typeof osm.platform>;
+  let archSpy: jest.SpiedFunction<typeof osm.arch>;
+  let dlSpy: jest.Mock;
+  let exSpy: jest.Mock;
+  let cacheSpy: jest.Mock;
+  let dbgSpy: jest.Mock;
+  let whichSpy: jest.Mock;
+  let existsSpy: jest.SpiedFunction<typeof fs.existsSync>;
+  let mkdirpSpy: jest.Mock;
+  let cpSpy: jest.Mock;
+  let execSpy: jest.SpiedFunction<typeof cp.execSync>;
+  let authSpy: jest.Mock;
+  let parseNodeVersionSpy: jest.Mock;
+  let isCacheActionAvailable: jest.Mock;
+  let getExecOutputSpy: jest.Mock;
+  let getJsonSpy: jest.Mock;
 
   beforeEach(() => {
     // @actions/core
@@ -54,8 +163,8 @@ describe('setup-node', () => {
     process.env['GITHUB_OUTPUT'] = ''; // Stub out ENV file functionality so we can verify it writes to standard out
     process.env['RUNNER_TEMP'] = '/runner_temp';
     inputs = {};
-    inSpy = jest.spyOn(core, 'getInput');
-    inSpy.mockImplementation(name => inputs[name]);
+    inSpy = core.getInput as jest.Mock;
+    inSpy.mockImplementation((name: any) => inputs[name]);
 
     // node
     os = {};
@@ -66,30 +175,33 @@ describe('setup-node', () => {
     execSpy = jest.spyOn(cp, 'execSync');
 
     // @actions/tool-cache
-    findSpy = jest.spyOn(tc, 'find');
-    findAllVersionsSpy = jest.spyOn(tc, 'findAllVersions');
-    dlSpy = jest.spyOn(tc, 'downloadTool');
-    exSpy = jest.spyOn(tc, 'extractTar');
-    cacheSpy = jest.spyOn(tc, 'cacheDir');
-    getManifestSpy = jest.spyOn(tc, 'getManifestFromRepo');
+    findSpy = tc.find as jest.Mock;
+    findAllVersionsSpy = tc.findAllVersions as jest.Mock;
+    dlSpy = tc.downloadTool as jest.Mock;
+    exSpy = tc.extractTar as jest.Mock;
+    cacheSpy = tc.cacheDir as jest.Mock;
+    getManifestSpy = tc.getManifestFromRepo as jest.Mock;
 
     // http-client
-    getJsonSpy = jest.spyOn(httpm.HttpClient.prototype, 'getJson');
+    getJsonSpy = _mockGetJson;
+    (httpm.HttpClient as jest.Mock).mockImplementation(() => ({
+      getJson: _mockGetJson
+    }));
 
     // io
-    whichSpy = jest.spyOn(io, 'which');
+    whichSpy = io.which as jest.Mock;
     existsSpy = jest.spyOn(fs, 'existsSync');
-    mkdirpSpy = jest.spyOn(io, 'mkdirP');
-    cpSpy = jest.spyOn(io, 'cp');
+    mkdirpSpy = io.mkdirP as jest.Mock;
+    cpSpy = io.cp as jest.Mock;
 
     // @actions/tool-cache
-    isCacheActionAvailable = jest.spyOn(cache, 'isFeatureAvailable');
+    isCacheActionAvailable = cache.isFeatureAvailable as jest.Mock;
 
     // disable authentication portion for installer tests
-    authSpy = jest.spyOn(auth, 'configAuthentication');
+    authSpy = auth.configAuthentication as jest.Mock;
     authSpy.mockImplementation(() => {});
 
-    getJsonSpy.mockImplementation(url => {
+    getJsonSpy.mockImplementation((url: any) => {
       let res: any;
       if (url.includes('/rc')) {
         res = <INodeVersion[]>nodeTestDistRc;
@@ -106,28 +218,18 @@ describe('setup-node', () => {
 
     // writes
     cnSpy = jest.spyOn(process.stdout, 'write');
-    logSpy = jest.spyOn(core, 'info');
-    dbgSpy = jest.spyOn(core, 'debug');
-    warningSpy = jest.spyOn(core, 'warning');
-    cnSpy.mockImplementation(line => {
-      // uncomment to debug
-      // process.stderr.write('write:' + line + '\n');
-    });
-    logSpy.mockImplementation(line => {
-      // uncomment to debug
-      // process.stderr.write('log:' + line + '\n');
-    });
-    dbgSpy.mockImplementation(msg => {
-      // uncomment to see debug output
-      // process.stderr.write(msg + '\n');
-    });
-    warningSpy.mockImplementation(msg => {
-      // uncomment to debug
-      // process.stderr.write('log:' + msg + '\n');
-    });
+    logSpy = core.info as jest.Mock;
+    dbgSpy = core.debug as jest.Mock;
+    warningSpy = core.warning as jest.Mock;
+    addPathSpy = core.addPath as jest.Mock;
+    setFailedSpy = core.setFailed as jest.Mock;
+    cnSpy.mockImplementation(() => true);
+    logSpy.mockImplementation(() => {});
+    dbgSpy.mockImplementation(() => {});
+    warningSpy.mockImplementation(() => {});
 
     // @actions/exec
-    getExecOutputSpy = jest.spyOn(exec, 'getExecOutput');
+    getExecOutputSpy = exec.getExecOutput as jest.Mock;
     getExecOutputSpy.mockImplementation(() => 'v16.15.0');
   });
 
@@ -202,7 +304,7 @@ describe('setup-node', () => {
     inputs['node-version'] = '16-nightly';
     os['arch'] = 'x64';
 
-    inSpy.mockImplementation(name => inputs[name]);
+    inSpy.mockImplementation((name: any) => inputs[name]);
 
     const toolPath = path.normalize(
       '/cache/node/16.0.0-nightly20210417bc31dc0e0f/x64'
@@ -224,7 +326,7 @@ describe('setup-node', () => {
     );
 
     const expPath = path.join(toolPath, 'bin');
-    expect(cnSpy).toHaveBeenCalledWith(`::add-path::${expPath}${osm.EOL}`);
+    expect(addPathSpy).toHaveBeenCalledWith(expPath);
   });
 
   it('handles unhandled find error and reports error', async () => {
@@ -244,7 +346,7 @@ describe('setup-node', () => {
 
     await main.run();
 
-    expect(cnSpy).toHaveBeenCalledWith('::error::' + errMsg + osm.EOL);
+    expect(setFailedSpy).toHaveBeenCalledWith(errMsg);
   });
 
   it('falls back to a version from node dist', async () => {
@@ -274,7 +376,7 @@ describe('setup-node', () => {
 
     expect(dlSpy).toHaveBeenCalled();
     expect(exSpy).toHaveBeenCalled();
-    expect(cnSpy).toHaveBeenCalledWith(`::add-path::${expPath}${osm.EOL}`);
+    expect(addPathSpy).toHaveBeenCalledWith(expPath);
   });
 
   it('windows: falls back to exe version if not in manifest and not in node dist', async () => {
@@ -296,8 +398,8 @@ describe('setup-node', () => {
     findSpy.mockImplementation(() => '');
     findAllVersionsSpy.mockImplementation(() => []);
 
-    dlSpy.mockImplementation(async url => {
-      if (workingUrls.includes(url)) {
+    dlSpy.mockImplementation(async (url: any) => {
+      if (workingUrls.includes(url as string)) {
         return '/some/temp/path';
       }
 
@@ -312,10 +414,10 @@ describe('setup-node', () => {
 
     await main.run();
 
-    workingUrls.forEach(url => {
+    workingUrls.forEach((url: any) => {
       expect(dlSpy).toHaveBeenCalledWith(url, undefined, undefined);
     });
-    expect(cnSpy).toHaveBeenCalledWith(`::add-path::${toolPath}${osm.EOL}`);
+    expect(addPathSpy).toHaveBeenCalledWith(toolPath);
   });
 
   it('linux: does not fall back to exe version if not in manifest and not in node dist', async () => {
@@ -337,8 +439,8 @@ describe('setup-node', () => {
     findSpy.mockImplementation(() => '');
     findAllVersionsSpy.mockImplementation(() => []);
 
-    dlSpy.mockImplementation(async url => {
-      if (workingUrls.includes(url)) {
+    dlSpy.mockImplementation(async (url: any) => {
+      if (workingUrls.includes(url as string)) {
         return '/some/temp/path';
       }
 
@@ -353,12 +455,10 @@ describe('setup-node', () => {
 
     await main.run();
 
-    workingUrls.forEach(url => {
+    workingUrls.forEach((url: any) => {
       expect(dlSpy).not.toHaveBeenCalledWith(url);
     });
-    expect(cnSpy).toHaveBeenCalledWith(
-      `::error::Unexpected HTTP response: 404${osm.EOL}`
-    );
+    expect(setFailedSpy).toHaveBeenCalledWith('Unexpected HTTP response: 404');
   });
 
   it('does not find a version that does not exist', async () => {
@@ -372,8 +472,8 @@ describe('setup-node', () => {
     findAllVersionsSpy.mockImplementation(() => []);
     await main.run();
 
-    expect(cnSpy).toHaveBeenCalledWith(
-      `::error::Unable to find Node version '${versionSpec}' for platform ${os.platform} and architecture ${os.arch}.${osm.EOL}`
+    expect(setFailedSpy).toHaveBeenCalledWith(
+      `Unable to find Node version '${versionSpec}' for platform ${os.platform} and architecture ${os.arch}.`
     );
   });
 
@@ -396,7 +496,7 @@ describe('setup-node', () => {
     });
     await main.run();
 
-    expect(cnSpy).toHaveBeenCalledWith(`::error::${errMsg}${osm.EOL}`);
+    expect(setFailedSpy).toHaveBeenCalledWith(errMsg);
   });
 
   it('acquires specified architecture of node', async () => {
@@ -420,7 +520,6 @@ describe('setup-node', () => {
         darwin: 'darwin',
         win32: 'win'
       }[os.platform];
-
       inputs['node-version'] = version;
       inputs['architecture'] = arch;
       inputs['token'] = 'faketoken';
@@ -465,7 +564,6 @@ describe('setup-node', () => {
         darwin: 'darwin',
         win32: 'win'
       }[os.platform];
-
       inputs['node-version'] = version;
       inputs['architecture'] = arch;
       inputs['token'] = 'faketoken';
@@ -541,9 +639,7 @@ describe('setup-node', () => {
         );
         expect(logSpy).toHaveBeenCalledWith('Extracting ...');
         expect(logSpy).toHaveBeenCalledWith('Adding to the cache ...');
-        expect(cnSpy).toHaveBeenCalledWith(
-          `::add-path::${path.join(toolPath, 'bin')}${osm.EOL}`
-        );
+        expect(addPathSpy).toHaveBeenCalledWith(path.join(toolPath, 'bin'));
       }
     );
 
@@ -573,9 +669,7 @@ describe('setup-node', () => {
         // assert
         expect(findAllVersionsSpy).toHaveBeenCalled();
         expect(logSpy).toHaveBeenCalledWith(`Found in cache @ ${toolPath}`);
-        expect(cnSpy).toHaveBeenCalledWith(
-          `::add-path::${path.join(toolPath, 'bin')}${osm.EOL}`
-        );
+        expect(addPathSpy).toHaveBeenCalledWith(path.join(toolPath, 'bin'));
       }
     );
 
@@ -641,9 +735,7 @@ describe('setup-node', () => {
         );
         expect(logSpy).toHaveBeenCalledWith('Extracting ...');
         expect(logSpy).toHaveBeenCalledWith('Adding to the cache ...');
-        expect(cnSpy).toHaveBeenCalledWith(
-          `::add-path::${path.join(toolPath, 'bin')}${osm.EOL}`
-        );
+        expect(addPathSpy).toHaveBeenCalledWith(path.join(toolPath, 'bin'));
       }
     );
   });

__tests__/official-installer.test.ts

@@ -1,51 +1,163 @@
-import * as core from '@actions/core';
-import * as io from '@actions/io';
-import * as tc from '@actions/tool-cache';
-import * as httpm from '@actions/http-client';
-import * as exec from '@actions/exec';
-import * as cache from '@actions/cache';
+import {
+  jest,
+  describe,
+  it,
+  expect,
+  beforeEach,
+  afterEach,
+  afterAll
+} from '@jest/globals';
+import {fileURLToPath} from 'url';
 import fs from 'fs';
 import cp from 'child_process';
 import osm from 'os';
 import path from 'path';
-import * as main from '../src/main';
-import * as auth from '../src/authutil';
-import OfficialBuilds from '../src/distributions/official_builds/official_builds';
-import {INodeVersion} from '../src/distributions/base-models';
 
-import nodeTestManifest from './data/versions-manifest.json';
-import nodeTestDist from './data/node-dist-index.json';
-import nodeTestDistNightly from './data/node-nightly-index.json';
-import nodeTestDistRc from './data/node-rc-index.json';
-import nodeV8CanaryTestDist from './data/v8-canary-dist-index.json';
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+
+// Mock @actions modules before importing anything that depends on them
+jest.unstable_mockModule('@actions/core', () => ({
+  info: jest.fn(),
+  warning: jest.fn(),
+  debug: jest.fn(),
+  error: jest.fn(),
+  notice: jest.fn(),
+  setFailed: jest.fn(),
+  setOutput: jest.fn(),
+  getInput: jest.fn(),
+  getBooleanInput: jest.fn(),
+  getMultilineInput: jest.fn(),
+  addPath: jest.fn(),
+  exportVariable: jest.fn(),
+  saveState: jest.fn(),
+  getState: jest.fn(),
+  setSecret: jest.fn(),
+  isDebug: jest.fn(() => false),
+  startGroup: jest.fn(),
+  endGroup: jest.fn(),
+  group: jest.fn((_name: string, fn: () => Promise<unknown>) => fn()),
+  toPlatformPath: jest.fn((p: string) => p),
+  toWin32Path: jest.fn((p: string) => p),
+  toPosixPath: jest.fn((p: string) => p)
+}));
+
+jest.unstable_mockModule('@actions/io', () => ({
+  which: jest.fn(),
+  mkdirP: jest.fn(),
+  rmRF: jest.fn(),
+  mv: jest.fn(),
+  cp: jest.fn()
+}));
+
+jest.unstable_mockModule('@actions/tool-cache', () => ({
+  find: jest.fn(),
+  findAllVersions: jest.fn(),
+  downloadTool: jest.fn(),
+  extractTar: jest.fn(),
+  extractZip: jest.fn(),
+  extractXar: jest.fn(),
+  extract7z: jest.fn(),
+  cacheDir: jest.fn(),
+  cacheFile: jest.fn(),
+  getManifestFromRepo: jest.fn(),
+  findFromManifest: jest.fn(),
+  HTTPError: class HTTPError extends Error {
+    readonly httpStatusCode: number;
+    constructor(httpStatusCode?: number) {
+      super(`Unexpected HTTP response: ${httpStatusCode}`);
+      this.httpStatusCode = httpStatusCode ?? 0;
+    }
+  }
+}));
+
+const _mockGetJson = jest.fn();
+jest.unstable_mockModule('@actions/http-client', () => ({
+  HttpClient: jest.fn().mockImplementation(() => ({
+    getJson: _mockGetJson
+  }))
+}));
+
+jest.unstable_mockModule('@actions/exec', () => ({
+  exec: jest.fn(),
+  getExecOutput: jest.fn()
+}));
+
+jest.unstable_mockModule('@actions/cache', () => ({
+  saveCache: jest.fn(),
+  restoreCache: jest.fn(),
+  isFeatureAvailable: jest.fn()
+}));
+
+// Pre-import real authutil before mocking
+const realAuth = await import('../src/authutil.js');
+jest.unstable_mockModule('../src/authutil.js', () => ({
+  ...realAuth,
+  configAuthentication: jest.fn()
+}));
+
+// Dynamic imports after mocking
+const core = await import('@actions/core');
+const io = await import('@actions/io');
+const tc = await import('@actions/tool-cache');
+const httpm = await import('@actions/http-client');
+const exec = await import('@actions/exec');
+const cache = await import('@actions/cache');
+const main = await import('../src/main.js');
+const auth = await import('../src/authutil.js');
+const {default: OfficialBuilds} =
+  await import('../src/distributions/official_builds/official_builds.js');
+
+const {default: nodeTestManifest} = await import(
+  './data/versions-manifest.json',
+  {with: {type: 'json'}}
+);
+const {default: nodeTestDist} = await import('./data/node-dist-index.json', {
+  with: {type: 'json'}
+});
+const {default: nodeTestDistNightly} = await import(
+  './data/node-nightly-index.json',
+  {with: {type: 'json'}}
+);
+const {default: nodeTestDistRc} = await import('./data/node-rc-index.json', {
+  with: {type: 'json'}
+});
+const {default: nodeV8CanaryTestDist} = await import(
+  './data/v8-canary-dist-index.json',
+  {with: {type: 'json'}}
+);
+
+import type {INodeVersion} from '../src/distributions/base-models.js';
+import type {IToolRelease} from '@actions/tool-cache';
 
 describe('setup-node', () => {
-  let build: OfficialBuilds;
+  let build: InstanceType<typeof OfficialBuilds>;
   let inputs = {} as any;
   let os = {} as any;
 
-  let inSpy: jest.SpyInstance;
-  let findSpy: jest.SpyInstance;
-  let findAllVersionsSpy: jest.SpyInstance;
-  let cnSpy: jest.SpyInstance;
-  let logSpy: jest.SpyInstance;
-  let warningSpy: jest.SpyInstance;
-  let getManifestSpy: jest.SpyInstance;
-  let platSpy: jest.SpyInstance;
-  let archSpy: jest.SpyInstance;
-  let dlSpy: jest.SpyInstance;
-  let exSpy: jest.SpyInstance;
-  let cacheSpy: jest.SpyInstance;
-  let dbgSpy: jest.SpyInstance;
-  let whichSpy: jest.SpyInstance;
-  let existsSpy: jest.SpyInstance;
-  let readFileSyncSpy: jest.SpyInstance;
-  let mkdirpSpy: jest.SpyInstance;
-  let execSpy: jest.SpyInstance;
-  let authSpy: jest.SpyInstance;
-  let isCacheActionAvailable: jest.SpyInstance;
-  let getExecOutputSpy: jest.SpyInstance;
-  let getJsonSpy: jest.SpyInstance;
+  let inSpy: jest.Mock;
+  let findSpy: jest.Mock;
+  let findAllVersionsSpy: jest.Mock;
+  let cnSpy: jest.SpiedFunction<typeof process.stdout.write>;
+  let logSpy: jest.Mock;
+  let warningSpy: jest.Mock;
+  let addPathSpy: jest.Mock;
+  let setFailedSpy: jest.Mock;
+  let getManifestSpy: jest.Mock;
+  let platSpy: jest.SpiedFunction<typeof osm.platform>;
+  let archSpy: jest.SpiedFunction<typeof osm.arch>;
+  let dlSpy: jest.Mock;
+  let exSpy: jest.Mock;
+  let cacheSpy: jest.Mock;
+  let dbgSpy: jest.Mock;
+  let whichSpy: jest.Mock;
+  let existsSpy: jest.SpiedFunction<typeof fs.existsSync>;
+  let readFileSyncSpy: jest.Mock;
+  let mkdirpSpy: jest.Mock;
+  let execSpy: jest.SpiedFunction<typeof cp.execSync>;
+  let authSpy: jest.Mock;
+  let isCacheActionAvailable: jest.Mock;
+  let getExecOutputSpy: jest.Mock;
+  let getJsonSpy: jest.Mock;
 
   beforeEach(() => {
     // @actions/core
@@ -53,8 +165,8 @@ describe('setup-node', () => {
     process.env['GITHUB_PATH'] = ''; // Stub out ENV file functionality so we can verify it writes to standard out
     process.env['GITHUB_OUTPUT'] = ''; // Stub out ENV file functionality so we can verify it writes to standard out
     inputs = {};
-    inSpy = jest.spyOn(core, 'getInput');
-    inSpy.mockImplementation(name => inputs[name]);
+    inSpy = core.getInput as jest.Mock;
+    inSpy.mockImplementation((name: any) => inputs[name]);
 
     // node
     os = {};
@@ -65,34 +177,61 @@ describe('setup-node', () => {
     execSpy = jest.spyOn(cp, 'execSync');
 
     // @actions/tool-cache
-    findSpy = jest.spyOn(tc, 'find');
-    findAllVersionsSpy = jest.spyOn(tc, 'findAllVersions');
-    dlSpy = jest.spyOn(tc, 'downloadTool');
-    exSpy = jest.spyOn(tc, 'extractTar');
-    cacheSpy = jest.spyOn(tc, 'cacheDir');
-    getManifestSpy = jest.spyOn(tc, 'getManifestFromRepo');
+    findSpy = tc.find as jest.Mock;
+    findAllVersionsSpy = tc.findAllVersions as jest.Mock;
+    dlSpy = tc.downloadTool as jest.Mock;
+    exSpy = tc.extractTar as jest.Mock;
+    cacheSpy = tc.cacheDir as jest.Mock;
+    getManifestSpy = tc.getManifestFromRepo as jest.Mock;
+
+    // Restore findFromManifest after clearMocks.
+    // In ESM, the real tc.findFromManifest uses os.platform() from its own
+    // module namespace, which jest.spyOn on our os import cannot override.
+    // So we provide a minimal reimplementation that uses the test's os var.
+    (tc.findFromManifest as jest.Mock).mockImplementation(
+      async (versionSpec: any, stable: any, manifest: any, archFilter: any) => {
+        const arch = archFilter || os['arch'] || 'x64';
+        const plat = os['platform'] || process.platform;
+        const semverModule = await import('semver');
+        for (const rel of manifest || []) {
+          if (
+            semverModule.default.satisfies(rel.version, versionSpec, {
+              includePrerelease: true
+            }) &&
+            rel.stable === stable
+          ) {
+            const file = rel.files.find(
+              (f: any) => f.arch === arch && f.platform === plat
+            );
+            if (file) return {...rel, files: [file]};
+          }
+        }
+        return undefined;
+      }
+    );
 
     // http-client
-    getJsonSpy = jest.spyOn(httpm.HttpClient.prototype, 'getJson');
+    getJsonSpy = _mockGetJson;
+    (httpm.HttpClient as jest.Mock).mockImplementation(() => ({
+      getJson: _mockGetJson
+    }));
 
     // io
-    whichSpy = jest.spyOn(io, 'which');
+    whichSpy = io.which as jest.Mock;
     existsSpy = jest.spyOn(fs, 'existsSync');
-    mkdirpSpy = jest.spyOn(io, 'mkdirP');
+    mkdirpSpy = io.mkdirP as jest.Mock;
 
     // @actions/tool-cache
-    isCacheActionAvailable = jest.spyOn(cache, 'isFeatureAvailable');
+    isCacheActionAvailable = cache.isFeatureAvailable as jest.Mock;
 
     // disable authentication portion for installer tests
-    authSpy = jest.spyOn(auth, 'configAuthentication');
+    authSpy = auth.configAuthentication as jest.Mock;
     authSpy.mockImplementation(() => {});
 
     // gets
-    getManifestSpy.mockImplementation(
-      () => <tc.IToolRelease[]>nodeTestManifest
-    );
+    getManifestSpy.mockImplementation(() => <IToolRelease[]>nodeTestManifest);
 
-    getJsonSpy.mockImplementation(url => {
+    getJsonSpy.mockImplementation((url: any) => {
       let res: any;
       if (url.includes('/rc')) {
         res = <INodeVersion[]>nodeTestDistRc;
@@ -107,28 +246,18 @@ describe('setup-node', () => {
 
     // writes
     cnSpy = jest.spyOn(process.stdout, 'write');
-    logSpy = jest.spyOn(core, 'info');
-    dbgSpy = jest.spyOn(core, 'debug');
-    warningSpy = jest.spyOn(core, 'warning');
-    cnSpy.mockImplementation(line => {
-      // uncomment to debug
-      process.stderr.write('write:' + line + '\n');
-    });
-    logSpy.mockImplementation(line => {
-      //   uncomment to debug
-      process.stderr.write('log:' + line + '\n');
-    });
-    dbgSpy.mockImplementation(msg => {
-      // uncomment to see debug output
-      // process.stderr.write(msg + '\n');
-    });
-    warningSpy.mockImplementation(msg => {
-      // uncomment to debug
-      // process.stderr.write('log:' + msg + '\n');
-    });
+    logSpy = core.info as jest.Mock;
+    dbgSpy = core.debug as jest.Mock;
+    warningSpy = core.warning as jest.Mock;
+    addPathSpy = core.addPath as jest.Mock;
+    setFailedSpy = core.setFailed as jest.Mock;
+    cnSpy.mockImplementation(() => true);
+    logSpy.mockImplementation(() => {});
+    dbgSpy.mockImplementation(() => {});
+    warningSpy.mockImplementation(() => {});
 
     // @actions/exec
-    getExecOutputSpy = jest.spyOn(exec, 'getExecOutput');
+    getExecOutputSpy = exec.getExecOutput as jest.Mock;
     getExecOutputSpy.mockImplementation(() => 'v16.15.0');
   });
 
@@ -156,7 +285,7 @@ describe('setup-node', () => {
     async (versionSpec, platform, expectedVersion, expectedLts) => {
       os.platform = platform;
       os.arch = 'x64';
-      const versions: tc.IToolRelease[] | null = await tc.getManifestFromRepo(
+      const versions: IToolRelease[] | null = await tc.getManifestFromRepo(
         'actions',
         'node-versions',
         'mocktoken'
@@ -187,7 +316,7 @@ describe('setup-node', () => {
   it('finds version in cache with stable not supplied', async () => {
     inputs['node-version'] = '12';
 
-    inSpy.mockImplementation(name => inputs[name]);
+    inSpy.mockImplementation((name: any) => inputs[name]);
 
     const toolPath = path.normalize('/cache/node/12.16.1/x64');
     findSpy.mockImplementation(() => toolPath);
@@ -199,14 +328,14 @@ describe('setup-node', () => {
   it('finds version in cache and adds it to the path', async () => {
     inputs['node-version'] = '12';
 
-    inSpy.mockImplementation(name => inputs[name]);
+    inSpy.mockImplementation((name: any) => inputs[name]);
 
     const toolPath = path.normalize('/cache/node/12.16.1/x64');
     findSpy.mockImplementation(() => toolPath);
     await main.run();
 
     const expPath = path.join(toolPath, 'bin');
-    expect(cnSpy).toHaveBeenCalledWith(`::add-path::${expPath}${osm.EOL}`);
+    expect(addPathSpy).toHaveBeenCalledWith(expPath);
   });
 
   it('handles unhandled find error and reports error', async () => {
@@ -219,7 +348,7 @@ describe('setup-node', () => {
 
     await main.run();
 
-    expect(cnSpy).toHaveBeenCalledWith('::error::' + errMsg + osm.EOL);
+    expect(setFailedSpy).toHaveBeenCalledWith(errMsg);
   });
 
   //--------------------------------------------------
@@ -247,7 +376,7 @@ describe('setup-node', () => {
     const toolPath = path.normalize('/cache/node/12.16.2/x64');
     exSpy.mockImplementation(async () => '/some/other/temp/path');
     cacheSpy.mockImplementation(async () => toolPath);
-    whichSpy.mockImplementation(cmd => {
+    whichSpy.mockImplementation((cmd: any) => {
       return `some/${cmd}/path`;
     });
 
@@ -278,7 +407,7 @@ describe('setup-node', () => {
     expect(logSpy).toHaveBeenCalledWith(
       `Attempting to download ${versionSpec}...`
     );
-    expect(cnSpy).toHaveBeenCalledWith(`::add-path::${expPath}${osm.EOL}`);
+    expect(addPathSpy).toHaveBeenCalledWith(expPath);
   });
 
   it('falls back to a version from node dist from mirror', async () => {
@@ -314,7 +443,7 @@ describe('setup-node', () => {
     );
     expect(dlSpy).toHaveBeenCalled();
     expect(exSpy).toHaveBeenCalled();
-    expect(cnSpy).toHaveBeenCalledWith(`::add-path::${expPath}${osm.EOL}`);
+    expect(addPathSpy).toHaveBeenCalledWith(expPath);
   });
 
   it('falls back to a version from node dist', async () => {
@@ -348,7 +477,7 @@ describe('setup-node', () => {
     );
     expect(dlSpy).toHaveBeenCalled();
     expect(exSpy).toHaveBeenCalled();
-    expect(cnSpy).toHaveBeenCalledWith(`::add-path::${expPath}${osm.EOL}`);
+    expect(addPathSpy).toHaveBeenCalledWith(expPath);
   });
 
   it('does not find a version that does not exist', async () => {
@@ -367,8 +496,8 @@ describe('setup-node', () => {
     expect(logSpy).toHaveBeenCalledWith(
       `Attempting to download ${versionSpec}...`
     );
-    expect(cnSpy).toHaveBeenCalledWith(
-      `::error::Unable to find Node version '${versionSpec}' for platform ${os.platform} and architecture ${os.arch}.${osm.EOL}`
+    expect(setFailedSpy).toHaveBeenCalledWith(
+      `Unable to find Node version '${versionSpec}' for platform ${os.platform} and architecture ${os.arch}.`
     );
   });
 
@@ -390,7 +519,7 @@ describe('setup-node', () => {
     });
     await main.run();
 
-    expect(cnSpy).toHaveBeenCalledWith(`::error::${errMsg}${osm.EOL}`);
+    expect(setFailedSpy).toHaveBeenCalledWith(errMsg);
   });
 
   it('reports when download failed but version exists', async () => {
@@ -583,7 +712,7 @@ describe('setup-node', () => {
       expect(logSpy).toHaveBeenCalledWith(
         `Attempting to download ${versionSpec}...`
       );
-      expect(cnSpy).toHaveBeenCalledWith(`::add-path::${expPath}${osm.EOL}`);
+      expect(addPathSpy).toHaveBeenCalledWith(expPath);
     });
 
     it('fallback to dist if manifest is not available', async () => {
@@ -626,7 +755,7 @@ describe('setup-node', () => {
       expect(logSpy).toHaveBeenCalledWith(
         `Attempting to download ${versionSpec}...`
       );
-      expect(cnSpy).toHaveBeenCalledWith(`::add-path::${expPath}${osm.EOL}`);
+      expect(addPathSpy).toHaveBeenCalledWith(expPath);
     });
   });
 
@@ -668,9 +797,7 @@ describe('setup-node', () => {
           `Found LTS release '${expectedVersion}' for Node version 'lts/${lts}'`
         );
         expect(logSpy).toHaveBeenCalledWith(`Found in cache @ ${toolPath}`);
-        expect(cnSpy).toHaveBeenCalledWith(
-          `::add-path::${path.join(toolPath, 'bin')}${osm.EOL}`
-        );
+        expect(addPathSpy).toHaveBeenCalledWith(path.join(toolPath, 'bin'));
       }
     );
 
@@ -728,9 +855,7 @@ describe('setup-node', () => {
         );
         expect(logSpy).toHaveBeenCalledWith('Extracting ...');
         expect(logSpy).toHaveBeenCalledWith('Adding to the cache ...');
-        expect(cnSpy).toHaveBeenCalledWith(
-          `::add-path::${path.join(toolPath, 'bin')}${osm.EOL}`
-        );
+        expect(addPathSpy).toHaveBeenCalledWith(path.join(toolPath, 'bin'));
       }
     );
 
@@ -750,8 +875,8 @@ describe('setup-node', () => {
       expect(dbgSpy).toHaveBeenCalledWith(
         'Getting manifest from actions/node-versions@main'
       );
-      expect(cnSpy).toHaveBeenCalledWith(
-        `::error::Unable to parse LTS alias for Node version 'lts/'${osm.EOL}`
+      expect(setFailedSpy).toHaveBeenCalledWith(
+        `Unable to parse LTS alias for Node version 'lts/'`
       );
     });
 
@@ -774,8 +899,8 @@ describe('setup-node', () => {
       expect(dbgSpy).toHaveBeenCalledWith(
         `LTS alias 'unknown' for Node version 'lts/unknown'`
       );
-      expect(cnSpy).toHaveBeenCalledWith(
-        `::error::Unable to find LTS release 'unknown' for Node version 'lts/unknown'.${osm.EOL}`
+      expect(setFailedSpy).toHaveBeenCalledWith(
+        `Unable to find LTS release 'unknown' for Node version 'lts/unknown'.`
       );
     });
 
@@ -799,9 +924,7 @@ describe('setup-node', () => {
       expect(dbgSpy).toHaveBeenCalledWith(
         'Getting manifest from actions/node-versions@main'
       );
-      expect(cnSpy).toHaveBeenCalledWith(
-        `::error::Unable to download manifest${osm.EOL}`
-      );
+      expect(setFailedSpy).toHaveBeenCalledWith('Unable to download manifest');
     });
   });
 
@@ -871,7 +994,6 @@ describe('setup-node', () => {
         darwin: 'darwin',
         win32: 'win'
       }[os.platform];
-
       inputs['node-version'] = version;
       inputs['architecture'] = arch;
       inputs['token'] = 'faketoken';

__tests__/problem-matcher.test.ts

@@ -1,4 +1,5 @@
-import tscMatcher from '../.github/tsc.json';
+import {describe, it, expect} from '@jest/globals';
+import tscMatcher from '../.github/tsc.json' with {type: 'json'};
 
 describe('problem matcher tests', () => {
   it('tsc: matches TypeScript "pretty" error message', () => {

__tests__/rc-installer.test.ts

@@ -1,46 +1,152 @@
-import * as core from '@actions/core';
-import * as io from '@actions/io';
-import * as tc from '@actions/tool-cache';
-import * as httpm from '@actions/http-client';
-import * as exec from '@actions/exec';
-import * as cache from '@actions/cache';
+import {
+  jest,
+  describe,
+  it,
+  expect,
+  beforeEach,
+  afterEach,
+  afterAll
+} from '@jest/globals';
+import {fileURLToPath} from 'url';
 import fs from 'fs';
 import cp from 'child_process';
 import osm from 'os';
 import path from 'path';
-import * as main from '../src/main';
-import * as auth from '../src/authutil';
-import {INodeVersion} from '../src/distributions/base-models';
 
-import nodeTestDist from './data/node-dist-index.json';
-import nodeTestDistNightly from './data/node-nightly-index.json';
-import nodeTestDistRc from './data/node-rc-index.json';
-import nodeV8CanaryTestDist from './data/v8-canary-dist-index.json';
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+
+// Mock @actions modules before importing anything that depends on them
+jest.unstable_mockModule('@actions/core', () => ({
+  info: jest.fn(),
+  warning: jest.fn(),
+  debug: jest.fn(),
+  error: jest.fn(),
+  notice: jest.fn(),
+  setFailed: jest.fn(),
+  setOutput: jest.fn(),
+  getInput: jest.fn(),
+  getBooleanInput: jest.fn(),
+  getMultilineInput: jest.fn(),
+  addPath: jest.fn(),
+  exportVariable: jest.fn(),
+  saveState: jest.fn(),
+  getState: jest.fn(),
+  setSecret: jest.fn(),
+  isDebug: jest.fn(() => false),
+  startGroup: jest.fn(),
+  endGroup: jest.fn(),
+  group: jest.fn((_name: string, fn: () => Promise<unknown>) => fn()),
+  toPlatformPath: jest.fn((p: string) => p),
+  toWin32Path: jest.fn((p: string) => p),
+  toPosixPath: jest.fn((p: string) => p)
+}));
+
+jest.unstable_mockModule('@actions/io', () => ({
+  which: jest.fn(),
+  mkdirP: jest.fn(),
+  rmRF: jest.fn(),
+  mv: jest.fn(),
+  cp: jest.fn()
+}));
+
+jest.unstable_mockModule('@actions/tool-cache', () => ({
+  find: jest.fn(),
+  findAllVersions: jest.fn(),
+  downloadTool: jest.fn(),
+  extractTar: jest.fn(),
+  extractZip: jest.fn(),
+  extractXar: jest.fn(),
+  extract7z: jest.fn(),
+  cacheDir: jest.fn(),
+  cacheFile: jest.fn(),
+  getManifestFromRepo: jest.fn(),
+  findFromManifest: jest.fn(),
+  HTTPError: class HTTPError extends Error {
+    readonly httpStatusCode: number;
+    constructor(httpStatusCode?: number) {
+      super(`Unexpected HTTP response: ${httpStatusCode}`);
+      this.httpStatusCode = httpStatusCode ?? 0;
+    }
+  }
+}));
+
+const _mockGetJson = jest.fn();
+jest.unstable_mockModule('@actions/http-client', () => ({
+  HttpClient: jest.fn().mockImplementation(() => ({
+    getJson: _mockGetJson
+  }))
+}));
+
+jest.unstable_mockModule('@actions/exec', () => ({
+  exec: jest.fn(),
+  getExecOutput: jest.fn()
+}));
+
+jest.unstable_mockModule('@actions/cache', () => ({
+  saveCache: jest.fn(),
+  restoreCache: jest.fn(),
+  isFeatureAvailable: jest.fn()
+}));
+
+const realAuth = await import('../src/authutil.js');
+jest.unstable_mockModule('../src/authutil.js', () => ({
+  ...realAuth,
+  configAuthentication: jest.fn()
+}));
+
+// Dynamic imports after mocking
+const core = await import('@actions/core');
+const io = await import('@actions/io');
+const tc = await import('@actions/tool-cache');
+const httpm = await import('@actions/http-client');
+const exec = await import('@actions/exec');
+const cache = await import('@actions/cache');
+const main = await import('../src/main.js');
+const auth = await import('../src/authutil.js');
+
+const {default: nodeTestDist} = await import('./data/node-dist-index.json', {
+  with: {type: 'json'}
+});
+const {default: nodeTestDistNightly} = await import(
+  './data/node-nightly-index.json',
+  {with: {type: 'json'}}
+);
+const {default: nodeTestDistRc} = await import('./data/node-rc-index.json', {
+  with: {type: 'json'}
+});
+const {default: nodeV8CanaryTestDist} = await import(
+  './data/v8-canary-dist-index.json',
+  {with: {type: 'json'}}
+);
+
+import type {INodeVersion} from '../src/distributions/base-models.js';
 
 describe('setup-node', () => {
   let inputs = {} as any;
   let os = {} as any;
 
-  let inSpy: jest.SpyInstance;
-  let findSpy: jest.SpyInstance;
-  let findAllVersionsSpy: jest.SpyInstance;
-  let cnSpy: jest.SpyInstance;
-  let logSpy: jest.SpyInstance;
-  let warningSpy: jest.SpyInstance;
-  let platSpy: jest.SpyInstance;
-  let archSpy: jest.SpyInstance;
-  let dlSpy: jest.SpyInstance;
-  let exSpy: jest.SpyInstance;
-  let cacheSpy: jest.SpyInstance;
-  let dbgSpy: jest.SpyInstance;
-  let whichSpy: jest.SpyInstance;
-  let existsSpy: jest.SpyInstance;
-  let mkdirpSpy: jest.SpyInstance;
-  let execSpy: jest.SpyInstance;
-  let authSpy: jest.SpyInstance;
-  let isCacheActionAvailable: jest.SpyInstance;
-  let getExecOutputSpy: jest.SpyInstance;
-  let getJsonSpy: jest.SpyInstance;
+  let inSpy: jest.Mock;
+  let findSpy: jest.Mock;
+  let findAllVersionsSpy: jest.Mock;
+  let cnSpy: jest.SpiedFunction<typeof process.stdout.write>;
+  let logSpy: jest.Mock;
+  let warningSpy: jest.Mock;
+  let addPathSpy: jest.Mock;
+  let setFailedSpy: jest.Mock;
+  let platSpy: jest.SpiedFunction<typeof osm.platform>;
+  let archSpy: jest.SpiedFunction<typeof osm.arch>;
+  let dlSpy: jest.Mock;
+  let exSpy: jest.Mock;
+  let cacheSpy: jest.Mock;
+  let dbgSpy: jest.Mock;
+  let whichSpy: jest.Mock;
+  let existsSpy: jest.SpiedFunction<typeof fs.existsSync>;
+  let mkdirpSpy: jest.Mock;
+  let execSpy: jest.SpiedFunction<typeof cp.execSync>;
+  let authSpy: jest.Mock;
+  let isCacheActionAvailable: jest.Mock;
+  let getExecOutputSpy: jest.Mock;
+  let getJsonSpy: jest.Mock;
 
   beforeEach(() => {
     // @actions/core
@@ -48,8 +154,8 @@ describe('setup-node', () => {
     process.env['GITHUB_PATH'] = ''; // Stub out ENV file functionality so we can verify it writes to standard out
     process.env['GITHUB_OUTPUT'] = ''; // Stub out ENV file functionality so we can verify it writes to standard out
     inputs = {};
-    inSpy = jest.spyOn(core, 'getInput');
-    inSpy.mockImplementation(name => inputs[name]);
+    inSpy = core.getInput as jest.Mock;
+    inSpy.mockImplementation((name: any) => inputs[name]);
 
     // node
     os = {};
@@ -60,30 +166,33 @@ describe('setup-node', () => {
     execSpy = jest.spyOn(cp, 'execSync');
 
     // @actions/tool-cache
-    findSpy = jest.spyOn(tc, 'find');
-    findAllVersionsSpy = jest.spyOn(tc, 'findAllVersions');
-    dlSpy = jest.spyOn(tc, 'downloadTool');
-    exSpy = jest.spyOn(tc, 'extractTar');
-    cacheSpy = jest.spyOn(tc, 'cacheDir');
-    // getDistSpy = jest.spyOn(im, 'getVersionsFromDist');
+    findSpy = tc.find as jest.Mock;
+    findAllVersionsSpy = tc.findAllVersions as jest.Mock;
+    dlSpy = tc.downloadTool as jest.Mock;
+    exSpy = tc.extractTar as jest.Mock;
+    cacheSpy = tc.cacheDir as jest.Mock;
+    // getDistSpy = jest.spyOn(im, 'getVersionsFromDist') as jest.Mock;
 
     // http-client
-    getJsonSpy = jest.spyOn(httpm.HttpClient.prototype, 'getJson');
+    getJsonSpy = _mockGetJson;
+    (httpm.HttpClient as jest.Mock).mockImplementation(() => ({
+      getJson: _mockGetJson
+    }));
 
     // io
-    whichSpy = jest.spyOn(io, 'which');
+    whichSpy = io.which as jest.Mock;
     existsSpy = jest.spyOn(fs, 'existsSync');
-    mkdirpSpy = jest.spyOn(io, 'mkdirP');
+    mkdirpSpy = io.mkdirP as jest.Mock;
 
     // @actions/tool-cache
-    isCacheActionAvailable = jest.spyOn(cache, 'isFeatureAvailable');
+    isCacheActionAvailable = cache.isFeatureAvailable as jest.Mock;
     isCacheActionAvailable.mockImplementation(() => false);
 
     // disable authentication portion for installer tests
-    authSpy = jest.spyOn(auth, 'configAuthentication');
+    authSpy = auth.configAuthentication as jest.Mock;
     authSpy.mockImplementation(() => {});
 
-    getJsonSpy.mockImplementation(url => {
+    getJsonSpy.mockImplementation((url: any) => {
       let res: any;
       if (url.includes('/rc')) {
         res = <INodeVersion[]>nodeTestDistRc;
@@ -98,28 +207,18 @@ describe('setup-node', () => {
 
     // writes
     cnSpy = jest.spyOn(process.stdout, 'write');
-    logSpy = jest.spyOn(core, 'info');
-    dbgSpy = jest.spyOn(core, 'debug');
-    warningSpy = jest.spyOn(core, 'warning');
-    cnSpy.mockImplementation(line => {
-      // uncomment to debug
-      // process.stderr.write('write:' + line + '\n');
-    });
-    logSpy.mockImplementation(line => {
-      // uncomment to debug
-      // process.stderr.write('log:' + line + '\n');
-    });
-    dbgSpy.mockImplementation(msg => {
-      // uncomment to see debug output
-      // process.stderr.write(msg + '\n');
-    });
-    warningSpy.mockImplementation(msg => {
-      // uncomment to debug
-      // process.stderr.write('log:' + msg + '\n');
-    });
+    logSpy = core.info as jest.Mock;
+    dbgSpy = core.debug as jest.Mock;
+    warningSpy = core.warning as jest.Mock;
+    addPathSpy = core.addPath as jest.Mock;
+    setFailedSpy = core.setFailed as jest.Mock;
+    cnSpy.mockImplementation(() => true);
+    logSpy.mockImplementation(() => {});
+    dbgSpy.mockImplementation(() => {});
+    warningSpy.mockImplementation(() => {});
 
     // @actions/exec
-    getExecOutputSpy = jest.spyOn(exec, 'getExecOutput');
+    getExecOutputSpy = exec.getExecOutput as jest.Mock;
     getExecOutputSpy.mockImplementation(() => 'v16.15.0-rc.1');
   });
 
@@ -152,7 +251,7 @@ describe('setup-node', () => {
   it('finds version in cache with stable not supplied', async () => {
     inputs['node-version'] = '12.0.0-rc.1';
 
-    inSpy.mockImplementation(name => inputs[name]);
+    inSpy.mockImplementation((name: any) => inputs[name]);
 
     const toolPath = path.normalize('/cache/node/12.0.0-rc.1/x64');
     findSpy.mockImplementation(() => toolPath);
@@ -164,14 +263,14 @@ describe('setup-node', () => {
   it('finds version in cache and adds it to the path', async () => {
     inputs['node-version'] = '12.0.0-rc.1';
 
-    inSpy.mockImplementation(name => inputs[name]);
+    inSpy.mockImplementation((name: any) => inputs[name]);
 
     const toolPath = path.normalize('/cache/node/12.0.0-rc.1/x64');
     findSpy.mockImplementation(() => toolPath);
     await main.run();
 
     const expPath = path.join(toolPath, 'bin');
-    expect(cnSpy).toHaveBeenCalledWith(`::add-path::${expPath}${osm.EOL}`);
+    expect(addPathSpy).toHaveBeenCalledWith(expPath);
   });
 
   it('handles unhandled find error and reports error', async () => {
@@ -184,7 +283,7 @@ describe('setup-node', () => {
 
     await main.run();
 
-    expect(cnSpy).toHaveBeenCalledWith('::error::' + errMsg + osm.EOL);
+    expect(setFailedSpy).toHaveBeenCalledWith(errMsg);
   });
 
   it('falls back to a version from node dist', async () => {
@@ -212,7 +311,7 @@ describe('setup-node', () => {
     expect(exSpy).toHaveBeenCalled();
     expect(logSpy).toHaveBeenCalledWith('Extracting ...');
     expect(logSpy).toHaveBeenCalledWith('Done');
-    expect(cnSpy).toHaveBeenCalledWith(`::add-path::${expPath}${osm.EOL}`);
+    expect(addPathSpy).toHaveBeenCalledWith(expPath);
   });
 
   it('does not find a version that does not exist', async () => {
@@ -225,8 +324,8 @@ describe('setup-node', () => {
     findSpy.mockImplementation(() => '');
     await main.run();
 
-    expect(cnSpy).toHaveBeenCalledWith(
-      `::error::Unable to find Node version '${versionSpec}' for platform ${os.platform} and architecture ${os.arch}.${osm.EOL}`
+    expect(setFailedSpy).toHaveBeenCalledWith(
+      `Unable to find Node version '${versionSpec}' for platform ${os.platform} and architecture ${os.arch}.`
     );
   });
 
@@ -247,7 +346,7 @@ describe('setup-node', () => {
     });
     await main.run();
 
-    expect(cnSpy).toHaveBeenCalledWith(`::error::${errMsg}${osm.EOL}`);
+    expect(setFailedSpy).toHaveBeenCalledWith(errMsg);
   });
 
   it('acquires specified architecture of node', async () => {
@@ -263,7 +362,6 @@ describe('setup-node', () => {
         darwin: 'darwin',
         win32: 'win'
       }[os.platform];
-
       inputs['node-version'] = version;
       inputs['architecture'] = arch;
       inputs['token'] = 'faketoken';
@@ -334,9 +432,7 @@ describe('setup-node', () => {
         // assert
         expect(logSpy).toHaveBeenCalledWith('Extracting ...');
         expect(logSpy).toHaveBeenCalledWith('Adding to the cache ...');
-        expect(cnSpy).toHaveBeenCalledWith(
-          `::add-path::${path.join(toolPath, 'bin')}${osm.EOL}`
-        );
+        expect(addPathSpy).toHaveBeenCalledWith(path.join(toolPath, 'bin'));
       }
     );
 
@@ -370,9 +466,7 @@ describe('setup-node', () => {
 
         // assert
         expect(logSpy).toHaveBeenCalledWith(`Found in cache @ ${toolPath}`);
-        expect(cnSpy).toHaveBeenCalledWith(
-          `::add-path::${path.join(toolPath, 'bin')}${osm.EOL}`
-        );
+        expect(addPathSpy).toHaveBeenCalledWith(path.join(toolPath, 'bin'));
       }
     );
 
@@ -391,8 +485,8 @@ describe('setup-node', () => {
       await main.run();
 
       // assert
-      expect(cnSpy).toHaveBeenCalledWith(
-        `::error::Unable to find Node version '${versionSpec}' for platform ${os.platform} and architecture ${os.arch}.${osm.EOL}`
+      expect(setFailedSpy).toHaveBeenCalledWith(
+        `Unable to find Node version '${versionSpec}' for platform ${os.platform} and architecture ${os.arch}.`
       );
     });
   });

dist/cache-save/package.json

@@ -0,0 +1,3 @@
+{
+  "type": "module"
+}

dist/setup/package.json

@@ -0,0 +1,3 @@
+{
+  "type": "module"
+}

eslint.config.mjs

@@ -0,0 +1,73 @@
+// 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.
+import js from '@eslint/js';
+import tsParser from '@typescript-eslint/parser';
+import tsPlugin from '@typescript-eslint/eslint-plugin';
+import jest from 'eslint-plugin-jest';
+import n from 'eslint-plugin-n';
+import prettier from 'eslint-config-prettier';
+import globals from 'globals';
+
+export default [
+  {
+    ignores: ['**/*', '!src/**', '!__tests__/**']
+  },
+  js.configs.recommended,
+  {
+    files: ['**/*.ts'],
+    languageOptions: {
+      parser: tsParser,
+      ecmaVersion: 2022,
+      sourceType: 'module',
+      globals: {
+        ...globals.node,
+        ...globals.es2015
+      }
+    },
+    plugins: {
+      '@typescript-eslint': tsPlugin,
+      n
+    },
+    rules: {
+      ...tsPlugin.configs.recommended.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}],
+      'no-useless-assignment': 'off',
+      'n/no-extraneous-import': 'error'
+    }
+  },
+  {
+    files: ['**/*{test,spec}.ts'],
+    plugins: {jest},
+    languageOptions: {
+      globals: {
+        ...globals.jest
+      }
+    },
+    rules: {
+      ...jest.configs['flat/recommended'].rules,
+      '@typescript-eslint/no-unused-vars': 'off',
+      'jest/no-standalone-expect': 'off',
+      'jest/no-conditional-expect': 'off',
+      'no-console': 'off'
+    }
+  },
+  prettier
+];

jest.config.js

@@ -1,11 +0,0 @@
-module.exports = {
-  clearMocks: true,
-  moduleFileExtensions: ['js', 'ts'],
-  testEnvironment: 'node',
-  testMatch: ['**/*.test.ts'],
-  testRunner: 'jest-circus/runner',
-  transform: {
-    '^.+\\.ts$': 'ts-jest'
-  },
-  verbose: true
-}

jest.config.ts

@@ -0,0 +1,24 @@
+export default {
+  clearMocks: true,
+  moduleFileExtensions: ['js', 'ts'],
+  roots: ['<rootDir>'],
+  testEnvironment: 'node',
+  testMatch: ['**/*.test.ts'],
+  transform: {
+    '^.+\\.ts$': [
+      'ts-jest',
+      {
+        useESM: true,
+        diagnostics: {
+          ignoreCodes: [151002]
+        }
+      }
+    ]
+  },
+  extensionsToTreatAsEsm: ['.ts'],
+  transformIgnorePatterns: ['node_modules/(?!(@actions)/)'],
+  moduleNameMapper: {
+    '^(\\.{1,2}/.*)\\.js$': '$1'
+  },
+  verbose: true
+}

package.json

@@ -1,6 +1,7 @@
 {
   "name": "setup-node",
-  "version": "6.5.0",
+  "version": "6.4.0",
+  "type": "module",
   "private": true,
   "description": "setup node action",
   "main": "lib/setup-node.js",
@@ -9,11 +10,11 @@
   },
   "scripts": {
     "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:fix": "eslint --config ./.eslintrc.js \"**/*.ts\" --fix",
-    "test": "jest --coverage",
+    "format": "prettier --no-error-on-unmatched-pattern --write \"**/*.{ts,yml,yaml}\"",
+    "format-check": "prettier --no-error-on-unmatched-pattern --check \"**/*.{ts,yml,yaml}\"",
+    "lint": "eslint \"**/*.ts\"",
+    "lint:fix": "eslint \"**/*.ts\" --fix",
+    "test": "node --experimental-vm-modules ./node_modules/jest/bin/jest.js --runInBand --coverage",
     "pre-checkin": "npm run format && npm run lint:fix && npm run build && npm test"
   },
   "repository": {
@@ -28,36 +29,35 @@
   "author": "GitHub",
   "license": "MIT",
   "dependencies": {
-    "@actions/cache": "^5.1.0",
-    "@actions/core": "^2.0.3",
-    "@actions/exec": "^2.0.0",
-    "@actions/github": "^6.0.1",
-    "@actions/glob": "^0.5.1",
-    "@actions/http-client": "^3.0.2",
-    "@actions/io": "^2.0.0",
-    "@actions/tool-cache": "^3.0.1",
-    "semver": "^7.6.3"
+    "@actions/cache": "^6.1.0",
+    "@actions/core": "^3.0.1",
+    "@actions/exec": "^3.0.0",
+    "@actions/github": "^9.1.1",
+    "@actions/glob": "^0.7.0",
+    "@actions/http-client": "^4.0.1",
+    "@actions/io": "^3.0.2",
+    "@actions/tool-cache": "^4.0.0",
+    "semver": "^7.8.5"
   },
   "devDependencies": {
-    "@types/jest": "^29.5.14",
-    "@types/node": "^24.1.0",
-    "@types/semver": "^7.5.8",
-    "@typescript-eslint/eslint-plugin": "^5.54.0",
-    "@typescript-eslint/parser": "^5.54.0",
-    "@vercel/ncc": "^0.38.3",
-    "eslint": "^8.57.0",
-    "eslint-config-prettier": "^8.6.0",
-    "eslint-plugin-jest": "^27.9.0",
-    "eslint-plugin-node": "^11.1.0",
-    "jest": "^29.7.0",
-    "jest-circus": "^29.7.0",
-    "jest-each": "^29.7.0",
-    "prettier": "^3.6.2",
-    "ts-jest": "^29.4.1",
-    "typescript": "^5.4.2"
-  },
-  "overrides": {
-    "undici": "^6.24.1",
-    "fast-xml-parser": "^5.9.2"
+    "@eslint/js": "^10.0.1",
+    "@jest/globals": "^30.4.1",
+    "@types/jest": "^30.0.0",
+    "@types/node": "^26.0.0",
+    "@types/semver": "^7.7.0",
+    "@typescript-eslint/eslint-plugin": "^8.62.0",
+    "@typescript-eslint/parser": "^8.62.0",
+    "@vercel/ncc": "^0.44.0",
+    "eslint": "^10.5.0",
+    "eslint-config-prettier": "^10.1.8",
+    "eslint-plugin-jest": "^29.15.2",
+    "eslint-plugin-n": "^18.1.0",
+    "globals": "^17.7.0",
+    "jest": "^30.4.2",
+    "jest-each": "^30.4.1",
+    "prettier": "^3.8.4",
+    "ts-jest": "^29.4.11",
+    "ts-node": "^10.9.2",
+    "typescript": "^6.0.3"
   }
 }

src/cache-restore.ts

@@ -5,13 +5,13 @@ import path from 'path';
 import fs from 'fs';
 import os from 'os';
 
-import {State} from './constants';
+import {State} from './constants.js';
 import {
   getCacheDirectories,
   getPackageManagerInfo,
   repoHasYarnBerryManagedDependencies,
   PackageManagerInfo
-} from './cache-utils';
+} from './cache-utils.js';
 
 export const restoreCache = async (
   packageManager: string,

src/cache-save.ts

@@ -1,8 +1,8 @@
 import * as core from '@actions/core';
 import * as cache from '@actions/cache';
 
-import {State} from './constants';
-import {getPackageManagerInfo} from './cache-utils';
+import {State} from './constants.js';
+import {getPackageManagerInfo} from './cache-utils.js';
 
 // Catch and log any unhandled exceptions.  These exceptions can leak out of the uploadChunk method in
 // @actions/toolkit when a failed upload closes the file descriptor causing any in-process reads to

src/cache-utils.ts

@@ -4,7 +4,7 @@ import * as cache from '@actions/cache';
 import * as glob from '@actions/glob';
 import path from 'path';
 import fs from 'fs';
-import {unique} from './util';
+import {unique} from './util.js';
 
 export interface PackageManagerInfo {
   name: string;
@@ -91,7 +91,7 @@ export const getCommandOutputNotEmpty = async (
   error: string,
   cwd?: string
 ): Promise<string> => {
-  const stdOut = getCommandOutput(toolCommand, cwd);
+  const stdOut = await getCommandOutput(toolCommand, cwd);
   if (!stdOut) {
     throw new Error(error);
   }

src/distributions/base-distribution-prerelease.ts

@@ -2,8 +2,8 @@ import * as tc from '@actions/tool-cache';
 
 import semver from 'semver';
 
-import BaseDistribution from './base-distribution';
-import {NodeInputs} from './base-models';
+import BaseDistribution from './base-distribution.js';
+import {NodeInputs} from './base-models.js';
 
 export default abstract class BasePrereleaseNodejs extends BaseDistribution {
   protected abstract distribution: string;

src/distributions/base-distribution.ts

@@ -9,8 +9,8 @@ import * as assert from 'assert';
 import * as path from 'path';
 import os from 'os';
 import fs from 'fs';
-
-import {NodeInputs, INodeVersion, INodeVersionInfo} from './base-models';
+import {fileURLToPath} from 'url';
+import {NodeInputs, INodeVersion, INodeVersionInfo} from './base-models.js';
 
 export default abstract class BaseDistribution {
   protected httpClient: hc.HttpClient;
@@ -26,9 +26,8 @@ export default abstract class BaseDistribution {
   protected abstract getDistributionUrl(mirror: string): string;
 
   public async setupNodeJs() {
-    let nodeJsVersions: INodeVersion[] | undefined;
     if (this.nodeInfo.checkLatest) {
-      const evaluatedVersion = await this.findVersionInDist(nodeJsVersions);
+      const evaluatedVersion = await this.findVersionInDist(undefined);
       this.nodeInfo.versionSpec = evaluatedVersion;
     }
 
@@ -36,7 +35,7 @@ export default abstract class BaseDistribution {
     if (toolPath) {
       core.info(`Found in cache @ ${toolPath}`);
     } else {
-      const evaluatedVersion = await this.findVersionInDist(nodeJsVersions);
+      const evaluatedVersion = await this.findVersionInDist(undefined);
       const toolName = this.getNodejsDistInfo(evaluatedVersion);
       toolPath = await this.downloadNodejs(toolName);
     }
@@ -168,12 +167,14 @@ export default abstract class BaseDistribution {
     return toolPath;
   }
 
-  protected validRange(versionSpec: string) {
-    let options: semver.RangeOptions | undefined;
+  protected validRange(versionSpec: string): {
+    range: string;
+    options: semver.RangeOptions | undefined;
+  } {
     const c = semver.clean(versionSpec) || '';
     const valid = semver.valid(c) ?? versionSpec;
 
-    return {range: valid, options};
+    return {range: valid, options: undefined};
   }
 
   protected async acquireWindowsNodeFromFallbackLocation(
@@ -259,7 +260,12 @@ export default abstract class BaseDistribution {
         fs.renameSync(downloadPath, renamedArchive);
         extPath = await tc.extractZip(renamedArchive);
       } else {
-        const _7zPath = path.join(__dirname, '../..', 'externals', '7zr.exe');
+        const _7zPath = path.join(
+          path.dirname(fileURLToPath(import.meta.url)),
+          '../..',
+          'externals',
+          '7zr.exe'
+        );
         extPath = await tc.extract7z(downloadPath, undefined, _7zPath);
       }
       // 7z extracts to folder matching file name

src/distributions/installer-factory.ts

@@ -1,9 +1,9 @@
-import BaseDistribution from './base-distribution';
-import {NodeInputs} from './base-models';
-import NightlyNodejs from './nightly/nightly_builds';
-import OfficialBuilds from './official_builds/official_builds';
-import RcBuild from './rc/rc_builds';
-import CanaryBuild from './v8-canary/canary_builds';
+import BaseDistribution from './base-distribution.js';
+import {NodeInputs} from './base-models.js';
+import NightlyNodejs from './nightly/nightly_builds.js';
+import OfficialBuilds from './official_builds/official_builds.js';
+import RcBuild from './rc/rc_builds.js';
+import CanaryBuild from './v8-canary/canary_builds.js';
 
 enum Distributions {
   DEFAULT = '',

src/distributions/nightly/nightly_builds.ts

@@ -1,5 +1,5 @@
-import BasePrereleaseNodejs from '../base-distribution-prerelease';
-import {NodeInputs} from '../base-models';
+import BasePrereleaseNodejs from '../base-distribution-prerelease.js';
+import {NodeInputs} from '../base-models.js';
 
 export default class NightlyNodejs extends BasePrereleaseNodejs {
   protected distribution = 'nightly';

src/distributions/official_builds/official_builds.ts

@@ -2,8 +2,8 @@ import * as core from '@actions/core';
 import * as tc from '@actions/tool-cache';
 import path from 'path';
 
-import BaseDistribution from '../base-distribution';
-import {NodeInputs, INodeVersion, INodeVersionInfo} from '../base-models';
+import BaseDistribution from '../base-distribution.js';
+import {NodeInputs, INodeVersion, INodeVersionInfo} from '../base-models.js';
 
 interface INodeRelease extends tc.IToolRelease {
   lts?: string;

src/distributions/rc/rc_builds.ts

@@ -1,5 +1,5 @@
-import BaseDistribution from '../base-distribution';
-import {NodeInputs} from '../base-models';
+import BaseDistribution from '../base-distribution.js';
+import {NodeInputs} from '../base-models.js';
 
 export default class RcBuild extends BaseDistribution {
   constructor(nodeInfo: NodeInputs) {

src/distributions/v8-canary/canary_builds.ts

@@ -1,5 +1,5 @@
-import BasePrereleaseNodejs from '../base-distribution-prerelease';
-import {NodeInputs} from '../base-models';
+import BasePrereleaseNodejs from '../base-distribution-prerelease.js';
+import {NodeInputs} from '../base-models.js';
 
 export default class CanaryBuild extends BasePrereleaseNodejs {
   protected distribution = 'v8-canary';

src/main.ts

@@ -2,14 +2,15 @@ import * as core from '@actions/core';
 
 import os from 'os';
 import fs from 'fs';
+import {fileURLToPath} from 'url';
 
-import * as auth from './authutil';
+import * as auth from './authutil.js';
 import * as path from 'path';
-import {restoreCache} from './cache-restore';
-import {isCacheFeatureAvailable} from './cache-utils';
-import {getNodejsDistribution} from './distributions/installer-factory';
-import {getNodeVersionFromFile, printEnvDetailsAndSetOutput} from './util';
-import {State} from './constants';
+import {restoreCache} from './cache-restore.js';
+import {isCacheFeatureAvailable} from './cache-utils.js';
+import {getNodejsDistribution} from './distributions/installer-factory.js';
+import {getNodeVersionFromFile, printEnvDetailsAndSetOutput} from './util.js';
+import {State} from './constants.js';
 
 export async function run() {
   try {
@@ -87,7 +88,11 @@ export async function run() {
       }
     }
 
-    const matchersPath = path.join(__dirname, '../..', '.github');
+    const matchersPath = path.join(
+      path.dirname(fileURLToPath(import.meta.url)),
+      '../..',
+      '.github'
+    );
     core.info(`##[add-matcher]${path.join(matchersPath, 'tsc.json')}`);
     core.info(
       `##[add-matcher]${path.join(matchersPath, 'eslint-stylish.json')}`

src/setup-node.ts

@@ -1,3 +1,3 @@
-import {run} from './main';
+import {run} from './main.js';
 
 run();

src/util.ts

@@ -105,7 +105,7 @@ async function getToolVersion(tool: string, options: string[]) {
     }
 
     return stdout.trim();
-  } catch (err) {
+  } catch {
     return '';
   }
 }

tsconfig.json

@@ -1,7 +1,7 @@
 {
   "compilerOptions": {
     "target": "ES2022",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'. */
-    "module": "commonjs",                     /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
+    "module": "NodeNext",                     /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
     "outDir": "./lib",                        /* Redirect output structure to the directory. */
     "rootDir": "./src",                       /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
     "sourceMap": true,
@@ -10,5 +10,5 @@
     "esModuleInterop": true,                   /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
     "resolveJsonModule": true,                /* Allows importing modules with a '.json' extension, which is a common practice in node projects. */
   },
-  "exclude": ["__tests__", "lib", "node_modules"]
+  "exclude": ["__tests__", "lib", "node_modules", "jest.config.ts"]
 }