Migrate to ESM and upgrade dependencies

.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

@@ -10,8 +10,11 @@ allowed:
   - mit
   - cc0-1.0
   - unlicense
+  - blueoak-1.0.0
 
 reviewed:
   npm:
     - "@actions/http-client" # MIT (license text present), but detected as "other"
     - "argparse" # Python Software Foundation License (PSF), but detected as "other"
+    - "balanced-match"
+    - "brace-expansion"

.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"
+}

README.md

@@ -18,6 +18,10 @@ The `setup-java` action provides the following functionality for GitHub Actions
 
 This action allows you to work with Java and Scala projects.
 
+## Breaking changes in V6
+
+- **Migrated to ESM** to enable support for the latest `@actions/*` package versions.
+
 ## Breaking changes in V5
 
 - Upgraded action from node20 to node24

__tests__/auth.test.ts

@@ -1,24 +1,63 @@
+import {
+  jest,
+  describe,
+  it,
+  expect,
+  beforeEach,
+  afterEach,
+  beforeAll,
+  afterAll
+} from '@jest/globals';
+import {fileURLToPath} from 'url';
 import * as io from '@actions/io';
-import * as core from '@actions/core';
 import * as fs from 'fs';
 import * as path from 'path';
 import os from 'os';
 
-import * as auth from '../src/auth';
+// Mock @actions/core before importing source modules that depend on it
-import {M2_DIR, MVN_SETTINGS_FILE} from '../src/constants';
+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)
+}));
 
+// Dynamic imports after mocking
+const core = await import('@actions/core');
+const auth = await import('../src/auth.js');
+const {M2_DIR, MVN_SETTINGS_FILE} = await import('../src/constants.js');
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
 const m2Dir = path.join(__dirname, M2_DIR);
 const settingsFile = path.join(m2Dir, MVN_SETTINGS_FILE);
 
 describe('auth tests', () => {
-  let spyOSHomedir: jest.SpyInstance;
+  let spyOSHomedir: any;
-  let spyInfo: jest.SpyInstance;
+  let spyInfo: any;
 
   beforeEach(async () => {
     await io.rmRF(m2Dir);
     spyOSHomedir = jest.spyOn(os, 'homedir');
     spyOSHomedir.mockReturnValue(__dirname);
-    spyInfo = jest.spyOn(core, 'info');
+    spyInfo = core.info as jest.Mock;
     spyInfo.mockImplementation(() => null);
   }, 300000);
 

__tests__/cache.test.ts

@@ -1,23 +1,84 @@
+import {
+  jest,
+  describe,
+  it,
+  expect,
+  beforeEach,
+  afterEach,
+  beforeAll,
+  afterAll
+} from '@jest/globals';
 import {mkdtempSync} from 'fs';
 import {tmpdir} from 'os';
 import {join} from 'path';
-import {restore, save} from '../src/cache';
 import * as fs from 'fs';
 import * as os from 'os';
-import * as core from '@actions/core';
+
-import * as cache from '@actions/cache';
+// Mock @actions/core before importing source modules that depend on it
-import * as glob from '@actions/glob';
+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', () => ({
+  restoreCache: jest.fn(),
+  saveCache: jest.fn(),
+  isFeatureAvailable: jest.fn(),
+  ValidationError: class ValidationError extends Error {
+    constructor(message: string) {
+      super(message);
+      this.name = 'ValidationError';
+    }
+  },
+  ReserveCacheError: class ReserveCacheError extends Error {
+    constructor(message: string) {
+      super(message);
+      this.name = 'ReserveCacheError';
+    }
+  }
+}));
+
+jest.unstable_mockModule('@actions/glob', () => ({
+  hashFiles: jest.fn(),
+  create: 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 {restore, save} = await import('../src/cache.js');
 
 describe('dependency cache', () => {
   const ORIGINAL_RUNNER_OS = process.env['RUNNER_OS'];
   const ORIGINAL_GITHUB_WORKSPACE = process.env['GITHUB_WORKSPACE'];
   const ORIGINAL_CWD = process.cwd();
   let workspace: string;
-  let spyInfo: jest.SpyInstance<void, Parameters<typeof core.info>>;
+  let spyInfo: any;
-  let spyWarning: jest.SpyInstance<void, Parameters<typeof core.warning>>;
+  let spyWarning: any;
-  let spyDebug: jest.SpyInstance<void, Parameters<typeof core.debug>>;
+  let spyDebug: any;
-  let spySaveState: jest.SpyInstance<void, Parameters<typeof core.saveState>>;
+  let spySaveState: any;
-  let spyCoreError: jest.SpyInstance;
+  let spyCoreError: any;
 
   beforeEach(() => {
     workspace = mkdtempSync(join(tmpdir(), 'setup-java-cache-'));
@@ -41,20 +102,20 @@ describe('dependency cache', () => {
   });
 
   beforeEach(() => {
-    spyInfo = jest.spyOn(core, 'info');
+    spyInfo = core.info as jest.Mock;
     spyInfo.mockImplementation(() => null);
 
-    spyWarning = jest.spyOn(core, 'warning');
+    spyWarning = core.warning as jest.Mock;
     spyWarning.mockImplementation(() => null);
 
-    spyDebug = jest.spyOn(core, 'debug');
+    spyDebug = core.debug as jest.Mock;
     spyDebug.mockImplementation(() => null);
 
-    spySaveState = jest.spyOn(core, 'saveState');
+    spySaveState = core.saveState as jest.Mock;
     spySaveState.mockImplementation(() => null);
 
     // Mock core.error to suppress error logs
-    spyCoreError = jest.spyOn(core, 'error');
+    spyCoreError = core.error as jest.Mock;
     spyCoreError.mockImplementation(() => {});
   });
 
@@ -70,22 +131,15 @@ describe('dependency cache', () => {
   });
 
   describe('restore', () => {
-    let spyCacheRestore: jest.SpyInstance<
+    let spyCacheRestore: any;
-      ReturnType<typeof cache.restoreCache>,
+    let spyGlobHashFiles: any;
-      Parameters<typeof cache.restoreCache>
-    >;
-    let spyGlobHashFiles: jest.SpyInstance<
-      ReturnType<typeof glob.hashFiles>,
-      Parameters<typeof glob.hashFiles>
-    >;
 
     beforeEach(() => {
-      spyCacheRestore = jest
+      spyCacheRestore = (cache.restoreCache as any).mockImplementation(
-        .spyOn(cache, 'restoreCache')
+        (paths: string[], primaryKey: string) => Promise.resolve(undefined)
-        .mockImplementation((paths: string[], primaryKey: string) =>
-          Promise.resolve(undefined)
       );
-      spyGlobHashFiles = jest.spyOn(glob, 'hashFiles');
+      spyGlobHashFiles = glob.hashFiles as jest.Mock;
+      spyGlobHashFiles.mockResolvedValue('hash-stub');
       spyWarning.mockImplementation(() => null);
     });
 
@@ -97,6 +151,7 @@ describe('dependency cache', () => {
 
     describe('for maven', () => {
       it('throws error if no pom.xml or maven-wrapper.properties found', async () => {
+        spyGlobHashFiles.mockResolvedValue('');
         await expect(restore('maven', '')).rejects.toThrow(
           `No file in ${projectRoot(
             workspace
@@ -144,6 +199,7 @@ describe('dependency cache', () => {
     });
     describe('for gradle', () => {
       it('throws error if no build.gradle found', async () => {
+        spyGlobHashFiles.mockResolvedValue('');
         await expect(restore('gradle', '')).rejects.toThrow(
           `No file in ${projectRoot(
             workspace
@@ -199,6 +255,7 @@ describe('dependency cache', () => {
     });
     describe('for sbt', () => {
       it('throws error if no build.sbt found', async () => {
+        spyGlobHashFiles.mockResolvedValue('');
         await expect(restore('sbt', '')).rejects.toThrow(
           `No file in ${projectRoot(
             workspace
@@ -217,6 +274,13 @@ describe('dependency cache', () => {
         expect(spyInfo).toHaveBeenCalledWith('sbt cache is not found');
       });
       it('detects scala and sbt changes under **/project/ folder', async () => {
+        let callCount = 0;
+        spyGlobHashFiles.mockImplementation(async () => {
+          callCount++;
+          // Return same hash for first two calls, different for third
+          return callCount <= 2 ? 'hash-v1' : 'hash-v2';
+        });
+
         createFile(join(workspace, 'build.sbt'));
         createDirectory(join(workspace, 'project'));
         createFile(join(workspace, 'project/DependenciesV1.scala'));
@@ -252,6 +316,7 @@ describe('dependency cache', () => {
     });
     describe('cache-dependency-path', () => {
       it('throws error if no matching dependency file found', async () => {
+        spyGlobHashFiles.mockResolvedValue('');
         createFile(join(workspace, 'build.gradle.kts'));
         await expect(
           restore('gradle', 'sub-project/**/build.gradle.kts')
@@ -293,16 +358,11 @@ describe('dependency cache', () => {
     });
   });
   describe('save', () => {
-    let spyCacheSave: jest.SpyInstance<
+    let spyCacheSave: any;
-      ReturnType<typeof cache.saveCache>,
-      Parameters<typeof cache.saveCache>
-    >;
 
     beforeEach(() => {
-      spyCacheSave = jest
+      spyCacheSave = (cache.saveCache as any).mockImplementation(
-        .spyOn(cache, 'saveCache')
+        (paths: string[], key: string) => Promise.resolve(0)
-        .mockImplementation((paths: string[], key: string) =>
-          Promise.resolve(0)
       );
       spyWarning.mockImplementation(() => null);
     });
@@ -463,14 +523,14 @@ describe('dependency cache', () => {
 });
 
 function resetState() {
-  jest.spyOn(core, 'getState').mockReset();
+  (core.getState as jest.Mock).mockReset();
 }
 
 /**
  * Create states to emulate a restore process without build file.
  */
 function createStateForMissingBuildFile() {
-  jest.spyOn(core, 'getState').mockImplementation(name => {
+  (core.getState as jest.Mock<any>).mockImplementation((name: any) => {
     switch (name) {
       case 'cache-primary-key':
         return 'setup-java-cache-';
@@ -484,7 +544,7 @@ function createStateForMissingBuildFile() {
  * Create states to emulate a successful restore process.
  */
 function createStateForSuccessfulRestore() {
-  jest.spyOn(core, 'getState').mockImplementation(name => {
+  (core.getState as jest.Mock<any>).mockImplementation((name: any) => {
     switch (name) {
       case 'cache-primary-key':
         return 'setup-java-cache-primary-key';

__tests__/cleanup-java.test.ts

@@ -1,32 +1,87 @@
-import {run as cleanup} from '../src/cleanup-java';
+import {
-import * as core from '@actions/core';
+  jest,
-import * as cache from '@actions/cache';
+  describe,
-import * as util from '../src/util';
+  it,
+  expect,
+  beforeEach,
+  afterEach,
+  beforeAll,
+  afterAll
+} from '@jest/globals';
+
+// Mock @actions/cache before importing source modules
+const real_cache_module = await import('@actions/cache');
+jest.unstable_mockModule('@actions/cache', () => ({
+  ...real_cache_module,
+  saveCache: jest.fn(),
+  restoreCache: jest.fn()
+}));
+
+// Mock @actions/core before importing source modules that depend on it
+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)
+}));
+
+const real_util_module = await import('../src/util.js');
+jest.unstable_mockModule('../src/util.js', () => ({
+  ...real_util_module,
+  extractJdkFile: jest.fn(),
+  getDownloadArchiveExtension: jest.fn(),
+  getToolcachePath: jest.fn(),
+  isJobStatusSuccess: jest.fn(),
+  renameWinArchive: jest.fn(),
+  isVersionSatisfies: real_util_module.isVersionSatisfies,
+  getTempDir: real_util_module.getTempDir
+}));
+
+// Dynamic imports after mocking
+const core = await import('@actions/core');
+const cache = await import('@actions/cache');
+const {run: cleanup} = await import('../src/cleanup-java.js');
+const util = await import('../src/util.js');
 
 describe('cleanup', () => {
-  let spyWarning: jest.SpyInstance<void, Parameters<typeof core.warning>>;
+  let spyWarning: any;
-  let spyInfo: jest.SpyInstance<void, Parameters<typeof core.info>>;
+  let spyInfo: any;
-  let spyCacheSave: jest.SpyInstance<
+  let spyCacheSave: any;
-    ReturnType<typeof cache.saveCache>,
+  let spyJobStatusSuccess: any;
-    Parameters<typeof cache.saveCache>
+  let spyCoreError: any;
-  >;
-  let spyJobStatusSuccess: jest.SpyInstance;
-  let spyCoreError: jest.SpyInstance;
 
   beforeEach(() => {
-    spyWarning = jest.spyOn(core, 'warning');
+    spyWarning = core.warning as jest.Mock;
     spyWarning.mockImplementation(() => null);
 
-    spyInfo = jest.spyOn(core, 'info');
+    spyInfo = core.info as jest.Mock;
     spyInfo.mockImplementation(() => null);
 
-    spyCacheSave = jest.spyOn(cache, 'saveCache');
+    spyCacheSave = cache.saveCache as jest.Mock;
 
-    spyJobStatusSuccess = jest.spyOn(util, 'isJobStatusSuccess');
+    spyJobStatusSuccess = util.isJobStatusSuccess as jest.Mock;
     spyJobStatusSuccess.mockReturnValue(true);
 
     // Mock core.error to suppress error logs
-    spyCoreError = jest.spyOn(core, 'error');
+    spyCoreError = core.error as jest.Mock;
     spyCoreError.mockImplementation(() => {});
 
     createStateForSuccessfulRestore();
@@ -47,7 +102,7 @@ describe('cleanup', () => {
         )
       )
     );
-    jest.spyOn(core, 'getInput').mockImplementation((name: string) => {
+    (core.getInput as jest.Mock<any>).mockImplementation((name: string) => {
       return name === 'cache' ? 'gradle' : '';
     });
     await cleanup();
@@ -59,7 +114,7 @@ describe('cleanup', () => {
     spyCacheSave.mockImplementation((paths: string[], key: string) =>
       Promise.reject(new Error('Unexpected error'))
     );
-    jest.spyOn(core, 'getInput').mockImplementation((name: string) => {
+    (core.getInput as jest.Mock<any>).mockImplementation((name: string) => {
       return name === 'cache' ? 'gradle' : '';
     });
     await cleanup();
@@ -68,14 +123,14 @@ describe('cleanup', () => {
 });
 
 function resetState() {
-  jest.spyOn(core, 'getState').mockReset();
+  (core.getState as jest.Mock).mockReset();
 }
 
 /**
  * Create states to emulate a successful restore process.
  */
 function createStateForSuccessfulRestore() {
-  jest.spyOn(core, 'getState').mockImplementation(name => {
+  (core.getState as jest.Mock<any>).mockImplementation((name: any) => {
     switch (name) {
       case 'cache-primary-key':
         return 'setup-java-cache-primary-key';

__tests__/distributors/adopt-installer.test.ts

@@ -1,21 +1,59 @@
-import {HttpClient} from '@actions/http-client';
-import {IAdoptAvailableVersions} from '../../src/distributions/adopt/models';
 import {
-  AdoptDistribution,
+  jest,
-  AdoptImplementation
+  describe,
-} from '../../src/distributions/adopt/installer';
+  it,
-import {TemurinDistribution} from '../../src/distributions/temurin/installer';
+  expect,
-import {JavaInstallerOptions} from '../../src/distributions/base-models';
+  beforeEach,
-
+  afterEach,
+  beforeAll,
+  afterAll
+} from '@jest/globals';
+import {HttpClient} from '@actions/http-client';
 import os from 'os';
 
-import manifestData from '../data/adopt.json';
+import manifestData from '../data/adopt.json' with {type: 'json'};
-import * as core from '@actions/core';
+
+// Mock @actions/core before importing source modules that depend on it
+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)
+}));
+
+// Dynamic imports after mocking
+const core = await import('@actions/core');
+const {AdoptDistribution, AdoptImplementation} =
+  await import('../../src/distributions/adopt/installer.js');
+const {TemurinDistribution} =
+  await import('../../src/distributions/temurin/installer.js');
+
+import type {IAdoptAvailableVersions} from '../../src/distributions/adopt/models.js';
+import type {AdoptImplementation as AdoptImplementationType} from '../../src/distributions/adopt/installer.js';
+import type {JavaInstallerOptions} from '../../src/distributions/base-models.js';
 
 describe('getAvailableVersions', () => {
-  let spyHttpClient: jest.SpyInstance;
+  let spyHttpClient: any;
-  let spyCoreError: jest.SpyInstance;
+  let spyCoreError: any;
-  let spyCoreWarning: jest.SpyInstance;
+  let spyCoreWarning: any;
 
   beforeEach(() => {
     spyHttpClient = jest.spyOn(HttpClient.prototype, 'getJson');
@@ -26,9 +64,9 @@ describe('getAvailableVersions', () => {
     });
 
     // Mock core.error to suppress error logs
-    spyCoreError = jest.spyOn(core, 'error');
+    spyCoreError = core.error as jest.Mock;
     spyCoreError.mockImplementation(() => {});
-    spyCoreWarning = jest.spyOn(core, 'warning');
+    spyCoreWarning = core.warning as jest.Mock;
     spyCoreWarning.mockImplementation(() => {});
   });
 
@@ -123,7 +161,7 @@ describe('getAvailableVersions', () => {
     'build correct url for %s',
     async (
       installerOptions: JavaInstallerOptions,
-      impl: AdoptImplementation,
+      impl: AdoptImplementationType,
       expectedParameters
     ) => {
       const distribution = new AdoptDistribution(installerOptions, impl);
@@ -204,7 +242,7 @@ describe('getAvailableVersions', () => {
     [AdoptImplementation.OpenJ9, 'jre', 'Java_Adopt-OpenJ9_jre']
   ])(
     'find right toolchain folder',
-    (impl: AdoptImplementation, packageType: string, expected: string) => {
+    (impl: AdoptImplementationType, packageType: string, expected: string) => {
       const distribution = new AdoptDistribution(
         {
           version: '11',
@@ -263,11 +301,11 @@ describe('findPackageForDownload', () => {
       url: 'https://example.test/temurin-11.tar.gz'
     };
     const temurinFindPackageForDownload = jest
-      .fn()
+      .fn<any>()
       .mockResolvedValue(temurinRelease);
     const temurinDistribution = {
       findPackageForDownload: temurinFindPackageForDownload
-    } as unknown as TemurinDistribution;
+    } as any;
 
     const distribution = new AdoptDistribution(
       {
@@ -279,7 +317,7 @@ describe('findPackageForDownload', () => {
       AdoptImplementation.Hotspot,
       temurinDistribution
     );
-    const adoptLookupSpy = jest.fn();
+    const adoptLookupSpy = jest.fn<any>();
     distribution['getAvailableVersions'] = adoptLookupSpy;
 
     const resolvedVersion = await distribution['findPackageForDownload']('11');

__tests__/distributors/base-installer.test.ts

@@ -1,19 +1,90 @@
-import * as tc from '@actions/tool-cache';
+import {
-import * as core from '@actions/core';
+  jest,
-import * as util from '../../src/util';
+  describe,
+  it,
+  expect,
+  beforeEach,
+  afterEach,
+  beforeAll,
+  afterAll
+} from '@jest/globals';
+import type {
+  JavaDownloadRelease,
+  JavaInstallerOptions,
+  JavaInstallerResults
+} from '../../src/distributions/base-models.js';
 
 import path from 'path';
 import * as semver from 'semver';
 
-import {JavaBase} from '../../src/distributions/base-installer';
-import {
-  JavaDownloadRelease,
-  JavaInstallerOptions,
-  JavaInstallerResults
-} from '../../src/distributions/base-models';
-
 import os from 'os';
 
+// Mock @actions/core before importing source modules that depend on it
+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/tool-cache', () => ({
+  find: jest.fn(),
+  findAllVersions: jest.fn(),
+  downloadTool: jest.fn(),
+  extractZip: jest.fn(),
+  extractTar: jest.fn(),
+  extract7z: jest.fn(),
+  extractXar: jest.fn(),
+  cacheDir: jest.fn(),
+  cacheFile: jest.fn(),
+  getManifestFromRepo: jest.fn(),
+  findFromManifest: jest.fn(),
+  evaluateVersions: jest.fn(),
+  HTTPError: class HTTPError extends Error {
+    httpStatusCode: number;
+    constructor(statusCode: number) {
+      super(`HTTP Error: ${statusCode}`);
+      this.httpStatusCode = statusCode;
+    }
+  }
+}));
+
+const real_util_module = await import('../../src/util.js');
+jest.unstable_mockModule('../../src/util.js', () => ({
+  ...real_util_module,
+  extractJdkFile: jest.fn(),
+  getDownloadArchiveExtension: jest.fn(),
+  getToolcachePath: jest.fn(),
+  isJobStatusSuccess: jest.fn(),
+  renameWinArchive: jest.fn(),
+  isVersionSatisfies: real_util_module.isVersionSatisfies,
+  getTempDir: real_util_module.getTempDir
+}));
+
+// Dynamic imports after mocking
+const core = await import('@actions/core');
+const tc = await import('@actions/tool-cache');
+const util = await import('../../src/util.js');
+const {JavaBase} = await import('../../src/distributions/base-installer.js');
+
 class EmptyJavaBase extends JavaBase {
   constructor(installerOptions: JavaInstallerOptions) {
     super('Empty', installerOptions);
@@ -53,12 +124,12 @@ describe('findInToolcache', () => {
   const javaPath = path.join('Java_Empty_jdk', actualJavaVersion, 'x64');
 
   let mockJavaBase: EmptyJavaBase;
-  let spyGetToolcachePath: jest.SpyInstance;
+  let spyGetToolcachePath: any;
-  let spyTcFindAllVersions: jest.SpyInstance;
+  let spyTcFindAllVersions: any;
 
   beforeEach(() => {
-    spyGetToolcachePath = jest.spyOn(util, 'getToolcachePath');
+    spyGetToolcachePath = util.getToolcachePath as jest.Mock;
-    spyTcFindAllVersions = jest.spyOn(tc, 'findAllVersions');
+    spyTcFindAllVersions = tc.findAllVersions as jest.Mock;
   });
 
   afterEach(() => {
@@ -241,17 +312,17 @@ describe('setupJava', () => {
 
   let mockJavaBase: EmptyJavaBase;
 
-  let spyGetToolcachePath: jest.SpyInstance;
+  let spyGetToolcachePath: any;
-  let spyTcFindAllVersions: jest.SpyInstance;
+  let spyTcFindAllVersions: any;
-  let spyCoreDebug: jest.SpyInstance;
+  let spyCoreDebug: any;
-  let spyCoreInfo: jest.SpyInstance;
+  let spyCoreInfo: any;
-  let spyCoreExportVariable: jest.SpyInstance;
+  let spyCoreExportVariable: any;
-  let spyCoreAddPath: jest.SpyInstance;
+  let spyCoreAddPath: any;
-  let spyCoreSetOutput: jest.SpyInstance;
+  let spyCoreSetOutput: any;
-  let spyCoreError: jest.SpyInstance;
+  let spyCoreError: any;
 
   beforeEach(() => {
-    spyGetToolcachePath = jest.spyOn(util, 'getToolcachePath');
+    spyGetToolcachePath = util.getToolcachePath as jest.Mock;
     spyGetToolcachePath.mockImplementation(
       (toolname: string, javaVersion: string, architecture: string) => {
         const semverVersion = new semver.Range(javaVersion);
@@ -269,27 +340,27 @@ describe('setupJava', () => {
       }
     );
 
-    spyTcFindAllVersions = jest.spyOn(tc, 'findAllVersions');
+    spyTcFindAllVersions = tc.findAllVersions as jest.Mock;
     spyTcFindAllVersions.mockReturnValue([installedJavaVersion]);
 
     // Spy on core methods
-    spyCoreDebug = jest.spyOn(core, 'debug');
+    spyCoreDebug = core.debug as jest.Mock;
     spyCoreDebug.mockImplementation(() => undefined);
 
-    spyCoreInfo = jest.spyOn(core, 'info');
+    spyCoreInfo = core.info as jest.Mock;
     spyCoreInfo.mockImplementation(() => undefined);
 
-    spyCoreAddPath = jest.spyOn(core, 'addPath');
+    spyCoreAddPath = core.addPath as jest.Mock;
     spyCoreAddPath.mockImplementation(() => undefined);
 
-    spyCoreExportVariable = jest.spyOn(core, 'exportVariable');
+    spyCoreExportVariable = core.exportVariable as jest.Mock;
     spyCoreExportVariable.mockImplementation(() => undefined);
 
-    spyCoreSetOutput = jest.spyOn(core, 'setOutput');
+    spyCoreSetOutput = core.setOutput as jest.Mock;
     spyCoreSetOutput.mockImplementation(() => undefined);
 
     // Mock core.error to suppress error logs
-    spyCoreError = jest.spyOn(core, 'error');
+    spyCoreError = core.error as jest.Mock;
     spyCoreError.mockImplementation(() => undefined);
 
     jest.spyOn(os, 'arch').mockReturnValue('x86' as ReturnType<typeof os.arch>);

__tests__/distributors/corretto-installer.test.ts

@@ -1,17 +1,62 @@
+import {
+  jest,
+  describe,
+  it,
+  expect,
+  beforeEach,
+  afterEach,
+  beforeAll,
+  afterAll
+} from '@jest/globals';
+import type {JavaInstallerOptions} from '../../src/distributions/base-models.js';
 import {HttpClient} from '@actions/http-client';
-import {JavaInstallerOptions} from '../../src/distributions/base-models';
 
-import {CorrettoDistribution} from '../../src/distributions/corretto/installer';
-import * as util from '../../src/util';
 import os from 'os';
-import * as core from '@actions/core';
 
-import manifestData from '../data/corretto.json';
+import manifestData from '../data/corretto.json' with {type: 'json'};
+
+// Mock @actions/core before importing source modules that depend on it
+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)
+}));
+
+const real_util_module = await import('../../src/util.js');
+jest.unstable_mockModule('../../src/util.js', () => ({
+  ...real_util_module,
+  getDownloadArchiveExtension: jest.fn()
+}));
+
+// Dynamic imports after mocking
+const core = await import('@actions/core');
+const {CorrettoDistribution} =
+  await import('../../src/distributions/corretto/installer.js');
+const util = await import('../../src/util.js');
 
 describe('getAvailableVersions', () => {
-  let spyHttpClient: jest.SpyInstance;
+  let spyHttpClient: ReturnType<typeof jest.spyOn>;
-  let spyGetDownloadArchiveExtension: jest.SpyInstance;
+  let spyGetDownloadArchiveExtension: any;
-  let spyCoreError: jest.SpyInstance;
+  let spyCoreError: any;
 
   beforeEach(() => {
     spyHttpClient = jest.spyOn(HttpClient.prototype, 'getJson');
@@ -20,13 +65,11 @@ describe('getAvailableVersions', () => {
       headers: {},
       result: manifestData
     });
-    spyGetDownloadArchiveExtension = jest.spyOn(
+    spyGetDownloadArchiveExtension =
-      util,
+      util.getDownloadArchiveExtension as jest.Mock;
-      'getDownloadArchiveExtension'
-    );
 
     // Mock core.error to suppress error logs
-    spyCoreError = jest.spyOn(core, 'error');
+    spyCoreError = core.error as jest.Mock;
     spyCoreError.mockImplementation(() => {});
   });
 
@@ -235,7 +278,7 @@ describe('getAvailableVersions', () => {
   });
 
   const mockPlatform = (
-    distribution: CorrettoDistribution,
+    distribution: InstanceType<typeof CorrettoDistribution>,
     platform: string
   ) => {
     distribution['getPlatformOption'] = () => platform;

__tests__/distributors/dragonwell-installer.test.ts

@@ -1,14 +1,59 @@
+import {
+  jest,
+  describe,
+  it,
+  expect,
+  beforeEach,
+  afterEach,
+  beforeAll,
+  afterAll
+} from '@jest/globals';
 import {HttpClient} from '@actions/http-client';
-import {DragonwellDistribution} from '../../src/distributions/dragonwell/installer';
-import * as utils from '../../src/util';
-import * as core from '@actions/core';
 
-import manifestData from '../data/dragonwell.json';
+import manifestData from '../data/dragonwell.json' with {type: 'json'};
+
+// Mock @actions/core before importing source modules that depend on it
+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)
+}));
+
+const real_util_module = await import('../../src/util.js');
+jest.unstable_mockModule('../../src/util.js', () => ({
+  ...real_util_module,
+  getDownloadArchiveExtension: jest.fn()
+}));
+
+// Dynamic imports after mocking
+const core = await import('@actions/core');
+const {DragonwellDistribution} =
+  await import('../../src/distributions/dragonwell/installer.js');
+const utils = await import('../../src/util.js');
 
 describe('getAvailableVersions', () => {
-  let spyHttpClient: jest.SpyInstance;
+  let spyHttpClient: any;
-  let spyUtilGetDownloadArchiveExtension: jest.SpyInstance;
+  let spyUtilGetDownloadArchiveExtension: any;
-  let spyCoreError: jest.SpyInstance;
+  let spyCoreError: any;
 
   beforeEach(() => {
     spyHttpClient = jest.spyOn(HttpClient.prototype, 'getJson');
@@ -18,14 +63,12 @@ describe('getAvailableVersions', () => {
       result: manifestData
     });
 
-    spyUtilGetDownloadArchiveExtension = jest.spyOn(
+    spyUtilGetDownloadArchiveExtension =
-      utils,
+      utils.getDownloadArchiveExtension as jest.Mock;
-      'getDownloadArchiveExtension'
-    );
     spyUtilGetDownloadArchiveExtension.mockReturnValue('tar.gz');
 
     // Mock core.error to suppress error logs
-    spyCoreError = jest.spyOn(core, 'error');
+    spyCoreError = core.error as jest.Mock;
     spyCoreError.mockImplementation(() => {});
   });
 
@@ -36,7 +79,7 @@ describe('getAvailableVersions', () => {
   });
 
   const mockPlatform = (
-    distribution: DragonwellDistribution,
+    distribution: InstanceType<typeof DragonwellDistribution>,
     platform: string
   ) => {
     distribution['getPlatformOption'] = () => platform;

__tests__/distributors/graalvm-installer.test.ts

@@ -1,53 +1,116 @@
-import * as core from '@actions/core';
-import * as tc from '@actions/tool-cache';
-import * as http from '@actions/http-client';
-import fs from 'fs';
-import path from 'path';
 import {
-  GraalVMCommunityDistribution,
+  jest,
-  GraalVMDistribution
+  describe,
-} from '../../src/distributions/graalvm/installer';
+  it,
-import {getJavaDistribution} from '../../src/distributions/distribution-factory';
+  expect,
-import {JavaInstallerOptions} from '../../src/distributions/base-models';
+  beforeEach,
-import * as util from '../../src/util';
+  beforeAll,
+  afterAll
+} from '@jest/globals';
+import path from 'path';
 
-jest.mock('@actions/core');
+// Mock @actions modules
-jest.mock('@actions/tool-cache');
+jest.unstable_mockModule('@actions/core', () => ({
-jest.mock('@actions/http-client');
+  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.mock('../../src/util', () => ({
+jest.unstable_mockModule('@actions/tool-cache', () => ({
-  ...jest.requireActual('../../src/util'),
+  find: jest.fn(),
+  findAllVersions: jest.fn(),
+  downloadTool: jest.fn(),
+  extractZip: jest.fn(),
+  extractTar: jest.fn(),
+  extract7z: jest.fn(),
+  extractXar: jest.fn(),
+  cacheDir: jest.fn(),
+  cacheFile: jest.fn(),
+  getManifestFromRepo: jest.fn(),
+  findFromManifest: jest.fn(),
+  evaluateVersions: jest.fn()
+}));
+
+jest.unstable_mockModule('@actions/http-client', () => ({
+  HttpClient: jest.fn().mockImplementation(() => ({
+    getJson: jest.fn(),
+    head: jest.fn(),
+    get: jest.fn()
+  })),
+  HttpClientError: class HttpClientError extends Error {
+    statusCode: number;
+    constructor(message: string, statusCode: number) {
+      super(message);
+      this.statusCode = statusCode;
+    }
+  },
+  HttpCodes: {OK: 200, NotFound: 404, Unauthorized: 401, Forbidden: 403}
+}));
+
+// Get real util first, then mock specific functions
+const realUtil = await import('../../src/util.js');
+jest.unstable_mockModule('../../src/util.js', () => ({
+  ...realUtil,
   extractJdkFile: jest.fn(),
   getDownloadArchiveExtension: jest.fn(),
   renameWinArchive: jest.fn(),
   getGitHubHttpHeaders: jest.fn().mockReturnValue({Accept: 'application/json'})
 }));
 
-jest.mock('fs', () => ({
+const real_fs_module = await import('fs');
-  ...jest.requireActual('fs'),
+jest.unstable_mockModule('fs', () => ({
+  ...real_fs_module,
+  default: {
+    ...real_fs_module.default,
+    readdirSync: jest.fn(),
+    existsSync: jest.fn()
+  },
   readdirSync: jest.fn(),
   existsSync: jest.fn()
 }));
 
+// Dynamic imports after mocking
+const core = await import('@actions/core');
+const tc = await import('@actions/tool-cache');
+const http = await import('@actions/http-client');
+const fs = (await import('fs')).default;
+const util = await import('../../src/util.js');
+const {GraalVMCommunityDistribution, GraalVMDistribution} =
+  await import('../../src/distributions/graalvm/installer.js');
+const {getJavaDistribution} =
+  await import('../../src/distributions/distribution-factory.js');
+
+import type {JavaInstallerOptions} from '../../src/distributions/base-models.js';
+
 beforeAll(() => {
   process.env.NODE_ENV = 'test';
-
-  if (!jest.isMockFunction(http.HttpClient)) {
-    throw new Error('HTTP client must be mocked in tests!');
-  }
-
-  if (!jest.isMockFunction(tc.downloadTool)) {
-    throw new Error('Tool cache downloadTool must be mocked in tests!');
-  }
-
   console.log('✅ All external dependencies are properly mocked');
 });
 
 describe('GraalVMDistribution', () => {
-  let distribution: GraalVMDistribution;
+  let distribution: InstanceType<typeof GraalVMDistribution>;
-  let communityDistribution: GraalVMCommunityDistribution;
+  let communityDistribution: InstanceType<typeof GraalVMCommunityDistribution>;
-  let mockHttpClient: jest.Mocked<http.HttpClient>;
+  let mockHttpClient: any;
-  let spyCoreError: jest.SpyInstance;
+  let spyCoreError: any;
 
   const defaultOptions: JavaInstallerOptions = {
     version: '17',
@@ -62,23 +125,20 @@ describe('GraalVMDistribution', () => {
     distribution = new GraalVMDistribution(defaultOptions);
     communityDistribution = new GraalVMCommunityDistribution(defaultOptions);
 
-    mockHttpClient = new http.HttpClient() as jest.Mocked<http.HttpClient>;
+    mockHttpClient = new (http.HttpClient as any)();
     (distribution as any).http = mockHttpClient;
     (communityDistribution as any).http = mockHttpClient;
 
-    (util.getDownloadArchiveExtension as jest.Mock).mockReturnValue('tar.gz');
+    (util.getDownloadArchiveExtension as jest.Mock<any>).mockReturnValue(
+      'tar.gz'
+    );
 
     // Mock core.error to suppress error logs
-    spyCoreError = jest.spyOn(core, 'error');
+    spyCoreError = core.error as jest.Mock;
     spyCoreError.mockImplementation(() => {});
   });
 
   afterAll(() => {
-    expect(jest.isMockFunction(http.HttpClient)).toBe(true);
-
-    expect(jest.isMockFunction(tc.downloadTool)).toBe(true);
-    expect(jest.isMockFunction(tc.cacheDir)).toBe(true);
-
     jest.restoreAllMocks();
     jest.clearAllMocks();
   });
@@ -113,20 +173,24 @@ describe('GraalVMDistribution', () => {
     };
 
     beforeEach(() => {
-      (tc.downloadTool as jest.Mock).mockResolvedValue('/tmp/archive.tar.gz');
+      (tc.downloadTool as any).mockResolvedValue('/tmp/archive.tar.gz');
-      (tc.cacheDir as jest.Mock).mockResolvedValue('/cached/java/path');
+      (tc.cacheDir as any).mockResolvedValue('/cached/java/path');
 
-      (util.extractJdkFile as jest.Mock).mockResolvedValue('/tmp/extracted');
+      (util.extractJdkFile as any).mockResolvedValue('/tmp/extracted');
 
       // Mock renameWinArchive - it returns the same path (no renaming)
-      (util.renameWinArchive as jest.Mock).mockImplementation((p: string) => p);
+      (util.renameWinArchive as any).mockImplementation((p: string) => p);
 
-      (util.getDownloadArchiveExtension as jest.Mock).mockReturnValue('tar.gz');
+      (util.getDownloadArchiveExtension as jest.Mock<any>).mockReturnValue(
+        'tar.gz'
+      );
 
       // Mock fs.existsSync to return true for extracted path
-      (fs.existsSync as jest.Mock).mockReturnValue(true);
+      (fs.existsSync as jest.Mock<any>).mockReturnValue(true);
 
-      (fs.readdirSync as jest.Mock).mockReturnValue(['graalvm-jdk-17.0.5']);
+      (fs.readdirSync as jest.Mock<any>).mockReturnValue([
+        'graalvm-jdk-17.0.5'
+      ]);
 
       jest
         .spyOn(distribution as any, 'getToolcacheVersionName')
@@ -173,7 +237,7 @@ describe('GraalVMDistribution', () => {
     });
 
     it('should throw error when extracted path does not exist', async () => {
-      (fs.existsSync as jest.Mock).mockReturnValue(false);
+      (fs.existsSync as jest.Mock<any>).mockReturnValue(false);
 
       await expect(
         (distribution as any).downloadTool(javaRelease)
@@ -187,8 +251,8 @@ describe('GraalVMDistribution', () => {
     });
 
     it('should throw error when extracted directory is empty', async () => {
-      (fs.existsSync as jest.Mock).mockReturnValue(true);
+      (fs.existsSync as jest.Mock<any>).mockReturnValue(true);
-      (fs.readdirSync as jest.Mock).mockReturnValue([]);
+      (fs.readdirSync as jest.Mock<any>).mockReturnValue([]);
 
       await expect(
         (distribution as any).downloadTool(javaRelease)
@@ -203,7 +267,7 @@ describe('GraalVMDistribution', () => {
 
     it('should handle download errors', async () => {
       const downloadError = new Error('Network error during download');
-      (tc.downloadTool as jest.Mock).mockRejectedValue(downloadError);
+      (tc.downloadTool as any).mockRejectedValue(downloadError);
 
       await expect(
         (distribution as any).downloadTool(javaRelease)
@@ -216,7 +280,7 @@ describe('GraalVMDistribution', () => {
 
     it('should handle extraction errors', async () => {
       const extractError = new Error('Failed to extract archive');
-      (util.extractJdkFile as jest.Mock).mockRejectedValue(extractError);
+      (util.extractJdkFile as any).mockRejectedValue(extractError);
 
       await expect(
         (distribution as any).downloadTool(javaRelease)
@@ -229,8 +293,10 @@ describe('GraalVMDistribution', () => {
 
     it('should handle different archive extensions', async () => {
       // Test with a .zip file
-      (util.getDownloadArchiveExtension as jest.Mock).mockReturnValue('zip');
+      (util.getDownloadArchiveExtension as jest.Mock<any>).mockReturnValue(
-      (tc.downloadTool as jest.Mock).mockResolvedValue('/tmp/archive.zip');
+        'zip'
+      );
+      (tc.downloadTool as any).mockResolvedValue('/tmp/archive.zip');
 
       const zipRelease = {
         version: '17.0.5',
@@ -309,7 +375,7 @@ describe('GraalVMDistribution', () => {
       it('should construct correct URL for specific version', async () => {
         const mockResponse = {
           message: {statusCode: 200}
-        } as http.HttpClientResponse;
+        } as any;
         mockHttpClient.head.mockResolvedValue(mockResponse);
 
         const result = await (distribution as any).findPackageForDownload(
@@ -326,7 +392,7 @@ describe('GraalVMDistribution', () => {
       it('should construct correct URL for major version (latest)', async () => {
         const mockResponse = {
           message: {statusCode: 200}
-        } as http.HttpClientResponse;
+        } as any;
         mockHttpClient.head.mockResolvedValue(mockResponse);
 
         const result = await (distribution as any).findPackageForDownload('21');
@@ -374,7 +440,7 @@ describe('GraalVMDistribution', () => {
       it('should throw error when file not found (404)', async () => {
         const mockResponse = {
           message: {statusCode: 404}
-        } as http.HttpClientResponse;
+        } as any;
         mockHttpClient.head.mockResolvedValue(mockResponse);
 
         // Verify the error is thrown with the expected message
@@ -395,7 +461,7 @@ describe('GraalVMDistribution', () => {
       it('should throw error for unauthorized access (401)', async () => {
         const mockResponse = {
           message: {statusCode: 401}
-        } as http.HttpClientResponse;
+        } as any;
         mockHttpClient.head.mockResolvedValue(mockResponse);
 
         await expect(
@@ -408,7 +474,7 @@ describe('GraalVMDistribution', () => {
       it('should throw error for forbidden access (403)', async () => {
         const mockResponse = {
           message: {statusCode: 403}
-        } as http.HttpClientResponse;
+        } as any;
         mockHttpClient.head.mockResolvedValue(mockResponse);
 
         await expect(
@@ -424,7 +490,7 @@ describe('GraalVMDistribution', () => {
             statusCode: 500,
             statusMessage: 'Internal Server Error'
           }
-        } as http.HttpClientResponse;
+        } as any;
         mockHttpClient.head.mockResolvedValue(mockResponse);
 
         await expect(
@@ -437,7 +503,7 @@ describe('GraalVMDistribution', () => {
       it('should throw error for other HTTP errors without status message', async () => {
         const mockResponse = {
           message: {statusCode: 500}
-        } as http.HttpClientResponse;
+        } as any;
         mockHttpClient.head.mockResolvedValue(mockResponse);
 
         await expect(
@@ -713,7 +779,7 @@ describe('GraalVMDistribution', () => {
       }
     ];
 
-    let fetchEASpy: jest.SpyInstance;
+    let fetchEASpy: any;
 
     beforeEach(() => {
       fetchEASpy = jest.spyOn(distribution as any, 'fetchEAJson');
@@ -932,7 +998,7 @@ describe('GraalVMDistribution', () => {
 
         const mockResponse = {
           message: {statusCode: 200}
-        } as http.HttpClientResponse;
+        } as any;
         mockHttpClient.head.mockResolvedValue(mockResponse);
 
         const result = await (distribution as any).findPackageForDownload('17');
@@ -960,7 +1026,7 @@ describe('GraalVMDistribution', () => {
 
         const mockResponse = {
           message: {statusCode: 200}
-        } as http.HttpClientResponse;
+        } as any;
         mockHttpClient.head.mockResolvedValue(mockResponse);
 
         const result = await (distribution as any).findPackageForDownload('17');

__tests__/distributors/jetbrains-installer.test.ts

@@ -1,14 +1,53 @@
+import {
+  jest,
+  describe,
+  it,
+  expect,
+  beforeEach,
+  afterEach,
+  beforeAll,
+  afterAll
+} from '@jest/globals';
 import https from 'https';
 import {HttpClient} from '@actions/http-client';
-import {JetBrainsDistribution} from '../../src/distributions/jetbrains/installer';
 
-import manifestData from '../data/jetbrains.json';
+import manifestData from '../data/jetbrains.json' with {type: 'json'};
 import os from 'os';
-import * as core from '@actions/core';
+
+// Mock @actions/core before importing source modules that depend on it
+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)
+}));
+
+// Dynamic imports after mocking
+const core = await import('@actions/core');
+const {JetBrainsDistribution} =
+  await import('../../src/distributions/jetbrains/installer.js');
 
 describe('getAvailableVersions', () => {
-  let spyHttpClient: jest.SpyInstance;
+  let spyHttpClient: any;
-  let spyCoreError: jest.SpyInstance;
+  let spyCoreError: any;
 
   beforeEach(() => {
     spyHttpClient = jest.spyOn(HttpClient.prototype, 'getJson');
@@ -19,7 +58,7 @@ describe('getAvailableVersions', () => {
     });
 
     // Mock core.error to suppress error logs
-    spyCoreError = jest.spyOn(core, 'error');
+    spyCoreError = core.error as jest.Mock;
     spyCoreError.mockImplementation(() => {});
   });
 
@@ -31,10 +70,16 @@ describe('getAvailableVersions', () => {
 
   it('load available versions', async () => {
     spyHttpClient = jest.spyOn(HttpClient.prototype, 'getJson');
-    spyHttpClient.mockReturnValueOnce({
+    spyHttpClient
+      .mockReturnValueOnce({
         statusCode: 200,
         headers: {},
         result: manifestData as any
+      })
+      .mockReturnValue({
+        statusCode: 200,
+        headers: {},
+        result: []
       });
 
     const distribution = new JetBrainsDistribution({

__tests__/distributors/kona-installer.test.ts

@@ -1,4 +1,4 @@
-import {KonaDistribution} from '../../src/distributions/kona/installer';
+import {KonaDistribution} from '../../src/distributions/kona/installer.js';
 
 import manifestData from '../data/kona.json';
 

__tests__/distributors/liberica-installer.test.ts

@@ -1,17 +1,56 @@
-import {LibericaDistributions} from '../../src/distributions/liberica/installer';
 import {
+  jest,
+  describe,
+  it,
+  expect,
+  beforeEach,
+  afterEach,
+  beforeAll,
+  afterAll
+} from '@jest/globals';
+import type {
   ArchitectureOptions,
   LibericaVersion
-} from '../../src/distributions/liberica/models';
+} from '../../src/distributions/liberica/models.js';
 import {HttpClient} from '@actions/http-client';
 import os from 'os';
-import * as core from '@actions/core';
 
-import manifestData from '../data/liberica.json';
+import manifestData from '../data/liberica.json' with {type: 'json'};
+
+// Mock @actions/core before importing source modules that depend on it
+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)
+}));
+
+// Dynamic imports after mocking
+const core = await import('@actions/core');
+const {LibericaDistributions} =
+  await import('../../src/distributions/liberica/installer.js');
 
 describe('getAvailableVersions', () => {
-  let spyHttpClient: jest.SpyInstance;
+  let spyHttpClient: any;
-  let spyCoreError: jest.SpyInstance;
+  let spyCoreError: any;
 
   beforeEach(() => {
     spyHttpClient = jest.spyOn(HttpClient.prototype, 'getJson');
@@ -22,7 +61,7 @@ describe('getAvailableVersions', () => {
     });
 
     // Mock core.error to suppress error logs
-    spyCoreError = jest.spyOn(core, 'error');
+    spyCoreError = core.error as jest.Mock;
     spyCoreError.mockImplementation(() => {});
   });
 
@@ -184,7 +223,7 @@ describe('getArchitectureOptions', () => {
 });
 
 describe('findPackageForDownload', () => {
-  let distribution: LibericaDistributions;
+  let distribution: InstanceType<typeof LibericaDistributions>;
 
   beforeEach(() => {
     distribution = new LibericaDistributions({

__tests__/distributors/liberica-linux-installer.test.ts

@@ -1,17 +1,56 @@
-import {LibericaDistributions} from '../../src/distributions/liberica/installer';
 import {
+  jest,
+  describe,
+  it,
+  expect,
+  beforeEach,
+  afterEach,
+  beforeAll,
+  afterAll
+} from '@jest/globals';
+import type {
   ArchitectureOptions,
   LibericaVersion
-} from '../../src/distributions/liberica/models';
+} from '../../src/distributions/liberica/models.js';
 import {HttpClient} from '@actions/http-client';
 import os from 'os';
-import * as core from '@actions/core';
 
-import manifestData from '../data/liberica-linux.json';
+import manifestData from '../data/liberica-linux.json' with {type: 'json'};
+
+// Mock @actions/core before importing source modules that depend on it
+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)
+}));
+
+// Dynamic imports after mocking
+const core = await import('@actions/core');
+const {LibericaDistributions} =
+  await import('../../src/distributions/liberica/installer.js');
 
 describe('getAvailableVersions', () => {
-  let spyHttpClient: jest.SpyInstance;
+  let spyHttpClient: any;
-  let spyCoreError: jest.SpyInstance;
+  let spyCoreError: any;
 
   beforeEach(() => {
     spyHttpClient = jest.spyOn(HttpClient.prototype, 'getJson');
@@ -22,7 +61,7 @@ describe('getAvailableVersions', () => {
     });
 
     // Mock core.error to suppress error logs
-    spyCoreError = jest.spyOn(core, 'error');
+    spyCoreError = core.error as jest.Mock;
     spyCoreError.mockImplementation(() => {});
   });
 
@@ -184,7 +223,7 @@ describe('getArchitectureOptions', () => {
 });
 
 describe('findPackageForDownload', () => {
-  let distribution: LibericaDistributions;
+  let distribution: InstanceType<typeof LibericaDistributions>;
 
   beforeEach(() => {
     distribution = new LibericaDistributions({

__tests__/distributors/liberica-windows-installer.test.ts

@@ -1,17 +1,56 @@
-import {LibericaDistributions} from '../../src/distributions/liberica/installer';
 import {
+  jest,
+  describe,
+  it,
+  expect,
+  beforeEach,
+  afterEach,
+  beforeAll,
+  afterAll
+} from '@jest/globals';
+import type {
   ArchitectureOptions,
   LibericaVersion
-} from '../../src/distributions/liberica/models';
+} from '../../src/distributions/liberica/models.js';
 import {HttpClient} from '@actions/http-client';
 import os from 'os';
-import * as core from '@actions/core';
 
-import manifestData from '../data/liberica-windows.json';
+import manifestData from '../data/liberica-windows.json' with {type: 'json'};
+
+// Mock @actions/core before importing source modules that depend on it
+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)
+}));
+
+// Dynamic imports after mocking
+const core = await import('@actions/core');
+const {LibericaDistributions} =
+  await import('../../src/distributions/liberica/installer.js');
 
 describe('getAvailableVersions', () => {
-  let spyHttpClient: jest.SpyInstance;
+  let spyHttpClient: any;
-  let spyCoreError: jest.SpyInstance;
+  let spyCoreError: any;
 
   beforeEach(() => {
     spyHttpClient = jest.spyOn(HttpClient.prototype, 'getJson');
@@ -21,7 +60,7 @@ describe('getAvailableVersions', () => {
       result: manifestData as LibericaVersion[]
     });
     // Mock core.error to suppress error logs
-    spyCoreError = jest.spyOn(core, 'error');
+    spyCoreError = core.error as jest.Mock;
     spyCoreError.mockImplementation(() => {});
   });
 
@@ -183,7 +222,7 @@ describe('getArchitectureOptions', () => {
 });
 
 describe('findPackageForDownload', () => {
-  let distribution: LibericaDistributions;
+  let distribution: InstanceType<typeof LibericaDistributions>;
 
   beforeEach(() => {
     distribution = new LibericaDistributions({

__tests__/distributors/local-installer.test.ts

@@ -1,37 +1,101 @@
+import {
+  jest,
+  describe,
+  it,
+  expect,
+  beforeEach,
+  afterEach,
+  beforeAll,
+  afterAll
+} from '@jest/globals';
 import fs from 'fs';
 
-import * as tc from '@actions/tool-cache';
-import * as core from '@actions/core';
-
 import path from 'path';
 import * as semver from 'semver';
-import * as util from '../../src/util';
 
-import {LocalDistribution} from '../../src/distributions/local/installer';
+// Mock @actions/core before importing source modules that depend on it
+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/tool-cache', () => ({
+  find: jest.fn(),
+  findAllVersions: jest.fn(),
+  downloadTool: jest.fn(),
+  extractZip: jest.fn(),
+  extractTar: jest.fn(),
+  extract7z: jest.fn(),
+  extractXar: jest.fn(),
+  cacheDir: jest.fn(),
+  cacheFile: jest.fn(),
+  getManifestFromRepo: jest.fn(),
+  findFromManifest: jest.fn(),
+  evaluateVersions: jest.fn()
+}));
+
+const real_util_module = await import('../../src/util.js');
+jest.unstable_mockModule('../../src/util.js', () => ({
+  ...real_util_module,
+  extractJdkFile: jest.fn(),
+  getDownloadArchiveExtension: jest.fn(),
+  getToolcachePath: jest.fn(),
+  isJobStatusSuccess: jest.fn(),
+  renameWinArchive: jest.fn(),
+  isVersionSatisfies: real_util_module.isVersionSatisfies,
+  getTempDir: real_util_module.getTempDir
+}));
+
+// Dynamic imports after mocking
+const core = await import('@actions/core');
+const tc = await import('@actions/tool-cache');
+const util = await import('../../src/util.js');
+const {LocalDistribution} =
+  await import('../../src/distributions/local/installer.js');
 
 describe('setupJava', () => {
   const actualJavaVersion = '11.1.10';
   const javaPath = path.join('Java_jdkfile_jdk', actualJavaVersion, 'x86');
 
-  let mockJavaBase: LocalDistribution;
+  let mockJavaBase: InstanceType<typeof LocalDistribution>;
 
-  let spyGetToolcachePath: jest.SpyInstance;
+  let spyGetToolcachePath: any;
-  let spyTcCacheDir: jest.SpyInstance;
+  let spyTcCacheDir: any;
-  let spyTcFindAllVersions: jest.SpyInstance;
+  let spyTcFindAllVersions: any;
-  let spyCoreDebug: jest.SpyInstance;
+  let spyCoreDebug: any;
-  let spyCoreInfo: jest.SpyInstance;
+  let spyCoreInfo: any;
-  let spyCoreExportVariable: jest.SpyInstance;
+  let spyCoreExportVariable: any;
-  let spyCoreAddPath: jest.SpyInstance;
+  let spyCoreAddPath: any;
-  let spyCoreSetOutput: jest.SpyInstance;
+  let spyCoreSetOutput: any;
-  let spyFsStat: jest.SpyInstance;
+  let spyFsStat: any;
-  let spyFsReadDir: jest.SpyInstance;
+  let spyFsReadDir: any;
-  let spyUtilsExtractJdkFile: jest.SpyInstance;
+  let spyUtilsExtractJdkFile: any;
-  let spyPathResolve: jest.SpyInstance;
+  let spyPathResolve: any;
-  let spyCoreError: jest.SpyInstance;
+  let spyCoreError: any;
   const expectedJdkFile = 'JavaLocalJdkFile';
 
   beforeEach(() => {
-    spyGetToolcachePath = jest.spyOn(util, 'getToolcachePath');
+    spyGetToolcachePath = util.getToolcachePath as jest.Mock;
     spyGetToolcachePath.mockImplementation(
       (toolname: string, javaVersion: string, architecture: string) => {
         const semverVersion = new semver.Range(javaVersion);
@@ -49,7 +113,7 @@ describe('setupJava', () => {
       }
     );
 
-    spyTcCacheDir = jest.spyOn(tc, 'cacheDir');
+    spyTcCacheDir = tc.cacheDir as jest.Mock;
     spyTcCacheDir.mockImplementation(
       (
         archivePath: string,
@@ -59,23 +123,23 @@ describe('setupJava', () => {
       ) => path.join(toolcacheFolderName, version, architecture)
     );
 
-    spyTcFindAllVersions = jest.spyOn(tc, 'findAllVersions');
+    spyTcFindAllVersions = tc.findAllVersions as jest.Mock;
     spyTcFindAllVersions.mockReturnValue([actualJavaVersion]);
 
     // Spy on core methods
-    spyCoreDebug = jest.spyOn(core, 'debug');
+    spyCoreDebug = core.debug as jest.Mock;
     spyCoreDebug.mockImplementation(() => undefined);
 
-    spyCoreInfo = jest.spyOn(core, 'info');
+    spyCoreInfo = core.info as jest.Mock;
     spyCoreInfo.mockImplementation(() => undefined);
 
-    spyCoreAddPath = jest.spyOn(core, 'addPath');
+    spyCoreAddPath = core.addPath as jest.Mock;
     spyCoreAddPath.mockImplementation(() => undefined);
 
-    spyCoreExportVariable = jest.spyOn(core, 'exportVariable');
+    spyCoreExportVariable = core.exportVariable as jest.Mock;
     spyCoreExportVariable.mockImplementation(() => undefined);
 
-    spyCoreSetOutput = jest.spyOn(core, 'setOutput');
+    spyCoreSetOutput = core.setOutput as jest.Mock;
     spyCoreSetOutput.mockImplementation(() => undefined);
 
     // Spy on fs methods
@@ -88,7 +152,7 @@ describe('setupJava', () => {
     });
 
     // Spy on util methods
-    spyUtilsExtractJdkFile = jest.spyOn(util, 'extractJdkFile');
+    spyUtilsExtractJdkFile = util.extractJdkFile as jest.Mock;
     spyUtilsExtractJdkFile.mockImplementation(() => 'some/random/path/');
 
     // Spy on path methods
@@ -96,7 +160,7 @@ describe('setupJava', () => {
     spyPathResolve.mockImplementation((path: string) => path);
 
     // Mock core.error to suppress error logs
-    spyCoreError = jest.spyOn(core, 'error');
+    spyCoreError = core.error as jest.Mock;
     spyCoreError.mockImplementation(() => {});
   });
 

__tests__/distributors/microsoft-installer.test.ts

@@ -1,23 +1,115 @@
 import {
-  MicrosoftDistributions,
+  jest,
-  MICROSOFT_PUBLIC_KEY
+  describe,
-} from '../../src/distributions/microsoft/installer';
+  it,
-import os from 'os';
+  expect,
-import data from '../data/microsoft.json';
+  beforeEach,
-import * as httpm from '@actions/http-client';
+  afterEach,
-import * as core from '@actions/core';
+  beforeAll,
-import * as tc from '@actions/tool-cache';
+  afterAll
-import * as gpg from '../../src/gpg';
+} from '@jest/globals';
-import * as util from '../../src/util';
+import {HttpClient} from '@actions/http-client';
-import fs from 'fs';
+import data from '../data/microsoft.json' with {type: 'json'};
+
+const mockOsArch = jest.fn(() => 'x64');
+const mockOsPlatform = jest.fn(() => 'linux');
+
+const real_os_module = await import('os');
+jest.unstable_mockModule('os', () => ({
+  ...real_os_module,
+  default: {
+    ...real_os_module.default,
+    arch: mockOsArch,
+    platform: mockOsPlatform,
+    homedir: real_os_module.default.homedir
+  },
+  arch: mockOsArch,
+  platform: mockOsPlatform
+}));
+
+const real_fs_module = await import('fs');
+const mockReaddirSync = jest.fn();
+jest.unstable_mockModule('fs', () => ({
+  ...real_fs_module,
+  default: {
+    ...real_fs_module.default,
+    readdirSync: mockReaddirSync
+  },
+  readdirSync: mockReaddirSync
+}));
+
+// Mock @actions/core before importing source modules that depend on it
+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)
+}));
+
+const real_tc_module = await import('@actions/tool-cache');
+jest.unstable_mockModule('@actions/tool-cache', () => ({
+  ...real_tc_module,
+  downloadTool: jest.fn(),
+  cacheDir: jest.fn(),
+  cacheFile: jest.fn()
+}));
+
+const real_util_module = await import('../../src/util.js');
+jest.unstable_mockModule('../../src/util.js', () => ({
+  ...real_util_module,
+  extractJdkFile: jest.fn(),
+  getDownloadArchiveExtension: jest.fn(),
+  getToolcachePath: jest.fn(),
+  isJobStatusSuccess: jest.fn(),
+  renameWinArchive: jest.fn(),
+  isVersionSatisfies: real_util_module.isVersionSatisfies,
+  getTempDir: real_util_module.getTempDir
+}));
+
+jest.unstable_mockModule('../../src/gpg.js', () => ({
+  importKey: jest.fn(),
+  deleteKey: jest.fn(),
+  verifyPackageSignature: jest.fn()
+}));
+
+// Dynamic imports after mocking
+const core = await import('@actions/core');
+const gpg = await import('../../src/gpg.js');
+const tc = await import('@actions/tool-cache');
+const os = (await import('os')).default;
+const fs = (await import('fs')).default;
+const {MicrosoftDistributions, MICROSOFT_PUBLIC_KEY} =
+  await import('../../src/distributions/microsoft/installer.js');
+const util = await import('../../src/util.js');
 
 describe('findPackageForDownload', () => {
-  let distribution: MicrosoftDistributions;
+  let distribution: InstanceType<typeof MicrosoftDistributions>;
-  let spyGetManifestFromRepo: jest.SpyInstance;
+  let spyGetManifestFromRepo: any;
-  let spyDebug: jest.SpyInstance;
+  let spyDebug: any;
-  let spyCoreError: jest.SpyInstance;
+  let spyCoreError: any;
 
   beforeEach(() => {
+    mockOsArch.mockReturnValue('x64');
+    mockOsPlatform.mockReturnValue(process.platform);
+
     distribution = new MicrosoftDistributions({
       version: '',
       architecture: 'x64',
@@ -25,18 +117,18 @@ describe('findPackageForDownload', () => {
       checkLatest: false
     });
 
-    spyGetManifestFromRepo = jest.spyOn(httpm.HttpClient.prototype, 'getJson');
+    spyGetManifestFromRepo = jest.spyOn(HttpClient.prototype, 'getJson');
     spyGetManifestFromRepo.mockReturnValue({
       result: data,
       statusCode: 200,
       headers: {}
     });
 
-    spyDebug = jest.spyOn(core, 'debug');
+    spyDebug = core.debug as jest.Mock;
     spyDebug.mockImplementation(() => {});
 
     // Mock core.error to suppress error logs
-    spyCoreError = jest.spyOn(core, 'error');
+    spyCoreError = core.error as jest.Mock;
     spyCoreError.mockImplementation(() => {});
   });
 
@@ -118,10 +210,8 @@ describe('findPackageForDownload', () => {
   ])(
     'defaults to os.arch(): %s mapped to distro arch: %s',
     async (osArch: string, distroArch: string) => {
-      jest
+      mockOsArch.mockReturnValue(osArch);
-        .spyOn(os, 'arch')
+      mockOsPlatform.mockReturnValue('darwin');
-        .mockReturnValue(osArch as ReturnType<typeof os.arch>);
-      jest.spyOn(os, 'platform').mockReturnValue('darwin');
 
       const version = '17';
       const distro = new MicrosoftDistributions({
@@ -144,10 +234,8 @@ describe('findPackageForDownload', () => {
   ])(
     'defaults to os.arch(): %s mapped to distro arch: %s',
     async (osArch: string, distroArch: string) => {
-      jest
+      mockOsArch.mockReturnValue(osArch);
-        .spyOn(os, 'arch')
+      mockOsPlatform.mockReturnValue('linux');
-        .mockReturnValue(osArch as ReturnType<typeof os.arch>);
-      jest.spyOn(os, 'platform').mockReturnValue('linux');
 
       const version = '17';
       const distro = new MicrosoftDistributions({
@@ -170,10 +258,8 @@ describe('findPackageForDownload', () => {
   ])(
     'defaults to os.arch(): %s mapped to distro arch: %s',
     async (osArch: string, distroArch: string) => {
-      jest
+      mockOsArch.mockReturnValue(osArch);
-        .spyOn(os, 'arch')
+      mockOsPlatform.mockReturnValue('win32');
-        .mockReturnValue(osArch as ReturnType<typeof os.arch>);
-      jest.spyOn(os, 'platform').mockReturnValue('win32');
 
       const version = '17';
       const distro = new MicrosoftDistributions({
@@ -217,7 +303,7 @@ describe('findPackageForDownload', () => {
       statusCode: 200,
       headers: {}
     });
-    jest.spyOn(os, 'platform').mockReturnValue('linux');
+    mockOsPlatform.mockReturnValue('linux');
 
     const result = await distribution['findPackageForDownload']('17.0.10');
 
@@ -228,16 +314,14 @@ describe('findPackageForDownload', () => {
 });
 
 describe('downloadTool', () => {
-  let spyDownloadTool: jest.SpyInstance;
+  let spyDownloadTool: any;
-  let spyExtractJdkFile: jest.SpyInstance;
+  let spyExtractJdkFile: any;
-  let spyCacheDir: jest.SpyInstance;
+  let spyCacheDir: any;
-  let spyVerifySignature: jest.SpyInstance;
+  let spyVerifySignature: any;
-  let distribution: MicrosoftDistributions;
+  let distribution: InstanceType<typeof MicrosoftDistributions>;
 
   beforeEach(() => {
-    jest
+    mockOsPlatform.mockReturnValue(process.platform);
-      .spyOn(os, 'platform')
-      .mockReturnValue(process.platform as ReturnType<typeof os.platform>);
 
     distribution = new MicrosoftDistributions({
       version: '17',
@@ -246,27 +330,27 @@ describe('downloadTool', () => {
       checkLatest: false
     });
 
-    spyDownloadTool = jest.spyOn(tc, 'downloadTool');
+    spyDownloadTool = tc.downloadTool as jest.Mock;
     spyDownloadTool.mockImplementation(async () => {
       return '/tmp/jdk.tar.gz';
     });
 
-    spyExtractJdkFile = jest.spyOn(util, 'extractJdkFile');
+    spyExtractJdkFile = util.extractJdkFile as jest.Mock;
     spyExtractJdkFile.mockImplementation(async () => {
       return '/tmp/unpacked';
     });
 
-    jest.spyOn(fs, 'readdirSync').mockReturnValue(['jdk'] as any);
+    mockReaddirSync.mockReturnValue(['jdk'] as any);
-    spyCacheDir = jest.spyOn(tc, 'cacheDir');
+    spyCacheDir = tc.cacheDir as jest.Mock;
     spyCacheDir.mockImplementation(async () => {
       return '/tmp/cached';
     });
 
-    jest
+    (util.renameWinArchive as jest.Mock<any>).mockImplementation(
-      .spyOn(util, 'renameWinArchive')
+      (archivePath: string) => `${archivePath}.zip`
-      .mockImplementation((archivePath: string) => `${archivePath}.zip`);
+    );
 
-    spyVerifySignature = jest.spyOn(gpg, 'verifyPackageSignature');
+    spyVerifySignature = gpg.verifyPackageSignature as jest.Mock;
     spyVerifySignature.mockImplementation(async () => {});
   });
 

__tests__/distributors/oracle-installer.test.ts

@@ -1,14 +1,53 @@
-import {OracleDistribution} from '../../src/distributions/oracle/installer';
+import {
+  jest,
+  describe,
+  it,
+  expect,
+  beforeEach,
+  afterEach,
+  beforeAll,
+  afterAll
+} from '@jest/globals';
 import os from 'os';
-import * as core from '@actions/core';
-import {getDownloadArchiveExtension} from '../../src/util';
 import {HttpClient} from '@actions/http-client';
 
+// Mock @actions/core before importing source modules that depend on it
+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)
+}));
+
+// Dynamic imports after mocking
+const core = await import('@actions/core');
+const {OracleDistribution} =
+  await import('../../src/distributions/oracle/installer.js');
+const {getDownloadArchiveExtension} = await import('../../src/util.js');
+
 describe('findPackageForDownload', () => {
-  let distribution: OracleDistribution;
+  let distribution: InstanceType<typeof OracleDistribution>;
-  let spyDebug: jest.SpyInstance;
+  let spyDebug: any;
-  let spyHttpClient: jest.SpyInstance;
+  let spyHttpClient: any;
-  let spyCoreError: jest.SpyInstance;
+  let spyCoreError: any;
 
   beforeEach(() => {
     distribution = new OracleDistribution({
@@ -18,11 +57,11 @@ describe('findPackageForDownload', () => {
       checkLatest: false
     });
 
-    spyDebug = jest.spyOn(core, 'debug');
+    spyDebug = core.debug as jest.Mock;
     spyDebug.mockImplementation(() => {});
 
     // Mock core.error to suppress error logs
-    spyCoreError = jest.spyOn(core, 'error');
+    spyCoreError = core.error as jest.Mock;
     spyCoreError.mockImplementation(() => {});
   });
 

__tests__/distributors/sapmachine-installer.test.ts

@@ -1,14 +1,59 @@
+import {
+  jest,
+  describe,
+  it,
+  expect,
+  beforeEach,
+  afterEach,
+  beforeAll,
+  afterAll
+} from '@jest/globals';
 import {HttpClient} from '@actions/http-client';
-import {SapMachineDistribution} from '../../src/distributions/sapmachine/installer';
-import * as utils from '../../src/util';
-import * as core from '@actions/core';
 
-import manifestData from '../data/sapmachine.json';
+import manifestData from '../data/sapmachine.json' with {type: 'json'};
+
+// Mock @actions/core before importing source modules that depend on it
+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)
+}));
+
+const real_util_module = await import('../../src/util.js');
+jest.unstable_mockModule('../../src/util.js', () => ({
+  ...real_util_module,
+  getDownloadArchiveExtension: jest.fn()
+}));
+
+// Dynamic imports after mocking
+const core = await import('@actions/core');
+const {SapMachineDistribution} =
+  await import('../../src/distributions/sapmachine/installer.js');
+const utils = await import('../../src/util.js');
 
 describe('getAvailableVersions', () => {
-  let spyHttpClient: jest.SpyInstance;
+  let spyHttpClient: any;
-  let spyUtilGetDownloadArchiveExtension: jest.SpyInstance;
+  let spyUtilGetDownloadArchiveExtension: any;
-  let spyCoreError: jest.SpyInstance;
+  let spyCoreError: any;
 
   beforeEach(() => {
     spyHttpClient = jest.spyOn(HttpClient.prototype, 'getJson');
@@ -18,14 +63,12 @@ describe('getAvailableVersions', () => {
       result: manifestData
     });
 
-    spyUtilGetDownloadArchiveExtension = jest.spyOn(
+    spyUtilGetDownloadArchiveExtension =
-      utils,
+      utils.getDownloadArchiveExtension as jest.Mock<any>;
-      'getDownloadArchiveExtension'
-    );
     spyUtilGetDownloadArchiveExtension.mockReturnValue('tar.gz');
 
     // Mock core.error to suppress error logs
-    spyCoreError = jest.spyOn(core, 'error');
+    spyCoreError = core.error as jest.Mock;
     spyCoreError.mockImplementation(() => {});
   });
 
@@ -36,7 +79,7 @@ describe('getAvailableVersions', () => {
   });
 
   const mockPlatform = (
-    distribution: SapMachineDistribution,
+    distribution: InstanceType<typeof SapMachineDistribution>,
     platform: string
   ) => {
     distribution['getPlatformOption'] = () => platform;

__tests__/distributors/semeru-installer.test.ts

@@ -1,15 +1,53 @@
+import {
+  jest,
+  describe,
+  it,
+  expect,
+  beforeEach,
+  afterEach,
+  beforeAll,
+  afterAll
+} from '@jest/globals';
+import type {JavaInstallerOptions} from '../../src/distributions/base-models.js';
 import {HttpClient} from '@actions/http-client';
 
-import {JavaInstallerOptions} from '../../src/distributions/base-models';
+import manifestData from '../data/semeru.json' with {type: 'json'};
-import {SemeruDistribution} from '../../src/distributions/semeru/installer';
 
-import manifestData from '../data/semeru.json';
+// Mock @actions/core before importing source modules that depend on it
-import * as core from '@actions/core';
+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)
+}));
+
+// Dynamic imports after mocking
+const core = await import('@actions/core');
+const {SemeruDistribution} =
+  await import('../../src/distributions/semeru/installer.js');
 
 describe('getAvailableVersions', () => {
-  let spyHttpClient: jest.SpyInstance;
+  let spyHttpClient: any;
-  let spyCoreError: jest.SpyInstance;
+  let spyCoreError: any;
-  let spyCoreWarning: jest.SpyInstance;
+  let spyCoreWarning: any;
 
   beforeEach(() => {
     spyHttpClient = jest.spyOn(HttpClient.prototype, 'getJson');
@@ -19,9 +57,9 @@ describe('getAvailableVersions', () => {
       result: []
     });
     // Mock core.error to suppress error logs
-    spyCoreError = jest.spyOn(core, 'error');
+    spyCoreError = core.error as jest.Mock;
     spyCoreError.mockImplementation(() => {});
-    spyCoreWarning = jest.spyOn(core, 'warning');
+    spyCoreWarning = core.warning as jest.Mock;
     spyCoreWarning.mockImplementation(() => {});
   });
 

__tests__/distributors/temurin-installer.test.ts

@@ -1,23 +1,92 @@
+import {
+  jest,
+  describe,
+  it,
+  expect,
+  beforeEach,
+  afterEach,
+  beforeAll,
+  afterAll
+} from '@jest/globals';
+import type {JavaInstallerOptions} from '../../src/distributions/base-models.js';
+import type {TemurinImplementation as TemurinImplementationType} from '../../src/distributions/temurin/installer.js';
 import {HttpClient} from '@actions/http-client';
-import * as tc from '@actions/tool-cache';
 import fs from 'fs';
 import os from 'os';
-import {
-  TemurinDistribution,
-  TemurinImplementation,
-  ADOPTIUM_PUBLIC_KEY
-} from '../../src/distributions/temurin/installer';
-import {JavaInstallerOptions} from '../../src/distributions/base-models';
-import * as util from '../../src/util';
-import * as gpg from '../../src/gpg';
 
-import manifestData from '../data/temurin.json';
+import manifestData from '../data/temurin.json' with {type: 'json'};
-import * as core from '@actions/core';
+
+// Mock @actions/core before importing source modules that depend on it
+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/tool-cache', () => ({
+  find: jest.fn(),
+  findAllVersions: jest.fn(),
+  downloadTool: jest.fn(),
+  extractZip: jest.fn(),
+  extractTar: jest.fn(),
+  extract7z: jest.fn(),
+  extractXar: jest.fn(),
+  cacheDir: jest.fn(),
+  cacheFile: jest.fn(),
+  getManifestFromRepo: jest.fn(),
+  findFromManifest: jest.fn(),
+  evaluateVersions: jest.fn()
+}));
+
+const real_util_module = await import('../../src/util.js');
+jest.unstable_mockModule('../../src/util.js', () => ({
+  ...real_util_module,
+  extractJdkFile: jest.fn(),
+  getDownloadArchiveExtension: jest.fn(),
+  getToolcachePath: jest.fn(),
+  isJobStatusSuccess: jest.fn(),
+  renameWinArchive: jest.fn(),
+  isVersionSatisfies: real_util_module.isVersionSatisfies,
+  getTempDir: real_util_module.getTempDir
+}));
+
+jest.unstable_mockModule('../../src/gpg.js', () => ({
+  importKey: jest.fn(),
+  deleteKey: jest.fn(),
+  verifyPackageSignature: jest.fn()
+}));
+
+// Dynamic imports after mocking
+const core = await import('@actions/core');
+const gpg = await import('../../src/gpg.js');
+const tc = await import('@actions/tool-cache');
+const {TemurinDistribution, TemurinImplementation, ADOPTIUM_PUBLIC_KEY} =
+  await import('../../src/distributions/temurin/installer.js');
+const util = await import('../../src/util.js');
 
 describe('getAvailableVersions', () => {
-  let spyHttpClient: jest.SpyInstance;
+  let spyHttpClient: any;
-  let spyCoreError: jest.SpyInstance;
+  let spyCoreError: any;
-  let spyCoreWarning: jest.SpyInstance;
+  let spyCoreWarning: any;
 
   beforeEach(() => {
     spyHttpClient = jest.spyOn(HttpClient.prototype, 'getJson');
@@ -27,9 +96,9 @@ describe('getAvailableVersions', () => {
       result: []
     });
     // Mock core.error to suppress error logs
-    spyCoreError = jest.spyOn(core, 'error');
+    spyCoreError = core.error as jest.Mock;
     spyCoreError.mockImplementation(() => {});
-    spyCoreWarning = jest.spyOn(core, 'warning');
+    spyCoreWarning = core.warning as jest.Mock;
     spyCoreWarning.mockImplementation(() => {});
   });
 
@@ -84,7 +153,7 @@ describe('getAvailableVersions', () => {
     'build correct url for %s',
     async (
       installerOptions: JavaInstallerOptions,
-      impl: TemurinImplementation,
+      impl: TemurinImplementationType,
       expectedParameters
     ) => {
       const distribution = new TemurinDistribution(installerOptions, impl);
@@ -163,7 +232,11 @@ describe('getAvailableVersions', () => {
     [TemurinImplementation.Hotspot, 'jre', 'Java_Temurin-Hotspot_jre']
   ])(
     'find right toolchain folder',
-    (impl: TemurinImplementation, packageType: string, expected: string) => {
+    (
+      impl: TemurinImplementationType,
+      packageType: string,
+      expected: string
+    ) => {
       const distribution = new TemurinDistribution(
         {
           version: '8',
@@ -289,25 +362,25 @@ describe('findPackageForDownload', () => {
 });
 
 describe('downloadTool', () => {
-  let spyDownloadTool: jest.SpyInstance;
+  let spyDownloadTool: any;
-  let spyVerifySignature: jest.SpyInstance;
+  let spyVerifySignature: any;
-  let spyExtractJdkFile: jest.SpyInstance;
+  let spyExtractJdkFile: any;
-  let spyCacheDir: jest.SpyInstance;
+  let spyCacheDir: any;
-  let spyReadDirSync: jest.SpyInstance;
+  let spyReadDirSync: any;
-  let spyRenameWinArchive: jest.SpyInstance;
+  let spyRenameWinArchive: any;
 
   beforeEach(() => {
-    spyDownloadTool = jest.spyOn(tc, 'downloadTool');
+    spyDownloadTool = tc.downloadTool as jest.Mock;
     spyDownloadTool.mockResolvedValue('/tmp/jdk.tar.gz');
-    spyVerifySignature = jest.spyOn(gpg, 'verifyPackageSignature');
+    spyVerifySignature = gpg.verifyPackageSignature as jest.Mock;
     spyVerifySignature.mockResolvedValue(undefined);
-    spyExtractJdkFile = jest.spyOn(util, 'extractJdkFile');
+    spyExtractJdkFile = util.extractJdkFile as jest.Mock;
     spyExtractJdkFile.mockResolvedValue('/tmp/extracted');
-    spyCacheDir = jest.spyOn(tc, 'cacheDir');
+    spyCacheDir = tc.cacheDir as jest.Mock;
     spyCacheDir.mockResolvedValue('/tmp/toolcache');
     spyReadDirSync = jest.spyOn(fs, 'readdirSync');
     spyReadDirSync.mockReturnValue(['jdk-17'] as any);
-    spyRenameWinArchive = jest.spyOn(util, 'renameWinArchive');
+    spyRenameWinArchive = util.renameWinArchive as jest.Mock;
     spyRenameWinArchive.mockReturnValue('/tmp/jdk.tar.gz.zip');
   });
 

__tests__/distributors/zulu-installer.test.ts

@@ -1,16 +1,60 @@
+import {
+  jest,
+  describe,
+  it,
+  expect,
+  beforeEach,
+  afterEach,
+  beforeAll,
+  afterAll
+} from '@jest/globals';
+import type {IZuluVersions} from '../../src/distributions/zulu/models.js';
 import {HttpClient} from '@actions/http-client';
-import {ZuluDistribution} from '../../src/distributions/zulu/installer';
-import {IZuluVersions} from '../../src/distributions/zulu/models';
-import * as utils from '../../src/util';
 import os from 'os';
-import * as core from '@actions/core';
 
-import manifestData from '../data/zulu-releases-default.json';
+import manifestData from '../data/zulu-releases-default.json' with {type: 'json'};
+
+// Mock @actions/core before importing source modules that depend on it
+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)
+}));
+
+const real_util_module = await import('../../src/util.js');
+jest.unstable_mockModule('../../src/util.js', () => ({
+  ...real_util_module,
+  getDownloadArchiveExtension: jest.fn()
+}));
+
+// Dynamic imports after mocking
+const core = await import('@actions/core');
+const {ZuluDistribution} =
+  await import('../../src/distributions/zulu/installer.js');
+const utils = await import('../../src/util.js');
 
 describe('getAvailableVersions', () => {
-  let spyHttpClient: jest.SpyInstance;
+  let spyHttpClient: any;
-  let spyUtilGetDownloadArchiveExtension: jest.SpyInstance;
+  let spyCoreError: any;
-  let spyCoreError: jest.SpyInstance;
 
   beforeEach(() => {
     spyHttpClient = jest.spyOn(HttpClient.prototype, 'getJson');
@@ -20,14 +64,12 @@ describe('getAvailableVersions', () => {
       result: manifestData as IZuluVersions[]
     });
 
-    spyUtilGetDownloadArchiveExtension = jest.spyOn(
+    (utils.getDownloadArchiveExtension as jest.Mock<any>).mockReturnValue(
-      utils,
+      'tar.gz'
-      'getDownloadArchiveExtension'
     );
-    spyUtilGetDownloadArchiveExtension.mockReturnValue('tar.gz');
 
     // Mock core.error to suppress error logs
-    spyCoreError = jest.spyOn(core, 'error');
+    spyCoreError = core.error as jest.Mock;
     spyCoreError.mockImplementation(() => {});
   });
 

__tests__/distributors/zulu-linux-installer.test.ts

@@ -1,17 +1,62 @@
+import {
+  jest,
+  describe,
+  it,
+  expect,
+  beforeEach,
+  afterEach,
+  beforeAll,
+  afterAll
+} from '@jest/globals';
+import type {IZuluVersions} from '../../src/distributions/zulu/models.js';
 import {HttpClient} from '@actions/http-client';
 import * as semver from 'semver';
-import {ZuluDistribution} from '../../src/distributions/zulu/installer';
-import {IZuluVersions} from '../../src/distributions/zulu/models';
-import * as utils from '../../src/util';
 import os from 'os';
-import * as core from '@actions/core';
 
-import manifestData from '../data/zulu-linux.json';
+import manifestData from '../data/zulu-linux.json' with {type: 'json'};
+
+// Mock @actions/core before importing source modules that depend on it
+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)
+}));
+
+const real_util_module = await import('../../src/util.js');
+jest.unstable_mockModule('../../src/util.js', () => ({
+  ...real_util_module,
+  getDownloadArchiveExtension: jest.fn()
+}));
+
+// Dynamic imports after mocking
+const core = await import('@actions/core');
+const {ZuluDistribution} =
+  await import('../../src/distributions/zulu/installer.js');
+const utils = await import('../../src/util.js');
 
 describe('getAvailableVersions', () => {
-  let spyHttpClient: jest.SpyInstance;
+  let spyHttpClient: any;
-  let spyUtilGetDownloadArchiveExtension: jest.SpyInstance;
+  let spyUtilGetDownloadArchiveExtension: any;
-  let spyCoreError: jest.SpyInstance;
+  let spyCoreError: any;
 
   beforeEach(() => {
     spyHttpClient = jest.spyOn(HttpClient.prototype, 'getJson');
@@ -21,14 +66,12 @@ describe('getAvailableVersions', () => {
       result: manifestData as IZuluVersions[]
     });
 
-    spyUtilGetDownloadArchiveExtension = jest.spyOn(
+    spyUtilGetDownloadArchiveExtension =
-      utils,
+      utils.getDownloadArchiveExtension as jest.Mock<any>;
-      'getDownloadArchiveExtension'
-    );
     spyUtilGetDownloadArchiveExtension.mockReturnValue('zip');
 
     // Mock core.error to suppress error logs
-    spyCoreError = jest.spyOn(core, 'error');
+    spyCoreError = core.error as jest.Mock;
     spyCoreError.mockImplementation(() => {});
   });
 

__tests__/distributors/zulu-windows-installer.test.ts

@@ -1,17 +1,61 @@
+import {
+  jest,
+  describe,
+  it,
+  expect,
+  beforeEach,
+  afterEach,
+  beforeAll,
+  afterAll
+} from '@jest/globals';
+import type {IZuluVersions} from '../../src/distributions/zulu/models.js';
 import {HttpClient} from '@actions/http-client';
 import * as semver from 'semver';
-import {ZuluDistribution} from '../../src/distributions/zulu/installer';
-import {IZuluVersions} from '../../src/distributions/zulu/models';
-import * as utils from '../../src/util';
 import os from 'os';
-import * as core from '@actions/core';
 
-import manifestData from '../data/zulu-windows.json';
+import manifestData from '../data/zulu-windows.json' with {type: 'json'};
+
+// Mock @actions/core before importing source modules that depend on it
+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)
+}));
+
+const real_util_module = await import('../../src/util.js');
+jest.unstable_mockModule('../../src/util.js', () => ({
+  ...real_util_module,
+  getDownloadArchiveExtension: jest.fn()
+}));
+
+// Dynamic imports after mocking
+const core = await import('@actions/core');
+const {ZuluDistribution} =
+  await import('../../src/distributions/zulu/installer.js');
+const utils = await import('../../src/util.js');
 
 describe('getAvailableVersions', () => {
-  let spyHttpClient: jest.SpyInstance;
+  let spyHttpClient: any;
-  let spyUtilGetDownloadArchiveExtension: jest.SpyInstance;
+  let spyCoreError: any;
-  let spyCoreError: jest.SpyInstance;
 
   beforeEach(() => {
     spyHttpClient = jest.spyOn(HttpClient.prototype, 'getJson');
@@ -21,14 +65,12 @@ describe('getAvailableVersions', () => {
       result: manifestData as IZuluVersions[]
     });
 
-    spyUtilGetDownloadArchiveExtension = jest.spyOn(
+    (utils.getDownloadArchiveExtension as jest.Mock<any>).mockReturnValue(
-      utils,
+      'zip'
-      'getDownloadArchiveExtension'
     );
-    spyUtilGetDownloadArchiveExtension.mockReturnValue('zip');
 
     // Mock core.error to suppress error logs
-    spyCoreError = jest.spyOn(core, 'error');
+    spyCoreError = core.error as jest.Mock;
     spyCoreError.mockImplementation(() => {});
   });
 

__tests__/gpg.test.ts

@@ -1,20 +1,29 @@
+import {
+  jest,
+  describe,
+  it,
+  expect,
+  beforeEach,
+  afterAll,
+  afterEach
+} from '@jest/globals';
+import {fileURLToPath} from 'url';
 import * as path from 'path';
 import * as io from '@actions/io';
-import * as exec from '@actions/exec';
-import * as tc from '@actions/tool-cache';
-import * as gpg from '../src/gpg';
 
-jest.mock('@actions/exec', () => {
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
-  return {
+
+jest.unstable_mockModule('@actions/exec', () => ({
   exec: jest.fn()
-  };
+}));
-});
 
-jest.mock('@actions/tool-cache', () => {
+jest.unstable_mockModule('@actions/tool-cache', () => ({
-  return {
   downloadTool: jest.fn()
-  };
+}));
-});
+
+const exec = await import('@actions/exec');
+const tc = await import('@actions/tool-cache');
+const gpg = await import('../src/gpg.js');
 
 const tempDir = path.join(__dirname, 'runner', 'temp');
 process.env['RUNNER_TEMP'] = tempDir;
@@ -92,7 +101,9 @@ describe('gpg tests', () => {
       it('imports bundled key and verifies package', async () => {
         const publicKeyContent =
           '-----BEGIN PGP PUBLIC KEY BLOCK-----\ntest\n-----END PGP PUBLIC KEY BLOCK-----';
-        (tc.downloadTool as jest.Mock).mockResolvedValue('/tmp/jdk.tar.gz.sig');
+        (tc.downloadTool as jest.Mock<any>).mockResolvedValue(
+          '/tmp/jdk.tar.gz.sig'
+        );
         await gpg.verifyPackageSignature(
           '/tmp/jdk.tar.gz',
           'https://example.com/jdk.tar.gz.sig',

__tests__/maven-args.test.ts

@@ -1,42 +1,68 @@
-import * as core from '@actions/core';
+import {afterEach, beforeEach, describe, expect, it, jest} from '@jest/globals';
 
-import {configureMavenArgs} from '../src/maven-args';
+const mockGetInput = jest.fn<(...args: any[]) => any>();
-import {
+const mockExportVariable = jest.fn<(...args: any[]) => any>();
+const mockInfo = jest.fn<(...args: any[]) => any>();
+const mockDebug = jest.fn<(...args: any[]) => any>();
+const mockWarning = jest.fn<(...args: any[]) => any>();
+
+jest.unstable_mockModule('@actions/core', () => ({
+  getInput: mockGetInput,
+  exportVariable: mockExportVariable,
+  info: mockInfo,
+  debug: mockDebug,
+  warning: mockWarning,
+  setSecret: jest.fn(),
+  setFailed: jest.fn(),
+  setOutput: jest.fn(),
+  addPath: jest.fn(),
+  getMultilineInput: jest.fn(),
+  getBooleanInput: jest.fn(),
+  getState: jest.fn(),
+  saveState: jest.fn(),
+  error: jest.fn(),
+  notice: jest.fn(),
+  startGroup: jest.fn(),
+  endGroup: jest.fn(),
+  group: jest.fn(),
+  isDebug: jest.fn(),
+  setCommandEcho: jest.fn(),
+  getIDToken: jest.fn(),
+  ExitCode: {Success: 0, Failure: 1},
+  summary: {},
+  markdownSummary: {},
+  platform: {},
+  toPosixPath: jest.fn(),
+  toWin32Path: jest.fn(),
+  toPlatformPath: jest.fn()
+}));
+
+const {configureMavenArgs} = await import('../src/maven-args.js');
+const {
   INPUT_SHOW_DOWNLOAD_PROGRESS,
   MAVEN_ARGS_ENV,
   MAVEN_NO_TRANSFER_PROGRESS_FLAG
-} from '../src/constants';
+} = await import('../src/constants.js');
 
 describe('configureMavenArgs', () => {
   let inputs: Record<string, string>;
-  let spyGetInput: jest.SpyInstance;
-  let spyExportVariable: jest.SpyInstance;
-  let spyInfo: jest.SpyInstance;
-  let spyDebug: jest.SpyInstance;
   const originalMavenArgs = process.env[MAVEN_ARGS_ENV];
 
   beforeEach(() => {
     inputs = {};
 
-    spyGetInput = jest.spyOn(core, 'getInput');
+    mockGetInput.mockImplementation((name: string) => inputs[name] ?? '');
-    spyGetInput.mockImplementation((name: string) => inputs[name] ?? '');
+    mockExportVariable.mockImplementation((name: string, value: string) => {
-
-    spyExportVariable = jest.spyOn(core, 'exportVariable');
-    spyExportVariable.mockImplementation((name: string, value: string) => {
       process.env[name] = value;
     });
-
+    mockInfo.mockImplementation(() => undefined);
-    spyInfo = jest.spyOn(core, 'info');
+    mockDebug.mockImplementation(() => undefined);
-    spyInfo.mockImplementation(() => undefined);
-
-    spyDebug = jest.spyOn(core, 'debug');
-    spyDebug.mockImplementation(() => undefined);
 
     delete process.env[MAVEN_ARGS_ENV];
   });
 
   afterEach(() => {
-    jest.restoreAllMocks();
+    jest.resetAllMocks();
     if (originalMavenArgs === undefined) {
       delete process.env[MAVEN_ARGS_ENV];
     } else {
@@ -47,7 +73,7 @@ describe('configureMavenArgs', () => {
   it('sets MAVEN_ARGS with -ntp by default', () => {
     configureMavenArgs();
 
-    expect(spyExportVariable).toHaveBeenCalledWith(
+    expect(mockExportVariable).toHaveBeenCalledWith(
       MAVEN_ARGS_ENV,
       MAVEN_NO_TRANSFER_PROGRESS_FLAG
     );
@@ -59,7 +85,7 @@ describe('configureMavenArgs', () => {
 
     configureMavenArgs();
 
-    expect(spyExportVariable).not.toHaveBeenCalled();
+    expect(mockExportVariable).not.toHaveBeenCalled();
     expect(process.env[MAVEN_ARGS_ENV]).toBeUndefined();
   });
 
@@ -68,7 +94,7 @@ describe('configureMavenArgs', () => {
 
     configureMavenArgs();
 
-    expect(spyExportVariable).toHaveBeenCalledWith(
+    expect(mockExportVariable).toHaveBeenCalledWith(
       MAVEN_ARGS_ENV,
       `-B -Dstyle.color=always ${MAVEN_NO_TRANSFER_PROGRESS_FLAG}`
     );
@@ -79,7 +105,7 @@ describe('configureMavenArgs', () => {
 
     configureMavenArgs();
 
-    expect(spyExportVariable).not.toHaveBeenCalled();
+    expect(mockExportVariable).not.toHaveBeenCalled();
     expect(process.env[MAVEN_ARGS_ENV]).toBe('-B -ntp');
   });
 
@@ -88,7 +114,7 @@ describe('configureMavenArgs', () => {
 
     configureMavenArgs();
 
-    expect(spyExportVariable).not.toHaveBeenCalled();
+    expect(mockExportVariable).not.toHaveBeenCalled();
     expect(process.env[MAVEN_ARGS_ENV]).toBe('--no-transfer-progress -B');
   });
 
@@ -98,7 +124,7 @@ describe('configureMavenArgs', () => {
 
     configureMavenArgs();
 
-    expect(spyExportVariable).not.toHaveBeenCalled();
+    expect(mockExportVariable).not.toHaveBeenCalled();
     expect(process.env[MAVEN_ARGS_ENV]).toBe('-B');
   });
 });

__tests__/toolchains.test.ts

@@ -1,23 +1,63 @@
+import {
+  jest,
+  describe,
+  it,
+  expect,
+  beforeEach,
+  afterEach,
+  beforeAll,
+  afterAll
+} from '@jest/globals';
+import {fileURLToPath} from 'url';
 import * as fs from 'fs';
 import os from 'os';
 import * as path from 'path';
-import * as core from '@actions/core';
 import * as io from '@actions/io';
-import * as toolchains from '../src/toolchains';
-import {M2_DIR, MVN_TOOLCHAINS_FILE} from '../src/constants';
 
+// Mock @actions/core before importing source modules that depend on it
+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)
+}));
+
+// Dynamic imports after mocking
+const core = await import('@actions/core');
+const toolchains = await import('../src/toolchains.js');
+const {M2_DIR, MVN_TOOLCHAINS_FILE} = await import('../src/constants.js');
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
 const m2Dir = path.join(__dirname, M2_DIR);
 const toolchainsFile = path.join(m2Dir, MVN_TOOLCHAINS_FILE);
 
 describe('toolchains tests', () => {
-  let spyOSHomedir: jest.SpyInstance;
+  let spyOSHomedir: any;
-  let spyInfo: jest.SpyInstance;
+  let spyInfo: any;
 
   beforeEach(async () => {
     await io.rmRF(m2Dir);
     spyOSHomedir = jest.spyOn(os, 'homedir');
     spyOSHomedir.mockReturnValue(__dirname);
-    spyInfo = jest.spyOn(core, 'info');
+    spyInfo = core.info as jest.Mock;
     spyInfo.mockImplementation(() => null);
   }, 300000);
 
@@ -895,6 +935,11 @@ describe('toolchains tests', () => {
     const jdkHome =
       '/opt/hostedtoolcache/Java_Temurin-Hotspot_jdk/17.0.1-12/x64';
 
+    (core.getInput as jest.Mock<any>).mockImplementation((name: string) => {
+      if (name === 'settings-path') return m2Dir;
+      return '';
+    });
+
     await toolchains.configureToolchains(
       version,
       distributionName,

__tests__/util.test.ts

@@ -1,8 +1,55 @@
-import * as cache from '@actions/cache';
+import {
-import * as core from '@actions/core';
+  jest,
+  describe,
+  it,
+  expect,
+  beforeEach,
+  afterAll,
+  afterEach
+} from '@jest/globals';
+import {fileURLToPath} from 'url';
 import * as fs from 'fs';
 import * as path from 'path';
-import {
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+
+// Mock @actions/cache
+jest.unstable_mockModule('@actions/cache', () => ({
+  isFeatureAvailable: jest.fn(),
+  saveCache: jest.fn(),
+  restoreCache: jest.fn()
+}));
+
+// Mock @actions/core
+jest.unstable_mockModule('@actions/core', () => ({
+  getInput: jest.fn(),
+  getBooleanInput: jest.fn(),
+  getMultilineInput: jest.fn(),
+  setOutput: jest.fn(),
+  setFailed: jest.fn(),
+  warning: jest.fn(),
+  info: jest.fn(),
+  debug: jest.fn(),
+  error: jest.fn(),
+  notice: jest.fn(),
+  startGroup: jest.fn(),
+  endGroup: jest.fn(),
+  addPath: jest.fn(),
+  exportVariable: jest.fn(),
+  saveState: jest.fn(),
+  getState: jest.fn(),
+  setSecret: jest.fn(),
+  isDebug: jest.fn(() => false),
+  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)
+}));
+
+const cache = await import('@actions/cache');
+const core = await import('@actions/core');
+
+const {
   convertVersionToSemver,
   getNextPageUrlFromLinkHeader,
   getVersionFromFileContent,
@@ -10,10 +57,7 @@ import {
   isCacheFeatureAvailable,
   isGhes,
   validatePaginationUrl
-} from '../src/util';
+} = await import('../src/util.js');
-
-jest.mock('@actions/cache');
-jest.mock('@actions/core');
 
 describe('isVersionSatisfies', () => {
   it.each([
@@ -45,8 +89,10 @@ describe('isVersionSatisfies', () => {
 
 describe('isCacheFeatureAvailable', () => {
   it('isCacheFeatureAvailable disabled on GHES', () => {
-    jest.spyOn(cache, 'isFeatureAvailable').mockImplementation(() => false);
+    (cache.isFeatureAvailable as jest.Mock<any>).mockImplementation(
-    const infoMock = jest.spyOn(core, 'warning');
+      () => false
+    );
+    const infoMock = core.warning as jest.Mock;
     const message =
       'Caching is only supported on GHES version >= 3.5. If you are on a version >= 3.5, please check with your GHES admin if the Actions cache service is enabled or not.';
     try {
@@ -59,8 +105,10 @@ describe('isCacheFeatureAvailable', () => {
   });
 
   it('isCacheFeatureAvailable disabled on dotcom', () => {
-    jest.spyOn(cache, 'isFeatureAvailable').mockImplementation(() => false);
+    (cache.isFeatureAvailable as jest.Mock<any>).mockImplementation(
-    const infoMock = jest.spyOn(core, 'warning');
+      () => false
+    );
+    const infoMock = core.warning as jest.Mock;
     const message =
       'The runner was not able to contact the cache service. Caching will be skipped';
     try {
@@ -73,9 +121,14 @@ describe('isCacheFeatureAvailable', () => {
   });
 
   it('isCacheFeatureAvailable is enabled', () => {
-    jest.spyOn(cache, 'isFeatureAvailable').mockImplementation(() => true);
+    (cache.isFeatureAvailable as jest.Mock<any>).mockImplementation(() => true);
     expect(isCacheFeatureAvailable()).toBe(true);
   });
+
+  afterEach(() => {
+    jest.resetAllMocks();
+    jest.clearAllMocks();
+  });
 });
 
 describe('convertVersionToSemver', () => {
@@ -249,7 +302,6 @@ describe('isGhes', () => {
   const pristineEnv = process.env;
 
   beforeEach(() => {
-    jest.resetModules();
     process.env = {...pristineEnv};
   });
 

dist/cleanup/package.json

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

dist/setup/package.json

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

eslint.config.mjs

@@ -0,0 +1,74 @@
+// 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-undef': 'off',
+      '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-java",
-  "version": "5.3.0",
+  "version": "6.0.0",
+  "type": "module",
   "private": true,
   "description": "setup java action",
   "main": "dist/setup/index.js",
@@ -9,24 +10,24 @@
   },
   "scripts": {
     "build": "ncc build -o dist/setup src/setup-java.ts && ncc build -o dist/cleanup src/cleanup-java.ts",
-    "format": "prettier --no-error-on-unmatched-pattern --config ./.prettierrc.js --write \"**/*.{ts,yml,yaml}\"",
+    "format": "prettier --no-error-on-unmatched-pattern --write \"**/*.{ts,yml,yaml}\"",
-    "format-check": "prettier --no-error-on-unmatched-pattern --config ./.prettierrc.js --check \"**/*.{ts,yml,yaml}\"",
+    "format-check": "prettier --no-error-on-unmatched-pattern --check \"**/*.{ts,yml,yaml}\"",
-    "lint": "eslint --config ./.eslintrc.js \"**/*.ts\"",
+    "lint": "eslint \"**/*.ts\"",
-    "lint:fix": "eslint --config ./.eslintrc.js \"**/*.ts\" --fix",
+    "lint:fix": "eslint \"**/*.ts\" --fix",
     "check": "npm run format-check && npm run lint && npm run build && npm test",
     "fix": "npm run format && npm run lint:fix && npm run build",
     "prepare": "husky install",
     "prerelease": "npm run-script build",
     "release": "git add -f dist/setup/index.js dist/cleanup/index.js",
-    "test": "jest"
+    "test": "node --experimental-vm-modules ./node_modules/jest/bin/jest.js --runInBand --coverage"
   },
   "lint-staged": {
     "*.ts": [
-      "prettier --no-error-on-unmatched-pattern --config ./.prettierrc.js --write",
+      "prettier --no-error-on-unmatched-pattern --write",
-      "eslint --config ./.eslintrc.js --fix"
+      "eslint --fix"
     ],
     "*.{yml,yaml}": [
-      "prettier --no-error-on-unmatched-pattern --config ./.prettierrc.js --write"
+      "prettier --no-error-on-unmatched-pattern --write"
     ]
   },
   "repository": {
@@ -41,34 +42,35 @@
   "author": "GitHub",
   "license": "MIT",
   "dependencies": {
-    "@actions/cache": "^5.1.0",
+    "@actions/cache": "^6.1.0",
-    "@actions/core": "^2.0.3",
+    "@actions/core": "^3.0.1",
-    "@actions/exec": "^2.0.0",
+    "@actions/exec": "^3.0.0",
-    "@actions/glob": "^0.5.1",
+    "@actions/glob": "^0.7.0",
-    "@actions/http-client": "^3.0.2",
+    "@actions/http-client": "^4.0.1",
-    "@actions/io": "^2.0.0",
+    "@actions/io": "^3.0.2",
-    "@actions/tool-cache": "^3.0.1",
+    "@actions/tool-cache": "^4.0.0",
-    "semver": "^7.6.0",
+    "semver": "^7.8.5",
     "xmlbuilder2": "^4.0.3"
   },
   "devDependencies": {
-    "@types/jest": "^30.0.0",
+    "@eslint/js": "^10.0.1",
+    "@jest/globals": "^30.4.1",
     "@types/node": "^26.0.0",
-    "@types/semver": "^7.5.8",
+    "@types/semver": "^7.7.0",
-    "@typescript-eslint/eslint-plugin": "^8.48.0",
+    "@typescript-eslint/eslint-plugin": "^8.62.0",
     "@typescript-eslint/parser": "^8.62.0",
     "@vercel/ncc": "^0.44.0",
-    "eslint": "^8.57.0",
+    "eslint": "^10.5.0",
     "eslint-config-prettier": "^10.1.8",
     "eslint-plugin-jest": "^29.15.4",
-    "eslint-plugin-node": "^11.1.0",
+    "eslint-plugin-n": "^18.1.0",
+    "globals": "^17.7.0",
     "husky": "^9.1.7",
     "jest": "^30.4.2",
-    "jest-circus": "^30.4.2",
     "lint-staged": "^17.0.8",
     "prettier": "^3.9.1",
     "ts-jest": "^29.4.11",
-    "typescript": "^5.3.3"
+    "typescript": "^6.0.3"
   },
   "bugs": {
     "url": "https://github.com/actions/setup-java/issues"

src/auth.ts

@@ -6,9 +6,9 @@ import * as fs from 'fs';
 import * as os from 'os';
 
 import {create as xmlCreate} from 'xmlbuilder2';
-import * as constants from './constants';
+import * as constants from './constants.js';
-import * as gpg from './gpg';
+import * as gpg from './gpg.js';
-import {getBooleanInput} from './util';
+import {getBooleanInput} from './util.js';
 
 export async function configureAuthentication() {
   const id = core.getInput(constants.INPUT_SERVER_ID);

src/cleanup-java.ts

@@ -1,8 +1,9 @@
 import * as core from '@actions/core';
-import * as gpg from './gpg';
+import * as gpg from './gpg.js';
-import * as constants from './constants';
+import * as constants from './constants.js';
-import {isJobStatusSuccess} from './util';
+import {isJobStatusSuccess} from './util.js';
-import {save} from './cache';
+import {save} from './cache.js';
+import {fileURLToPath} from 'url';
 
 async function removePrivateKeyFromKeychain() {
   if (core.getInput(constants.INPUT_GPG_PRIVATE_KEY, {required: false})) {
@@ -52,7 +53,7 @@ export async function run() {
   await ignoreError(saveCache());
 }
 
-if (require.main === module) {
+if (process.argv[1] === fileURLToPath(import.meta.url)) {
   run();
 } else {
   // https://nodejs.org/api/modules.html#modules_accessing_the_main_module

src/distributions/adopt/installer.ts

@@ -5,13 +5,13 @@ import fs from 'fs';
 import path from 'path';
 import semver from 'semver';
 
-import {JavaBase} from '../base-installer';
+import {JavaBase} from '../base-installer.js';
-import {IAdoptAvailableVersions} from './models';
+import {IAdoptAvailableVersions} from './models.js';
 import {
   JavaDownloadRelease,
   JavaInstallerOptions,
   JavaInstallerResults
-} from '../base-models';
+} from '../base-models.js';
 import {
   extractJdkFile,
   getNextPageUrlFromLinkHeader,
@@ -20,8 +20,11 @@ import {
   renameWinArchive,
   MAX_PAGINATION_PAGES,
   validatePaginationUrl
-} from '../../util';
+} from '../../util.js';
-import {TemurinDistribution, TemurinImplementation} from '../temurin/installer';
+import {
+  TemurinDistribution,
+  TemurinImplementation
+} from '../temurin/installer.js';
 
 export enum AdoptImplementation {
   Hotspot = 'Hotspot',

src/distributions/base-installer.ts

@@ -4,13 +4,13 @@ import * as fs from 'fs';
 import semver from 'semver';
 import path from 'path';
 import * as httpm from '@actions/http-client';
-import {getToolcachePath, isVersionSatisfies} from '../util';
+import {getToolcachePath, isVersionSatisfies} from '../util.js';
 import {
   JavaDownloadRelease,
   JavaInstallerOptions,
   JavaInstallerResults
-} from './base-models';
+} from './base-models.js';
-import {MACOS_JAVA_CONTENT_POSTFIX} from '../constants';
+import {MACOS_JAVA_CONTENT_POSTFIX} from '../constants.js';
 import os from 'os';
 
 export abstract class JavaBase {

src/distributions/corretto/installer.ts

@@ -7,17 +7,17 @@ import {
   getDownloadArchiveExtension,
   convertVersionToSemver,
   renameWinArchive
-} from '../../util';
+} from '../../util.js';
-import {JavaBase} from '../base-installer';
+import {JavaBase} from '../base-installer.js';
 import {
   JavaDownloadRelease,
   JavaInstallerOptions,
   JavaInstallerResults
-} from '../base-models';
+} from '../base-models.js';
 import {
   ICorrettoAllAvailableVersions,
   ICorrettoAvailableVersions
-} from './models';
+} from './models.js';
 
 export class CorrettoDistribution extends JavaBase {
   constructor(installerOptions: JavaInstallerOptions) {

src/distributions/distribution-factory.ts

@@ -1,22 +1,25 @@
-import {JavaBase} from './base-installer';
+import {JavaBase} from './base-installer.js';
-import {JavaInstallerOptions} from './base-models';
+import {JavaInstallerOptions} from './base-models.js';
-import {LocalDistribution} from './local/installer';
+import {LocalDistribution} from './local/installer.js';
-import {ZuluDistribution} from './zulu/installer';
+import {ZuluDistribution} from './zulu/installer.js';
-import {AdoptDistribution, AdoptImplementation} from './adopt/installer';
+import {AdoptDistribution, AdoptImplementation} from './adopt/installer.js';
-import {TemurinDistribution, TemurinImplementation} from './temurin/installer';
+import {
-import {LibericaDistributions} from './liberica/installer';
+  TemurinDistribution,
-import {MicrosoftDistributions} from './microsoft/installer';
+  TemurinImplementation
-import {SemeruDistribution} from './semeru/installer';
+} from './temurin/installer.js';
-import {CorrettoDistribution} from './corretto/installer';
+import {LibericaDistributions} from './liberica/installer.js';
-import {OracleDistribution} from './oracle/installer';
+import {MicrosoftDistributions} from './microsoft/installer.js';
-import {DragonwellDistribution} from './dragonwell/installer';
+import {SemeruDistribution} from './semeru/installer.js';
-import {SapMachineDistribution} from './sapmachine/installer';
+import {CorrettoDistribution} from './corretto/installer.js';
+import {OracleDistribution} from './oracle/installer.js';
+import {DragonwellDistribution} from './dragonwell/installer.js';
+import {SapMachineDistribution} from './sapmachine/installer.js';
 import {
   GraalVMCommunityDistribution,
   GraalVMDistribution
-} from './graalvm/installer';
+} from './graalvm/installer.js';
-import {JetBrainsDistribution} from './jetbrains/installer';
+import {JetBrainsDistribution} from './jetbrains/installer.js';
-import {KonaDistribution} from './kona/installer';
+import {KonaDistribution} from './kona/installer.js';
 
 enum JavaDistribution {
   Adopt = 'adopt',

src/distributions/dragonwell/installer.ts

@@ -5,7 +5,7 @@ import semver from 'semver';
 import fs from 'fs';
 import path from 'path';
 
-import {JavaBase} from '../base-installer';
+import {JavaBase} from '../base-installer.js';
 import {
   convertVersionToSemver,
   extractJdkFile,
@@ -13,13 +13,13 @@ import {
   getGitHubHttpHeaders,
   isVersionSatisfies,
   renameWinArchive
-} from '../../util';
+} from '../../util.js';
-import {IDragonwellVersions, IDragonwellAllVersions} from './models';
+import {IDragonwellVersions, IDragonwellAllVersions} from './models.js';
 import {
   JavaDownloadRelease,
   JavaInstallerOptions,
   JavaInstallerResults
-} from '../base-models';
+} from '../base-models.js';
 
 export class DragonwellDistribution extends JavaBase {
   constructor(installerOptions: JavaInstallerOptions) {

src/distributions/graalvm/installer.ts

@@ -3,14 +3,14 @@ import * as tc from '@actions/tool-cache';
 import fs from 'fs';
 import path from 'path';
 import semver from 'semver';
-import {JavaBase} from '../base-installer';
+import {JavaBase} from '../base-installer.js';
 import {HttpCodes} from '@actions/http-client';
-import {GraalVMEAVersion} from './models';
+import {GraalVMEAVersion} from './models.js';
 import {
   JavaDownloadRelease,
   JavaInstallerOptions,
   JavaInstallerResults
-} from '../base-models';
+} from '../base-models.js';
 import {
   convertVersionToSemver,
   extractJdkFile,
@@ -21,7 +21,7 @@ import {
   MAX_PAGINATION_PAGES,
   renameWinArchive,
   validatePaginationUrl
-} from '../../util';
+} from '../../util.js';
 
 const GRAALVM_DL_BASE = 'https://download.oracle.com/graalvm';
 const GRAALVM_DOWNLOAD_URL = 'https://www.graalvm.org/downloads/';
@@ -300,17 +300,20 @@ export class GraalVMDistribution extends JavaBase {
         // Check if it's a 404 error (file not found)
         if (error.message?.includes('404')) {
           throw new Error(
-            `GraalVM EA version '${javaEaVersion}' not found. Please verify the version exists in the EA builds repository.`
+            `GraalVM EA version '${javaEaVersion}' not found. Please verify the version exists in the EA builds repository.`,
+            {cause: error}
           );
         }
         // Re-throw with more context
         throw new Error(
-          `Failed to fetch GraalVM EA version information for '${javaEaVersion}': ${error.message}`
+          `Failed to fetch GraalVM EA version information for '${javaEaVersion}': ${error.message}`,
+          {cause: error}
         );
       }
       // If it's not an Error instance, throw a generic error
       throw new Error(
-        `Failed to fetch GraalVM EA version information for '${javaEaVersion}'`
+        `Failed to fetch GraalVM EA version information for '${javaEaVersion}'`,
+        {cause: error}
       );
     }
   }

src/distributions/jetbrains/installer.ts

@@ -5,14 +5,14 @@ import fs from 'fs';
 import path from 'path';
 import semver from 'semver';
 
-import {JavaBase} from '../base-installer';
+import {JavaBase} from '../base-installer.js';
-import {IJetBrainsRawVersion, IJetBrainsVersion} from './models';
+import {IJetBrainsRawVersion, IJetBrainsVersion} from './models.js';
 import {
   JavaDownloadRelease,
   JavaInstallerOptions,
   JavaInstallerResults
-} from '../base-models';
+} from '../base-models.js';
-import {extractJdkFile, isVersionSatisfies} from '../../util';
+import {extractJdkFile, isVersionSatisfies} from '../../util.js';
 import {OutgoingHttpHeaders} from 'http';
 import {HttpCodes} from '@actions/http-client';
 

src/distributions/kona/installer.ts

@@ -5,19 +5,19 @@ import semver from 'semver';
 import fs from 'fs';
 import path from 'path';
 
-import {JavaBase} from '../base-installer';
+import {JavaBase} from '../base-installer.js';
-import {IKonaReleaseInfo, IKonaRelease} from './models';
+import {IKonaReleaseInfo, IKonaRelease} from './models.js';
 import {
   JavaDownloadRelease,
   JavaInstallerOptions,
   JavaInstallerResults
-} from '../base-models';
+} from '../base-models.js';
 import {
   extractJdkFile,
   getDownloadArchiveExtension,
   isVersionSatisfies,
   renameWinArchive
-} from '../../util';
+} from '../../util.js';
 
 export class KonaDistribution extends JavaBase {
   constructor(installerOptions: JavaInstallerOptions) {

src/distributions/liberica/installer.ts

@@ -1,18 +1,18 @@
-import {JavaBase} from '../base-installer';
+import {JavaBase} from '../base-installer.js';
 import {
   JavaDownloadRelease,
   JavaInstallerOptions,
   JavaInstallerResults
-} from '../base-models';
+} from '../base-models.js';
 import semver from 'semver';
 import {
   extractJdkFile,
   getDownloadArchiveExtension,
   isVersionSatisfies,
   renameWinArchive
-} from '../../util';
+} from '../../util.js';
 import * as core from '@actions/core';
-import {ArchitectureOptions, LibericaVersion, OsVersions} from './models';
+import {ArchitectureOptions, LibericaVersion, OsVersions} from './models.js';
 import * as tc from '@actions/tool-cache';
 import fs from 'fs';
 import path from 'path';

src/distributions/local/installer.ts

@@ -4,14 +4,14 @@ import * as core from '@actions/core';
 import fs from 'fs';
 import path from 'path';
 
-import {JavaBase} from '../base-installer';
+import {JavaBase} from '../base-installer.js';
 import {
   JavaInstallerOptions,
   JavaDownloadRelease,
   JavaInstallerResults
-} from '../base-models';
+} from '../base-models.js';
-import {extractJdkFile} from '../../util';
+import {extractJdkFile} from '../../util.js';
-import {MACOS_JAVA_CONTENT_POSTFIX} from '../../constants';
+import {MACOS_JAVA_CONTENT_POSTFIX} from '../../constants.js';
 
 export class LocalDistribution extends JavaBase {
   constructor(

src/distributions/microsoft/installer.ts

@@ -1,24 +1,24 @@
-import {JavaBase} from '../base-installer';
+import {JavaBase} from '../base-installer.js';
 import {
   JavaDownloadRelease,
   JavaInstallerOptions,
   JavaInstallerResults
-} from '../base-models';
+} from '../base-models.js';
 import {
   extractJdkFile,
   getDownloadArchiveExtension,
   getGitHubHttpHeaders,
   renameWinArchive
-} from '../../util';
+} from '../../util.js';
-import * as gpg from '../../gpg';
+import * as gpg from '../../gpg.js';
-import {MICROSOFT_PUBLIC_KEY} from './microsoft-key';
+import {MICROSOFT_PUBLIC_KEY} from './microsoft-key.js';
 import * as core from '@actions/core';
 import * as tc from '@actions/tool-cache';
 import fs from 'fs';
 import path from 'path';
 import {TypedResponse} from '@actions/http-client/lib/interfaces';
 
-export {MICROSOFT_PUBLIC_KEY} from './microsoft-key';
+export {MICROSOFT_PUBLIC_KEY} from './microsoft-key.js';
 
 export class MicrosoftDistributions extends JavaBase {
   constructor(installerOptions: JavaInstallerOptions) {
@@ -48,7 +48,8 @@ export class MicrosoftDistributions extends JavaBase {
         );
       } catch (error) {
         throw new Error(
-          `Failed to verify signature for Microsoft Build of OpenJDK version ${javaRelease.version}. Signature URL: ${javaRelease.signatureUrl}. Error: ${(error as Error).message}`
+          `Failed to verify signature for Microsoft Build of OpenJDK version ${javaRelease.version}. Signature URL: ${javaRelease.signatureUrl}. Error: ${(error as Error).message}`,
+          {cause: error}
         );
       }
     }

src/distributions/oracle/installer.ts

@@ -4,18 +4,19 @@ import * as tc from '@actions/tool-cache';
 import fs from 'fs';
 import path from 'path';
 
-import {JavaBase} from '../base-installer';
+import {JavaBase} from '../base-installer.js';
 import {
   JavaDownloadRelease,
   JavaInstallerOptions,
   JavaInstallerResults
-} from '../base-models';
+} from '../base-models.js';
 import {
   extractJdkFile,
   getDownloadArchiveExtension,
   renameWinArchive
-} from '../../util';
+} from '../../util.js';
 import {HttpCodes} from '@actions/http-client';
+import {OsVersions} from './models.js';
 
 const ORACLE_DL_BASE = 'https://download.oracle.com/java';
 

src/distributions/sapmachine/installer.ts

@@ -10,14 +10,14 @@ import {
   getDownloadArchiveExtension,
   isVersionSatisfies,
   renameWinArchive
-} from '../../util';
+} from '../../util.js';
-import {JavaBase} from '../base-installer';
+import {JavaBase} from '../base-installer.js';
 import {
   JavaDownloadRelease,
   JavaInstallerOptions,
   JavaInstallerResults
-} from '../base-models';
+} from '../base-models.js';
-import {ISapMachineAllVersions, ISapMachineVersions} from './models';
+import {ISapMachineAllVersions, ISapMachineVersions} from './models.js';
 
 export class SapMachineDistribution extends JavaBase {
   constructor(installerOptions: JavaInstallerOptions) {

src/distributions/semeru/installer.ts

@@ -1,9 +1,9 @@
-import {JavaBase} from '../base-installer';
+import {JavaBase} from '../base-installer.js';
 import {
   JavaDownloadRelease,
   JavaInstallerOptions,
   JavaInstallerResults
-} from '../base-models';
+} from '../base-models.js';
 import semver from 'semver';
 import {
   extractJdkFile,
@@ -13,12 +13,12 @@ import {
   renameWinArchive,
   MAX_PAGINATION_PAGES,
   validatePaginationUrl
-} from '../../util';
+} from '../../util.js';
 import * as core from '@actions/core';
 import * as tc from '@actions/tool-cache';
 import fs from 'fs';
 import path from 'path';
-import {ISemeruAvailableVersions} from './models';
+import {ISemeruAvailableVersions} from './models.js';
 
 const supportedArchitectures = [
   'x64',

src/distributions/temurin/installer.ts

@@ -4,16 +4,16 @@ import * as tc from '@actions/tool-cache';
 import fs from 'fs';
 import path from 'path';
 import semver from 'semver';
-import * as gpg from '../../gpg';
+import * as gpg from '../../gpg.js';
 
-import {ADOPTIUM_PUBLIC_KEY} from './adoptium-key';
+import {ADOPTIUM_PUBLIC_KEY} from './adoptium-key.js';
-import {JavaBase} from '../base-installer';
+import {JavaBase} from '../base-installer.js';
-import {ITemurinAvailableVersions} from './models';
+import {ITemurinAvailableVersions} from './models.js';
 import {
   JavaDownloadRelease,
   JavaInstallerOptions,
   JavaInstallerResults
-} from '../base-models';
+} from '../base-models.js';
 import {
   extractJdkFile,
   getNextPageUrlFromLinkHeader,
@@ -22,9 +22,9 @@ import {
   renameWinArchive,
   MAX_PAGINATION_PAGES,
   validatePaginationUrl
-} from '../../util';
+} from '../../util.js';
 
-export {ADOPTIUM_PUBLIC_KEY} from './adoptium-key';
+export {ADOPTIUM_PUBLIC_KEY} from './adoptium-key.js';
 
 export enum TemurinImplementation {
   Hotspot = 'Hotspot'
@@ -102,7 +102,8 @@ export class TemurinDistribution extends JavaBase {
         throw new Error(
           `Failed to verify signature for Temurin version ${javaRelease.version} from ${javaRelease.signatureUrl}: ${
             (error as Error).message
-          }`
+          }`,
+          {cause: error}
         );
       }
     }

src/distributions/zulu/installer.ts

@@ -5,20 +5,20 @@ import path from 'path';
 import fs from 'fs';
 import semver from 'semver';
 
-import {JavaBase} from '../base-installer';
+import {JavaBase} from '../base-installer.js';
-import {IZuluVersions} from './models';
+import {IZuluVersions} from './models.js';
 import {
   extractJdkFile,
   getDownloadArchiveExtension,
   convertVersionToSemver,
   isVersionSatisfies,
   renameWinArchive
-} from '../../util';
+} from '../../util.js';
 import {
   JavaDownloadRelease,
   JavaInstallerOptions,
   JavaInstallerResults
-} from '../base-models';
+} from '../base-models.js';
 
 export class ZuluDistribution extends JavaBase {
   constructor(installerOptions: JavaInstallerOptions) {

src/gpg.ts

@@ -3,8 +3,8 @@ import * as path from 'path';
 import * as io from '@actions/io';
 import * as exec from '@actions/exec';
 import * as tc from '@actions/tool-cache';
-import * as util from './util';
+import * as util from './util.js';
-import {ExecOptions} from '@actions/exec/lib/interfaces';
+import {ExecOptions} from '@actions/exec';
 
 export const PRIVATE_KEY_FILE = path.join(util.getTempDir(), 'private-key.asc');
 
@@ -86,7 +86,8 @@ export async function verifyPackageSignature(
     throw new Error(
       `Failed to create temporary GPG home directory for signature verification: ${
         (error as Error).message
-      }`
+      }`,
+      {cause: error}
     );
   }
   try {

src/maven-args.ts

@@ -1,11 +1,11 @@
 import * as core from '@actions/core';
-import {getBooleanInput} from './util';
+import {getBooleanInput} from './util.js';
 import {
   INPUT_SHOW_DOWNLOAD_PROGRESS,
   MAVEN_ARGS_ENV,
   MAVEN_NO_TRANSFER_PROGRESS_FLAG,
   MAVEN_NO_TRANSFER_PROGRESS_LONG_FLAG
-} from './constants';
+} from './constants.js';
 
 /**
  * Configures the MAVEN_ARGS environment variable so that Maven suppresses

src/setup-java.ts

@@ -1,18 +1,19 @@
 import fs from 'fs';
 import * as core from '@actions/core';
-import * as auth from './auth';
+import * as auth from './auth.js';
 import {
   getBooleanInput,
   isCacheFeatureAvailable,
   getVersionFromFileContent
-} from './util';
+} from './util.js';
-import * as toolchains from './toolchains';
+import * as toolchains from './toolchains.js';
-import * as constants from './constants';
+import * as constants from './constants.js';
-import {restore} from './cache';
+import {restore} from './cache.js';
 import * as path from 'path';
-import {getJavaDistribution} from './distributions/distribution-factory';
+import {fileURLToPath} from 'url';
-import {JavaInstallerOptions} from './distributions/base-models';
+import {getJavaDistribution} from './distributions/distribution-factory.js';
-import {configureMavenArgs} from './maven-args';
+import {JavaInstallerOptions} from './distributions/base-models.js';
+import {configureMavenArgs} from './maven-args.js';
 
 async function run() {
   try {
@@ -113,7 +114,12 @@ async function run() {
       }
     }
     core.endGroup();
-    const matchersPath = path.join(__dirname, '..', '..', '.github');
+    const matchersPath = path.join(
+      path.dirname(fileURLToPath(import.meta.url)),
+      '..',
+      '..',
+      '.github'
+    );
     core.info(`##[add-matcher]${path.join(matchersPath, 'java.json')}`);
 
     await auth.configureAuthentication();

src/toolchains.ts

@@ -3,9 +3,9 @@ import * as os from 'os';
 import * as path from 'path';
 import * as core from '@actions/core';
 import * as io from '@actions/io';
-import * as constants from './constants';
+import * as constants from './constants.js';
 
-import {getBooleanInput} from './util';
+import {getBooleanInput} from './util.js';
 import {create as xmlCreate} from 'xmlbuilder2';
 
 interface JdkInfo {

src/util.ts

@@ -6,7 +6,10 @@ import * as cache from '@actions/cache';
 import * as core from '@actions/core';
 
 import * as tc from '@actions/tool-cache';
-import {INPUT_JOB_STATUS, DISTRIBUTIONS_ONLY_MAJOR_VERSION} from './constants';
+import {
+  INPUT_JOB_STATUS,
+  DISTRIBUTIONS_ONLY_MAJOR_VERSION
+} from './constants.js';
 import {OutgoingHttpHeaders} from 'http';
 
 export function getTempDir() {

tsconfig.json

@@ -2,8 +2,8 @@
   "compilerOptions": {
     /* Basic Options */
     // "incremental": true,                   /* Enable incremental compilation */
-    "target": "es6",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'. */
+    "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'. */
     // "allowJs": true,                       /* Allow javascript files to be compiled. */
     // "checkJs": true,                       /* Report errors in .js files. */
     "resolveJsonModule": true,
@@ -61,5 +61,5 @@
     // "experimentalDecorators": true,        /* Enables experimental support for ES7 decorators. */
     // "emitDecoratorMetadata": true,         /* Enables experimental support for emitting type metadata for decorators. */
   },
-  "exclude": ["node_modules", "**/*.test.ts"]
+  "exclude": ["node_modules", "**/*.test.ts", "jest.config.ts"]
 }