Initial plan

The Azul Metadata API's `arch=x86` returns both 32-bit (i686) and 64-bit
(x64) packages. Because the two variants share identical java_version and
distro_version, setup-java cannot distinguish them and may resolve an
explicit `architecture: x86` request to a 64-bit JDK (and for Java 21+,
where 32-bit is dropped, x86 silently returns x64 instead of failing).

The legacy Zulu Discovery API used `arch=x86&hw_bitness=32` to target only
32-bit builds. The Metadata API exposes the equivalent via `arch=i686`,
which returns only genuine 32-bit builds with full version parity to the
old behavior. Map x86 -> i686 to restore correct 32-bit resolution.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

.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
-  }
-};

.github/java.json

@@ -21,19 +21,6 @@
                     "message": 4
                 }
             ]
-        },
-        {
-            "owner": "maven-javac",
-            "pattern": [
-                {
-                    "regexp": "^\\[(WARNING|ERROR)\\]\\s+(.+?\\.java):\\[(\\d+),(\\d+)\\]\\s+(.+)$",
-                    "severity": 1,
-                    "file": 2,
-                    "line": 3,
-                    "column": 4,
-                    "message": 5
-                }
-            ]
         }
     ]
 }

.github/workflows/e2e-local-file.yml

@@ -47,7 +47,7 @@ jobs:
         id: setup-java
         with:
           distribution: 'jdkfile'
-          jdk-file: ${{ runner.temp }}/${{ env.LocalFilename }}
+          jdkFile: ${{ runner.temp }}/${{ env.LocalFilename }}
           java-version: '11.0.0-ea'
           architecture: x64
       - name: Verify Java version
@@ -88,7 +88,7 @@ jobs:
         id: setup-java
         with:
           distribution: 'jdkfile'
-          jdk-file: ${{ runner.temp }}/${{ env.LocalFilename }}
+          jdkFile: ${{ runner.temp }}/${{ env.LocalFilename }}
           java-version: '11.0.0-ea'
           architecture: x64
       - name: Verify Java version
@@ -129,7 +129,6 @@ jobs:
         id: setup-java
         with:
           distribution: 'jdkfile'
-          # Intentionally uses the deprecated `jdkFile` alias to keep it covered.
           jdkFile: ${{ runner.temp }}/${{ env.LocalFilename }}
           java-version: '11.0.0-ea'
           architecture: x64

.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"
+    - "argparse" # Python Software Foundation License (PSF), but detected as "other"
+    - "balanced-match"
+    - "brace-expansion"

.licenses/npm/@actions/cache.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: "@actions/cache"
-version: 5.1.0
+version: 6.1.0
 type: npm
 summary: Actions cache lib
 homepage: https://github.com/actions/toolkit/tree/main/packages/cache

.licenses/npm/@actions/core.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: "@actions/core"
-version: 2.0.3
+version: 3.0.1
 type: npm
 summary: Actions core lib
 homepage: https://github.com/actions/toolkit/tree/main/packages/core

.licenses/npm/@actions/exec.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: "@actions/exec"
-version: 2.0.0
+version: 3.0.0
 type: npm
 summary: Actions exec lib
 homepage: https://github.com/actions/toolkit/tree/main/packages/exec

.licenses/npm/@actions/glob-0.6.1.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: "@actions/glob"
-version: 0.5.1
+version: 0.6.1
 type: npm
 summary: Actions glob lib
 homepage: https://github.com/actions/toolkit/tree/main/packages/glob

.licenses/npm/@actions/glob-0.7.0.dep.yml

@@ -0,0 +1,20 @@
+---
+name: "@actions/glob"
+version: 0.7.0
+type: npm
+summary: Actions glob lib
+homepage: https://github.com/actions/toolkit/tree/main/packages/glob
+license: mit
+licenses:
+- sources: LICENSE.md
+  text: |-
+    The MIT License (MIT)
+
+    Copyright 2019 GitHub
+
+    Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+    The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+notices: []

.licenses/npm/@actions/http-client.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: "@actions/http-client"
-version: 3.0.2
+version: 4.0.1
 type: npm
 summary: Actions Http Client
 homepage: https://github.com/actions/toolkit/tree/main/packages/http-client

.licenses/npm/@actions/io.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: "@actions/io"
-version: 2.0.0
+version: 3.0.2
 type: npm
 summary: Actions io lib
 homepage: https://github.com/actions/toolkit/tree/main/packages/io

.licenses/npm/@actions/tool-cache.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: "@actions/tool-cache"
-version: 3.0.1
+version: 4.0.0
 type: npm
 summary: Actions tool-cache lib
 homepage: https://github.com/actions/toolkit/tree/main/packages/tool-cache

.licenses/npm/@azure/core-client.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: "@azure/core-client"
-version: 1.10.1
+version: 1.10.2
 type: npm
 summary: Core library for interfacing with AutoRest generated code
 homepage: https://github.com/Azure/azure-sdk-for-js/blob/main/sdk/core/core-client/

.licenses/npm/@azure/core-http-compat.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: "@azure/core-http-compat"
-version: 2.3.1
+version: 2.4.0
 type: npm
 summary: Core HTTP Compatibility Library to bridge the gap between Core V1 & V2 packages.
 homepage: https://github.com/Azure/azure-sdk-for-js/blob/main/sdk/core/core-compat/

.licenses/npm/@azure/core-rest-pipeline.dep.yml

@@ -1,9 +1,9 @@
 ---
 name: "@azure/core-rest-pipeline"
-version: 1.22.2
+version: 1.24.0
 type: npm
 summary: Isomorphic client library for making HTTP requests in node.js and browser.
-homepage: https://github.com/Azure/azure-sdk-for-js/blob/main/sdk/core/core-rest-pipeline/
+homepage: https://github.com/Azure/azure-sdk-for-js/tree/main/sdk/core/core-rest-pipeline/README.md
 license: mit
 licenses:
 - sources: LICENSE

.licenses/npm/@azure/core-xml.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: "@azure/core-xml"
-version: 1.5.0
+version: 1.5.1
 type: npm
 summary: Core library for interacting with XML payloads
 homepage: https://github.com/Azure/azure-sdk-for-js/blob/main/sdk/core/core-xml/

.licenses/npm/@azure/storage-blob.dep.yml

@@ -1,9 +1,9 @@
 ---
 name: "@azure/storage-blob"
-version: 12.29.1
+version: 12.33.0
 type: npm
 summary: Microsoft Azure Storage SDK for JavaScript - Blob
-homepage: https://github.com/Azure/azure-sdk-for-js/blob/main/sdk/storage/storage-blob/
+homepage: https://github.com/Azure/azure-sdk-for-js/tree/main/sdk/storage/storage-blob/README.md
 license: mit
 licenses:
 - sources: LICENSE

.licenses/npm/@azure/storage-common.dep.yml

@@ -1,9 +1,9 @@
 ---
 name: "@azure/storage-common"
-version: 12.1.1
+version: 12.4.1
 type: npm
 summary: Azure Storage Common Client Library for JavaScript
-homepage: https://github.com/Azure/azure-sdk-for-js/blob/main/sdk/storage/storage-internal-avro/
+homepage: https://github.com/Azure/azure-sdk-for-js/tree/main/sdk/storage/storage-common/README.md
 license: mit
 licenses:
 - sources: LICENSE

.licenses/npm/@typespec/ts-http-runtime.dep.yml

@@ -1,9 +1,9 @@
 ---
 name: "@typespec/ts-http-runtime"
-version: 0.3.2
+version: 0.3.6
 type: npm
 summary: Isomorphic client library for making HTTP requests in node.js and browser.
-homepage: https://github.com/Azure/azure-sdk-for-js/blob/main/sdk/core/ts-http-runtime/
+homepage: https://github.com/Azure/azure-sdk-for-js/tree/main/sdk/core/ts-http-runtime/README.md
 license: mit
 licenses:
 - sources: LICENSE

.licenses/npm/anynum.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: anynum
-version: 1.0.0
+version: 1.0.1
 type: npm
 summary: Normalize all Unicode decimal digits (Devanagari, Arabic, Thai, etc.) to
   ASCII numerals. Zero dependencies, performance-first.
@@ -30,4 +30,6 @@ licenses:
     LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
     OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
     SOFTWARE.
+- sources: README.md
+  text: MIT
 notices: []

.licenses/npm/balanced-match-4.0.4.dep.yml

@@ -0,0 +1,34 @@
+---
+name: balanced-match
+version: 4.0.4
+type: npm
+summary: Match balanced character pairs, like "{" and "}"
+homepage:
+license: other
+licenses:
+- sources: LICENSE.md
+  text: |
+    (MIT)
+
+    Original code Copyright Julian Gruber <julian@juliangruber.com>
+
+    Port to TypeScript Copyright Isaac Z. Schlueter <i@izs.me>
+
+    Permission is hereby granted, free of charge, to any person obtaining a copy of
+    this software and associated documentation files (the "Software"), to deal in
+    the Software without restriction, including without limitation the rights to
+    use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+    of the Software, and to permit persons to whom the Software is furnished to do
+    so, subject to the following conditions:
+
+    The above copyright notice and this permission notice shall be included in all
+    copies or substantial portions of the Software.
+
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+    SOFTWARE.
+notices: []

.licenses/npm/brace-expansion-1.1.15.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: brace-expansion
-version: 1.1.13
+version: 1.1.15
 type: npm
 summary: Brace expansion as known from sh/bash
 homepage: https://github.com/juliangruber/brace-expansion

.licenses/npm/brace-expansion-5.0.7.dep.yml

@@ -0,0 +1,34 @@
+---
+name: brace-expansion
+version: 5.0.7
+type: npm
+summary: Brace expansion as known from sh/bash
+homepage:
+license: other
+licenses:
+- sources: LICENSE
+  text: |
+    MIT License
+
+    Copyright Julian Gruber <julian@juliangruber.com>
+
+    TypeScript port Copyright Isaac Z. Schlueter <i@izs.me>
+
+    Permission is hereby granted, free of charge, to any person obtaining a copy
+    of this software and associated documentation files (the "Software"), to deal
+    in the Software without restriction, including without limitation the rights
+    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+    copies of the Software, and to permit persons to whom the Software is
+    furnished to do so, subject to the following conditions:
+
+    The above copyright notice and this permission notice shall be included in all
+    copies or substantial portions of the Software.
+
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+    SOFTWARE.
+notices: []

.licenses/npm/fast-xml-builder.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: fast-xml-builder
-version: 1.2.0
+version: 1.2.1
 type: npm
 summary: Build XML from JSON without C/C++ based libraries
 homepage:

.licenses/npm/fast-xml-parser.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: fast-xml-parser
-version: 5.8.0
+version: 5.9.3
 type: npm
 summary: Validate XML, Parse XML, Build XML without C/C++ based libraries
 homepage:

.licenses/npm/is-unsafe.dep.yml

@@ -1,16 +1,17 @@
 ---
-name: "@azure/abort-controller"
-version: 1.1.0
+name: is-unsafe
+version: 1.0.1
 type: npm
-summary: Microsoft Azure SDK for JavaScript - Aborter
-homepage: https://github.com/Azure/azure-sdk-for-js/tree/main/sdk/core/abort-controller/README.md
+summary: Zero-dependency, DOM-free, pure predicate for detecting unsafe strings across
+  HTML, XML, SVG, SQL, SHELL, and REGEX contexts
+homepage:
 license: mit
 licenses:
 - sources: LICENSE
   text: |
-    The MIT License (MIT)
+    MIT License
 
-    Copyright (c) 2020 Microsoft
+    Copyright (c) 2026 Natural Intelligence
 
     Permission is hereby granted, free of charge, to any person obtaining a copy
     of this software and associated documentation files (the "Software"), to deal
@@ -29,4 +30,6 @@ licenses:
     LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
     OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
     SOFTWARE.
+- sources: README.md
+  text: MIT
 notices: []

.licenses/npm/js-yaml.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: js-yaml
-version: 4.1.1
+version: 4.3.0
 type: npm
 summary: YAML 1.2 parser and serializer
 homepage:

.licenses/npm/minimatch-10.2.5.dep.yml

@@ -0,0 +1,66 @@
+---
+name: minimatch
+version: 10.2.5
+type: npm
+summary: a glob matcher in javascript
+homepage:
+license: blueoak-1.0.0
+licenses:
+- sources: LICENSE.md
+  text: |
+    # Blue Oak Model License
+
+    Version 1.0.0
+
+    ## Purpose
+
+    This license gives everyone as much permission to work with
+    this software as possible, while protecting contributors
+    from liability.
+
+    ## Acceptance
+
+    In order to receive this license, you must agree to its
+    rules. The rules of this license are both obligations
+    under that agreement and conditions to your license.
+    You must not do anything with this software that triggers
+    a rule that you cannot or will not follow.
+
+    ## Copyright
+
+    Each contributor licenses you to do everything with this
+    software that would otherwise infringe that contributor's
+    copyright in it.
+
+    ## Notices
+
+    You must ensure that everyone who gets a copy of
+    any part of this software from you, with or without
+    changes, also gets the text of this license or a link to
+    <https://blueoakcouncil.org/license/1.0.0>.
+
+    ## Excuse
+
+    If anyone notifies you in writing that you have not
+    complied with [Notices](#notices), you can keep your
+    license by taking all practical steps to comply within 30
+    days after the notice. If you do not do so, your license
+    ends immediately.
+
+    ## Patent
+
+    Each contributor licenses you to do everything with this
+    software that would otherwise infringe any patent claims
+    they can license or become able to license.
+
+    ## Reliability
+
+    No contributor can revoke this license.
+
+    ## No Liability
+
+    **_As far as the law allows, this software comes as is,
+    without any warranty or condition, and no contributor
+    will be liable to anyone for any damages related to this
+    software or this license, under any kind of legal claim._**
+notices: []

.licenses/npm/path-expression-matcher.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: path-expression-matcher
-version: 1.5.0
+version: 1.6.1
 type: npm
 summary: Efficient path tracking and pattern matching for XML/JSON parsers
 homepage: https://github.com/NaturalIntelligence/path-expression-matcher#readme

.licenses/npm/semver-6.3.1.dep.yml

@@ -1,26 +0,0 @@
----
-name: semver
-version: 6.3.1
-type: npm
-summary: The semantic version parser used by npm.
-homepage: 
-license: isc
-licenses:
-- sources: LICENSE
-  text: |
-    The ISC License
-
-    Copyright (c) Isaac Z. Schlueter and Contributors
-
-    Permission to use, copy, modify, and/or distribute this software for any
-    purpose with or without fee is hereby granted, provided that the above
-    copyright notice and this permission notice appear in all copies.
-
-    THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
-    WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-    MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
-    ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
-    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
-    IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-notices: []

.licenses/npm/semver.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: semver
-version: 7.8.4
+version: 7.8.5
 type: npm
 summary: The semantic version parser used by npm.
 homepage:

.licenses/npm/strnum.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: strnum
-version: 2.4.0
+version: 2.4.1
 type: npm
 summary: Parse String to Number based on configuration
 homepage:

.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
@@ -37,7 +41,7 @@ For more details,  see the full release notes on the [releases page](https://git
 
   - `architecture`: The target architecture of the package. Possible values: `x86`, `x64`, `armv7`, `aarch64`, `ppc64le`. Default value: Derived from the runner machine.
 
-  - `jdk-file`: If a use-case requires a custom distribution setup-java uses the compressed JDK from the location pointed by this input and will take care of the installation and caching on the VM. Note: `distribution` must be set to 'jdkfile' (case-sensitive; all lowercase) when using this option. (The camelCase `jdkFile` input is still accepted as a deprecated alias and may be removed in a future release.)
+  - `jdkFile`: If a use-case requires a custom distribution setup-java uses the compressed JDK from the location pointed by this input and will take care of the installation and caching on the VM. Note: `distribution` must be set to 'jdkfile' (case-sensitive; all lowercase) when using this option.
 
   - `check-latest`: Setting this option makes the action to check for the latest available version for the version spec.
 
@@ -145,8 +149,6 @@ When the option `cache-dependency-path` is specified, the hash is based on the m
 
 The workflow output `cache-hit` is set to indicate if an exact match was found for the key [as actions/cache does](https://github.com/actions/cache/tree/main#outputs).
 
-The workflow output `cache-primary-key` exposes the primary cache key computed by the action for the configured build tool. It is useful for composing with [`actions/cache`](https://github.com/actions/cache) or [`actions/cache/restore`](https://github.com/actions/cache/tree/main/restore) in later steps or dependent jobs that need to reuse the exact same key. It is empty when caching is not enabled or when caching is skipped (for example, when the cache service is unavailable).
-
 The cache input is optional, and caching is turned off by default.
 
 **Maven Wrapper:** when `cache: 'maven'` is enabled, the action also caches and restores the Maven Wrapper distribution downloaded to `~/.m2/wrapper/dists` (in addition to the local repository), so wrapper-based (`./mvnw`) builds don't re-download the wrapper on every run. This is keyed on `**/.mvn/wrapper/maven-wrapper.properties` as shown above.

__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';
-import {M2_DIR, MVN_SETTINGS_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 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 spyInfo: jest.SpyInstance;
+  let spyOSHomedir: any;
+  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';
-import * as glob from '@actions/glob';
+
+// 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/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 spyWarning: jest.SpyInstance<void, Parameters<typeof core.warning>>;
-  let spyDebug: jest.SpyInstance<void, Parameters<typeof core.debug>>;
-  let spySaveState: jest.SpyInstance<void, Parameters<typeof core.saveState>>;
-  let spyCoreError: jest.SpyInstance;
+  let spyInfo: any;
+  let spyWarning: any;
+  let spyDebug: any;
+  let spySaveState: any;
+  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(() => {});
   });
 
@@ -70,27 +131,15 @@ describe('dependency cache', () => {
   });
 
   describe('restore', () => {
-    let spyCacheRestore: jest.SpyInstance<
-      ReturnType<typeof cache.restoreCache>,
-      Parameters<typeof cache.restoreCache>
-    >;
-    let spyGlobHashFiles: jest.SpyInstance<
-      ReturnType<typeof glob.hashFiles>,
-      Parameters<typeof glob.hashFiles>
-    >;
-    let spySetOutput: jest.SpyInstance<
-      ReturnType<typeof core.setOutput>,
-      Parameters<typeof core.setOutput>
-    >;
+    let spyCacheRestore: any;
+    let spyGlobHashFiles: any;
 
     beforeEach(() => {
-      spyCacheRestore = jest
-        .spyOn(cache, 'restoreCache')
-        .mockImplementation((paths: string[], primaryKey: string) =>
-          Promise.resolve(undefined)
-        );
-      spyGlobHashFiles = jest.spyOn(glob, 'hashFiles');
-      spySetOutput = jest.spyOn(core, 'setOutput').mockImplementation(() => {});
+      spyCacheRestore = (cache.restoreCache as any).mockImplementation(
+        (paths: string[], primaryKey: string) => Promise.resolve(undefined)
+      );
+      spyGlobHashFiles = glob.hashFiles as jest.Mock;
+      spyGlobHashFiles.mockResolvedValue('hash-stub');
       spyWarning.mockImplementation(() => null);
     });
 
@@ -102,6 +151,7 @@ describe('dependency cache', () => {
 
     describe('for maven', () => {
       it('throws error if no pom.xml, maven-wrapper.properties, or extensions.xml found', async () => {
+        spyGlobHashFiles.mockResolvedValue('');
         await expect(restore('maven', '')).rejects.toThrow(
           `No file in ${projectRoot(
             workspace
@@ -125,15 +175,6 @@ describe('dependency cache', () => {
         expect(spyWarning).not.toHaveBeenCalled();
         expect(spyInfo).toHaveBeenCalledWith('maven cache is not found');
       });
-      it('sets the cache-primary-key output', async () => {
-        createFile(join(workspace, 'pom.xml'));
-
-        await restore('maven', '');
-        expect(spySetOutput).toHaveBeenCalledWith(
-          'cache-primary-key',
-          expect.stringContaining('setup-java-')
-        );
-      });
       it('downloads cache based on maven-wrapper.properties', async () => {
         createDirectory(join(workspace, '.mvn'));
         createDirectory(join(workspace, '.mvn', 'wrapper'));
@@ -176,6 +217,7 @@ 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
@@ -231,6 +273,7 @@ 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
@@ -249,6 +292,13 @@ 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'));
@@ -284,6 +334,7 @@ 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')
@@ -325,17 +376,12 @@ describe('dependency cache', () => {
     });
   });
   describe('save', () => {
-    let spyCacheSave: jest.SpyInstance<
-      ReturnType<typeof cache.saveCache>,
-      Parameters<typeof cache.saveCache>
-    >;
+    let spyCacheSave: any;
 
     beforeEach(() => {
-      spyCacheSave = jest
-        .spyOn(cache, 'saveCache')
-        .mockImplementation((paths: string[], key: string) =>
-          Promise.resolve(0)
-        );
+      spyCacheSave = (cache.saveCache as any).mockImplementation(
+        (paths: string[], key: string) => Promise.resolve(0)
+      );
       spyWarning.mockImplementation(() => null);
     });
 
@@ -495,14 +541,14 @@ 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-';
@@ -516,7 +562,7 @@ 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 * as core from '@actions/core';
-import * as cache from '@actions/cache';
-import * as util from '../src/util';
+import {
+  jest,
+  describe,
+  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 spyInfo: jest.SpyInstance<void, Parameters<typeof core.info>>;
-  let spyCacheSave: jest.SpyInstance<
-    ReturnType<typeof cache.saveCache>,
-    Parameters<typeof cache.saveCache>
-  >;
-  let spyJobStatusSuccess: jest.SpyInstance;
-  let spyCoreError: jest.SpyInstance;
+  let spyWarning: any;
+  let spyInfo: any;
+  let spyCacheSave: any;
+  let spyJobStatusSuccess: any;
+  let spyCoreError: any;
 
   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,
-  AdoptImplementation
-} from '../../src/distributions/adopt/installer';
-import {TemurinDistribution} from '../../src/distributions/temurin/installer';
-import {JavaInstallerOptions} from '../../src/distributions/base-models';
-
+  jest,
+  describe,
+  it,
+  expect,
+  beforeEach,
+  afterEach,
+  beforeAll,
+  afterAll
+} from '@jest/globals';
+import {HttpClient} from '@actions/http-client';
 import os from 'os';
 
-import manifestData from '../data/adopt.json';
-import * as core from '@actions/core';
+import manifestData from '../data/adopt.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 {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 spyCoreError: jest.SpyInstance;
-  let spyCoreWarning: jest.SpyInstance;
+  let spyHttpClient: any;
+  let spyCoreError: any;
+  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 * as core from '@actions/core';
-import * as util from '../../src/util';
+import {
+  jest,
+  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 spyTcFindAllVersions: jest.SpyInstance;
+  let spyGetToolcachePath: any;
+  let spyTcFindAllVersions: any;
 
   beforeEach(() => {
-    spyGetToolcachePath = jest.spyOn(util, 'getToolcachePath');
-    spyTcFindAllVersions = jest.spyOn(tc, 'findAllVersions');
+    spyGetToolcachePath = util.getToolcachePath as jest.Mock;
+    spyTcFindAllVersions = tc.findAllVersions as jest.Mock;
   });
 
   afterEach(() => {
@@ -241,17 +312,17 @@ describe('setupJava', () => {
 
   let mockJavaBase: EmptyJavaBase;
 
-  let spyGetToolcachePath: jest.SpyInstance;
-  let spyTcFindAllVersions: jest.SpyInstance;
-  let spyCoreDebug: jest.SpyInstance;
-  let spyCoreInfo: jest.SpyInstance;
-  let spyCoreExportVariable: jest.SpyInstance;
-  let spyCoreAddPath: jest.SpyInstance;
-  let spyCoreSetOutput: jest.SpyInstance;
-  let spyCoreError: jest.SpyInstance;
+  let spyGetToolcachePath: any;
+  let spyTcFindAllVersions: any;
+  let spyCoreDebug: any;
+  let spyCoreInfo: any;
+  let spyCoreExportVariable: any;
+  let spyCoreAddPath: any;
+  let spyCoreSetOutput: any;
+  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 spyGetDownloadArchiveExtension: jest.SpyInstance;
-  let spyCoreError: jest.SpyInstance;
+  let spyHttpClient: ReturnType<typeof jest.spyOn>;
+  let spyGetDownloadArchiveExtension: any;
+  let spyCoreError: any;
 
   beforeEach(() => {
     spyHttpClient = jest.spyOn(HttpClient.prototype, 'getJson');
@@ -20,13 +65,11 @@ describe('getAvailableVersions', () => {
       headers: {},
       result: manifestData
     });
-    spyGetDownloadArchiveExtension = jest.spyOn(
-      util,
-      'getDownloadArchiveExtension'
-    );
+    spyGetDownloadArchiveExtension =
+      util.getDownloadArchiveExtension as jest.Mock;
 
     // 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 spyUtilGetDownloadArchiveExtension: jest.SpyInstance;
-  let spyCoreError: jest.SpyInstance;
+  let spyHttpClient: any;
+  let spyUtilGetDownloadArchiveExtension: any;
+  let spyCoreError: any;
 
   beforeEach(() => {
     spyHttpClient = jest.spyOn(HttpClient.prototype, 'getJson');
@@ -18,14 +63,12 @@ describe('getAvailableVersions', () => {
       result: manifestData
     });
 
-    spyUtilGetDownloadArchiveExtension = jest.spyOn(
-      utils,
-      'getDownloadArchiveExtension'
-    );
+    spyUtilGetDownloadArchiveExtension =
+      utils.getDownloadArchiveExtension as jest.Mock;
     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,
-  GraalVMDistribution
-} from '../../src/distributions/graalvm/installer';
-import {getJavaDistribution} from '../../src/distributions/distribution-factory';
-import {JavaInstallerOptions} from '../../src/distributions/base-models';
-import * as util from '../../src/util';
+  jest,
+  describe,
+  it,
+  expect,
+  beforeEach,
+  beforeAll,
+  afterAll
+} from '@jest/globals';
+import path from 'path';
 
-jest.mock('@actions/core');
-jest.mock('@actions/tool-cache');
-jest.mock('@actions/http-client');
+// Mock @actions modules
+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.mock('../../src/util', () => ({
-  ...jest.requireActual('../../src/util'),
+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()
+}));
+
+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', () => ({
-  ...jest.requireActual('fs'),
+const real_fs_module = await import('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 communityDistribution: GraalVMCommunityDistribution;
-  let mockHttpClient: jest.Mocked<http.HttpClient>;
-  let spyCoreError: jest.SpyInstance;
+  let distribution: InstanceType<typeof GraalVMDistribution>;
+  let communityDistribution: InstanceType<typeof GraalVMCommunityDistribution>;
+  let mockHttpClient: any;
+  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.cacheDir as jest.Mock).mockResolvedValue('/cached/java/path');
+      (tc.downloadTool as any).mockResolvedValue('/tmp/archive.tar.gz');
+      (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.readdirSync as jest.Mock).mockReturnValue([]);
+      (fs.existsSync as jest.Mock<any>).mockReturnValue(true);
+      (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');
-      (tc.downloadTool as jest.Mock).mockResolvedValue('/tmp/archive.zip');
+      (util.getDownloadArchiveExtension as jest.Mock<any>).mockReturnValue(
+        '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 spyCoreError: jest.SpyInstance;
+  let spyHttpClient: any;
+  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(() => {});
   });
 
@@ -31,11 +70,17 @@ describe('getAvailableVersions', () => {
 
   it('load available versions', async () => {
     spyHttpClient = jest.spyOn(HttpClient.prototype, 'getJson');
-    spyHttpClient.mockReturnValueOnce({
-      statusCode: 200,
-      headers: {},
-      result: manifestData as any
-    });
+    spyHttpClient
+      .mockReturnValueOnce({
+        statusCode: 200,
+        headers: {},
+        result: manifestData as any
+      })
+      .mockReturnValue({
+        statusCode: 200,
+        headers: {},
+        result: []
+      });
 
     const distribution = new JetBrainsDistribution({
       version: '17',

__tests__/distributors/kona-installer.test.ts

@@ -1,6 +1,6 @@
-import {KonaDistribution} from '../../src/distributions/kona/installer';
+import {KonaDistribution} from '../../src/distributions/kona/installer.js';
 
-import manifestData from '../data/kona.json';
+import manifestData from '../data/kona.json' with {type: 'json'};
 
 function mockDistr(
   version: string,

__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 spyCoreError: jest.SpyInstance;
+  let spyHttpClient: any;
+  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 spyCoreError: jest.SpyInstance;
+  let spyHttpClient: any;
+  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 spyCoreError: jest.SpyInstance;
+  let spyHttpClient: any;
+  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 spyTcCacheDir: jest.SpyInstance;
-  let spyTcFindAllVersions: jest.SpyInstance;
-  let spyCoreDebug: jest.SpyInstance;
-  let spyCoreInfo: jest.SpyInstance;
-  let spyCoreExportVariable: jest.SpyInstance;
-  let spyCoreAddPath: jest.SpyInstance;
-  let spyCoreSetOutput: jest.SpyInstance;
-  let spyFsStat: jest.SpyInstance;
-  let spyFsReadDir: jest.SpyInstance;
-  let spyUtilsExtractJdkFile: jest.SpyInstance;
-  let spyPathResolve: jest.SpyInstance;
-  let spyCoreError: jest.SpyInstance;
+  let spyGetToolcachePath: any;
+  let spyTcCacheDir: any;
+  let spyTcFindAllVersions: any;
+  let spyCoreDebug: any;
+  let spyCoreInfo: any;
+  let spyCoreExportVariable: any;
+  let spyCoreAddPath: any;
+  let spyCoreSetOutput: any;
+  let spyFsStat: any;
+  let spyFsReadDir: any;
+  let spyUtilsExtractJdkFile: any;
+  let spyPathResolve: any;
+  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,
-  MICROSOFT_PUBLIC_KEY
-} from '../../src/distributions/microsoft/installer';
-import os from 'os';
-import data from '../data/microsoft.json';
-import * as httpm from '@actions/http-client';
-import * as core from '@actions/core';
-import * as tc from '@actions/tool-cache';
-import * as gpg from '../../src/gpg';
-import * as util from '../../src/util';
-import fs from 'fs';
+  jest,
+  describe,
+  it,
+  expect,
+  beforeEach,
+  afterEach,
+  beforeAll,
+  afterAll
+} from '@jest/globals';
+import {HttpClient} from '@actions/http-client';
+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 spyGetManifestFromRepo: jest.SpyInstance;
-  let spyDebug: jest.SpyInstance;
-  let spyCoreError: jest.SpyInstance;
+  let distribution: InstanceType<typeof MicrosoftDistributions>;
+  let spyGetManifestFromRepo: any;
+  let spyDebug: any;
+  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
-        .spyOn(os, 'arch')
-        .mockReturnValue(osArch as ReturnType<typeof os.arch>);
-      jest.spyOn(os, 'platform').mockReturnValue('darwin');
+      mockOsArch.mockReturnValue(osArch);
+      mockOsPlatform.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
-        .spyOn(os, 'arch')
-        .mockReturnValue(osArch as ReturnType<typeof os.arch>);
-      jest.spyOn(os, 'platform').mockReturnValue('linux');
+      mockOsArch.mockReturnValue(osArch);
+      mockOsPlatform.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
-        .spyOn(os, 'arch')
-        .mockReturnValue(osArch as ReturnType<typeof os.arch>);
-      jest.spyOn(os, 'platform').mockReturnValue('win32');
+      mockOsArch.mockReturnValue(osArch);
+      mockOsPlatform.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 spyExtractJdkFile: jest.SpyInstance;
-  let spyCacheDir: jest.SpyInstance;
-  let spyVerifySignature: jest.SpyInstance;
-  let distribution: MicrosoftDistributions;
+  let spyDownloadTool: any;
+  let spyExtractJdkFile: any;
+  let spyCacheDir: any;
+  let spyVerifySignature: any;
+  let distribution: InstanceType<typeof MicrosoftDistributions>;
 
   beforeEach(() => {
-    jest
-      .spyOn(os, 'platform')
-      .mockReturnValue(process.platform as ReturnType<typeof os.platform>);
+    mockOsPlatform.mockReturnValue(process.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);
-    spyCacheDir = jest.spyOn(tc, 'cacheDir');
+    mockReaddirSync.mockReturnValue(['jdk'] as any);
+    spyCacheDir = tc.cacheDir as jest.Mock;
     spyCacheDir.mockImplementation(async () => {
       return '/tmp/cached';
     });
 
-    jest
-      .spyOn(util, 'renameWinArchive')
-      .mockImplementation((archivePath: string) => `${archivePath}.zip`);
+    (util.renameWinArchive as jest.Mock<any>).mockImplementation(
+      (archivePath: string) => `${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 spyDebug: jest.SpyInstance;
-  let spyHttpClient: jest.SpyInstance;
-  let spyCoreError: jest.SpyInstance;
+  let distribution: InstanceType<typeof OracleDistribution>;
+  let spyDebug: any;
+  let spyHttpClient: any;
+  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 spyUtilGetDownloadArchiveExtension: jest.SpyInstance;
-  let spyCoreError: jest.SpyInstance;
+  let spyHttpClient: any;
+  let spyUtilGetDownloadArchiveExtension: any;
+  let spyCoreError: any;
 
   beforeEach(() => {
     spyHttpClient = jest.spyOn(HttpClient.prototype, 'getJson');
@@ -18,14 +63,12 @@ describe('getAvailableVersions', () => {
       result: manifestData
     });
 
-    spyUtilGetDownloadArchiveExtension = jest.spyOn(
-      utils,
-      'getDownloadArchiveExtension'
-    );
+    spyUtilGetDownloadArchiveExtension =
+      utils.getDownloadArchiveExtension as jest.Mock<any>;
     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 {SemeruDistribution} from '../../src/distributions/semeru/installer';
+import manifestData from '../data/semeru.json' with {type: 'json'};
 
-import manifestData from '../data/semeru.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 {SemeruDistribution} =
+  await import('../../src/distributions/semeru/installer.js');
 
 describe('getAvailableVersions', () => {
-  let spyHttpClient: jest.SpyInstance;
-  let spyCoreError: jest.SpyInstance;
-  let spyCoreWarning: jest.SpyInstance;
+  let spyHttpClient: any;
+  let spyCoreError: any;
+  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 * as core from '@actions/core';
+import manifestData from '../data/temurin.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)
+}));
+
+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 spyCoreError: jest.SpyInstance;
-  let spyCoreWarning: jest.SpyInstance;
+  let spyHttpClient: any;
+  let spyCoreError: any;
+  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 spyVerifySignature: jest.SpyInstance;
-  let spyExtractJdkFile: jest.SpyInstance;
-  let spyCacheDir: jest.SpyInstance;
-  let spyReadDirSync: jest.SpyInstance;
-  let spyRenameWinArchive: jest.SpyInstance;
+  let spyDownloadTool: any;
+  let spyVerifySignature: any;
+  let spyExtractJdkFile: any;
+  let spyCacheDir: any;
+  let spyReadDirSync: any;
+  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 spyUtilGetDownloadArchiveExtension: jest.SpyInstance;
-  let spyCoreError: jest.SpyInstance;
+  let spyHttpClient: any;
+  let spyCoreError: any;
 
   beforeEach(() => {
     spyHttpClient = jest.spyOn(HttpClient.prototype, 'getJson');
@@ -20,14 +64,12 @@ describe('getAvailableVersions', () => {
       result: [] as IZuluVersions[]
     });
 
-    spyUtilGetDownloadArchiveExtension = jest.spyOn(
-      utils,
-      'getDownloadArchiveExtension'
+    (utils.getDownloadArchiveExtension as jest.Mock<any>).mockReturnValue(
+      'tar.gz'
     );
-    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 spyUtilGetDownloadArchiveExtension: jest.SpyInstance;
-  let spyCoreError: jest.SpyInstance;
+  let spyHttpClient: any;
+  let spyUtilGetDownloadArchiveExtension: any;
+  let spyCoreError: any;
 
   beforeEach(() => {
     spyHttpClient = jest.spyOn(HttpClient.prototype, 'getJson');
@@ -21,14 +66,12 @@ describe('getAvailableVersions', () => {
       result: [] as IZuluVersions[]
     });
 
-    spyUtilGetDownloadArchiveExtension = jest.spyOn(
-      utils,
-      'getDownloadArchiveExtension'
-    );
+    spyUtilGetDownloadArchiveExtension =
+      utils.getDownloadArchiveExtension as jest.Mock<any>;
     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 spyUtilGetDownloadArchiveExtension: jest.SpyInstance;
-  let spyCoreError: jest.SpyInstance;
+  let spyHttpClient: any;
+  let spyCoreError: any;
 
   beforeEach(() => {
     spyHttpClient = jest.spyOn(HttpClient.prototype, 'getJson');
@@ -21,14 +65,12 @@ describe('getAvailableVersions', () => {
       result: [] as IZuluVersions[]
     });
 
-    spyUtilGetDownloadArchiveExtension = jest.spyOn(
-      utils,
-      'getDownloadArchiveExtension'
+    (utils.getDownloadArchiveExtension as jest.Mock<any>).mockReturnValue(
+      'zip'
     );
-    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', () => {
-  return {
-    exec: jest.fn()
-  };
-});
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
 
-jest.mock('@actions/tool-cache', () => {
-  return {
-    downloadTool: jest.fn()
-  };
-});
+jest.unstable_mockModule('@actions/exec', () => ({
+  exec: jest.fn()
+}));
+
+jest.unstable_mockModule('@actions/tool-cache', () => ({
+  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';
-import {
+const mockGetInput = jest.fn<(...args: any[]) => any>();
+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');
-    spyGetInput.mockImplementation((name: string) => inputs[name] ?? '');
-
-    spyExportVariable = jest.spyOn(core, 'exportVariable');
-    spyExportVariable.mockImplementation((name: string, value: string) => {
+    mockGetInput.mockImplementation((name: string) => inputs[name] ?? '');
+    mockExportVariable.mockImplementation((name: string, value: string) => {
       process.env[name] = value;
     });
-
-    spyInfo = jest.spyOn(core, 'info');
-    spyInfo.mockImplementation(() => undefined);
-
-    spyDebug = jest.spyOn(core, 'debug');
-    spyDebug.mockImplementation(() => undefined);
+    mockInfo.mockImplementation(() => undefined);
+    mockDebug.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 spyInfo: jest.SpyInstance;
+  let spyOSHomedir: any;
+  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 * as core from '@actions/core';
+import {
+  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';
-
-jest.mock('@actions/cache');
-jest.mock('@actions/core');
+} = await import('../src/util.js');
 
 describe('isVersionSatisfies', () => {
   it.each([
@@ -45,8 +89,10 @@ describe('isVersionSatisfies', () => {
 
 describe('isCacheFeatureAvailable', () => {
   it('isCacheFeatureAvailable disabled on GHES', () => {
-    jest.spyOn(cache, 'isFeatureAvailable').mockImplementation(() => false);
-    const infoMock = jest.spyOn(core, 'warning');
+    (cache.isFeatureAvailable as jest.Mock<any>).mockImplementation(
+      () => 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);
-    const infoMock = jest.spyOn(core, 'warning');
+    (cache.isFeatureAvailable as jest.Mock<any>).mockImplementation(
+      () => 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', () => {
@@ -243,79 +296,12 @@ describe('getVersionFromFileContent', () => {
       );
     });
   });
-
-  describe('.tool-versions', () => {
-    it.each([
-      ['java temurin-17.0.3+7', '17.0.3+7', 'temurin'],
-      ['java temurin-jre-17.0.3+7', '17.0.3+7', 'temurin'],
-      ['java adoptopenjdk-11.0.16+8', '11.0.16+8', 'temurin'],
-      ['java adoptopenjdk-openj9-11.0.16+8', '11.0.16+8', 'temurin'],
-      ['java zulu-11.56.19', '11.56.19', 'zulu'],
-      ['java corretto-17.0.13.11.1', '17', 'corretto'], // corretto -> major only
-      ['java liberica-11.0.15+10', '11.0.15+10', 'liberica'],
-      ['java microsoft-11.0.13.8.1', '11.0.13', 'microsoft'],
-      ['java semeru-openj9-11.0.25+9', '11.0.25+9', 'semeru'],
-      ['java ibm-openj9-11.0.25+9', '11.0.25+9', 'semeru'],
-      ['java dragonwell-17.0.13.0.13+11', '17.0.13', 'dragonwell'],
-      ['java graalvm-22.3.0+java17', '22.3.0+java17', 'graalvm'],
-      ['java graalvm-community-22.3.0', '22.3.0', 'graalvm-community'],
-      ['java oracle-graalvm-21.0.5', '21.0.5', 'graalvm'],
-      ['java oracle-21.0.5', '21.0.5', 'oracle'],
-      ['java sapmachine-21.0.5', '21.0.5', 'sapmachine'],
-      ['java kona-17.0.13', '17.0.13', 'kona'],
-      ['java jetbrains-21.0.5', '21.0.5', 'jetbrains']
-    ])(
-      'parsing %s should return version %s and distribution %s',
-      (content: string, expectedVersion: string, expectedDist: string) => {
-        const actual = getVersionFromFileContent(
-          content,
-          'openjdk',
-          '.tool-versions'
-        );
-        expect(actual?.version).toBe(expectedVersion);
-        expect(actual?.distribution).toBe(expectedDist);
-      }
-    );
-
-    it.each([
-      ['java 17.0.7', '17.0.7'],
-      ['java 17', '17'],
-      ['java 1.8', '8'],
-      ['java 21-ea', '21-ea']
-    ])(
-      'parsing prefix-less %s should return version %s and no distribution',
-      (content: string, expectedVersion: string) => {
-        const actual = getVersionFromFileContent(
-          content,
-          'temurin',
-          '.tool-versions'
-        );
-        expect(actual?.version).toBe(expectedVersion);
-        expect(actual?.distribution).toBeUndefined();
-      }
-    );
-
-    it('should warn and return undefined distribution for unsupported vendor', () => {
-      const warnSpy = jest.spyOn(core, 'warning');
-      const actual = getVersionFromFileContent(
-        'java openjdk-17.0.7',
-        'temurin',
-        '.tool-versions'
-      );
-      expect(actual?.version).toBe('17.0.7');
-      expect(actual?.distribution).toBeUndefined();
-      expect(warnSpy).toHaveBeenCalledWith(
-        expect.stringContaining('Unknown asdf distribution identifier')
-      );
-    });
-  });
 });
 
 describe('isGhes', () => {
   const pristineEnv = process.env;
 
   beforeEach(() => {
-    jest.resetModules();
     process.env = {...pristineEnv};
   });
 

action.yml

@@ -19,13 +19,9 @@ inputs:
   architecture:
     description: "The architecture of the package (defaults to the action runner's architecture)"
     required: false
-  jdk-file:
+  jdkFile:
     description: 'Path to where the compressed JDK is located'
     required: false
-  jdkFile:
-    description: 'Deprecated alias for `jdk-file`. Path to where the compressed JDK is located. Use `jdk-file` instead; this alias may be removed in a future release.'
-    required: false
-    deprecationMessage: 'The `jdkFile` input is deprecated. Use `jdk-file` instead.'
   check-latest:
     description: 'Set this option if you want the action to check for the latest available version that satisfies the version spec'
     required: false
@@ -103,8 +99,6 @@ outputs:
     description: 'Path to where the java environment has been installed (same as $JAVA_HOME)'
   cache-hit:
     description: 'A boolean value to indicate an exact match was found for the primary key'
-  cache-primary-key:
-    description: 'The primary cache key computed by the action for the configured build tool. Empty when caching is not enabled or when caching is skipped (e.g. cache service unavailable). Useful for composing with actions/cache or actions/cache/restore across jobs.'
 runs:
   using: 'node24'
   main: 'dist/setup/index.js'

dist/cleanup/package.json

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

dist/setup/package.json

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

docs/advanced-usage.md

@@ -330,7 +330,7 @@ In this example, `JAVA_HOME` and `java` on `PATH` point to Java 17, while Java 2
 If your use-case requires a custom distribution or a version that is not provided by setup-java, you can download it manually and setup-java will take care of the installation and caching on the VM:
 
 > [!NOTE]
-> This approach also lets you use builds that setup-java does not provide directly, such as **Early Access (EA)** or other unreleased JDK builds (for example, an upcoming feature release or a Loom/Valhalla preview build). Download the desired archive in a prior step and point `jdk-file` at it; setup-java will extract, install, and cache it just like a supported distribution. When targeting multiple architectures, select the correct binary per architecture in your workflow (for example, with a build matrix).
+> This approach also lets you use builds that setup-java does not provide directly, such as **Early Access (EA)** or other unreleased JDK builds (for example, an upcoming feature release or a Loom/Valhalla preview build). Download the desired archive in a prior step and point `jdkFile` at it; setup-java will extract, install, and cache it just like a supported distribution. When targeting multiple architectures, select the correct binary per architecture in your workflow (for example, with a build matrix).
 
 ```yaml
 steps:
@@ -340,7 +340,7 @@ steps:
 - uses: actions/setup-java@v5
   with:
     distribution: 'jdkfile'
-    jdk-file: ${{ runner.temp }}/java_package.tar.gz
+    jdkFile: ${{ runner.temp }}/java_package.tar.gz
     java-version: '11.0.0'
     architecture: x64
     
@@ -357,7 +357,7 @@ steps:
 - uses: actions/setup-java@v5
   with:
     distribution: 'jdkfile'
-    jdk-file: ${{ runner.temp }}/java_package.tar.gz
+    jdkFile: ${{ runner.temp }}/java_package.tar.gz
     java-version: '25.0.0-ea.36'
     architecture: x64
 
@@ -383,7 +383,7 @@ If your use-case requires a custom distribution (in the example, alpine-linux is
       - uses: actions/setup-java@v5
         with:
           distribution: 'jdkfile'
-          jdk-file: ${{ runner.temp }}/java_package.tar.gz
+          jdkFile: ${{ runner.temp }}/java_package.tar.gz
           java-version: {{ steps.fetch_latest_jdk.outputs.java_version }}
           architecture: x64
        - run: java --version
@@ -708,7 +708,7 @@ The result is a Toolchain with entries for JDKs 8, 11 and 15. You can even combi
 - uses: actions/setup-java@v5
   with:
     distribution: 'jdkfile'
-    jdk-file: ${{ runner.temp }}/java_package.tar.gz
+    jdkFile: ${{ runner.temp }}/java_package.tar.gz
     java-version: '1.6'
     architecture: x64
 ```
@@ -725,7 +725,7 @@ Each JDK provider will receive a default `vendor` using the `distribution` input
 - uses: actions/setup-java@v5
   with:
     distribution: 'jdkfile'
-    jdk-file: ${{ runner.temp }}/java_package.tar.gz
+    jdkFile: ${{ runner.temp }}/java_package.tar.gz
     java-version: '1.6'
     architecture: x64
     mvn-toolchain-vendor: 'Oracle'
@@ -780,27 +780,7 @@ steps:
   
   Supported files are `.java-version`, `.tool-versions` and `.sdkmanrc`.
   * In `.java-version` file, only the version should be specified (e.g., 17.0.7). The `.java-version` file recognizes all variants of the version description according to [jenv](https://github.com/jenv/jenv).
-  * In `.tool-versions` file, java version should be preceded by the java keyword (e.g., java 17.0.7). The `.tool-versions` file supports version specifications in accordance with [asdf](https://github.com/asdf-vm/asdf) standards, adhering to Semantic Versioning ([semver](https://semver.org/)). When the entry includes an [asdf-java](https://github.com/halcyon/asdf-java) vendor prefix (e.g. `java temurin-17.0.3+7`), setup-java can infer the `distribution` input automatically. Unrecognized vendor prefixes require setting `distribution` explicitly.
-
-    Supported asdf-java vendor prefix mappings (packaging variants such as `-jre`, `-musl`, `-openj9`, `-crac`, `-javafx` are collapsed onto the base vendor):
-
-    | asdf-java vendor prefix | setup-java distribution |
-    | ----------------------- | ----------------------- |
-    | `temurin` | `temurin` |
-    | `adoptopenjdk` | `temurin` |
-    | `zulu` | `zulu` |
-    | `corretto` | `corretto` |
-    | `liberica` | `liberica` |
-    | `microsoft` | `microsoft` |
-    | `semeru`, `ibm` | `semeru` |
-    | `dragonwell` | `dragonwell` |
-    | `graalvm`, `oracle-graalvm` | `graalvm` |
-    | `graalvm-community` | `graalvm-community` |
-    | `oracle` | `oracle` |
-    | `sapmachine` | `sapmachine` |
-    | `kona` | `kona` |
-    | `jetbrains` | `jetbrains` |
-
+  * In `.tool-versions` file, java version should be preceded by the java keyword (e.g., java 17.0.7). The `.tool-versions` file supports version specifications in accordance with [asdf](https://github.com/asdf-vm/asdf) standards, adhering to Semantic Versioning ([semver](https://semver.org/)).
   * In `.sdkmanrc` file, java version should be preceded by the `java=` prefix (e.g., `java=17.0.7-tem`). When a recognized SDKMAN distribution suffix is present, setup-java can infer the `distribution` input automatically. Unrecognized suffixes require setting `distribution` explicitly. The `.sdkmanrc` file supports version specifications in accordance with [file format](https://sdkman.io/usage#env-command), see [Sdkman! documentation](https://sdkman.io/jdks) for more information.
 
     Supported SDKMAN suffix mappings:
@@ -836,19 +816,6 @@ steps:
 java=17.0.7-tem
 ```
 
-**Example step using `asdf`** (distribution inferred from `.tool-versions`):
-```yml
-  - name: Setup java
-    uses: actions/setup-java@v5
-    with:
-      java-version-file: '.tool-versions'
-```
-
-**Example `.tool-versions`**:
-```
-java temurin-17.0.7+7
-```
-
 Valid entry options (does not apply to `.sdkmanrc`):
 ```
 major versions: 8, 11, 16, 17, 21

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": "5.6.0",
+  "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-check": "prettier --no-error-on-unmatched-pattern --config ./.prettierrc.js --check \"**/*.{ts,yml,yaml}\"",
-    "lint": "eslint --config ./.eslintrc.js \"**/*.ts\"",
-    "lint:fix": "eslint --config ./.eslintrc.js \"**/*.ts\" --fix",
+    "format": "prettier --no-error-on-unmatched-pattern --write \"**/*.{ts,yml,yaml}\"",
+    "format-check": "prettier --no-error-on-unmatched-pattern --check \"**/*.{ts,yml,yaml}\"",
+    "lint": "eslint \"**/*.ts\"",
+    "lint:fix": "eslint \"**/*.ts\" --fix",
     "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",
-      "eslint --config ./.eslintrc.js --fix"
+      "prettier --no-error-on-unmatched-pattern --write",
+      "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/core": "^2.0.3",
-    "@actions/exec": "^2.0.0",
-    "@actions/glob": "^0.5.1",
-    "@actions/http-client": "^3.0.2",
-    "@actions/io": "^2.0.0",
-    "@actions/tool-cache": "^3.0.1",
-    "semver": "^7.6.0",
+    "@actions/cache": "^6.1.0",
+    "@actions/core": "^3.0.1",
+    "@actions/exec": "^3.0.0",
+    "@actions/glob": "^0.7.0",
+    "@actions/http-client": "^4.0.1",
+    "@actions/io": "^3.0.2",
+    "@actions/tool-cache": "^4.0.0",
+    "semver": "^7.8.5",
     "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",
-    "@typescript-eslint/eslint-plugin": "^8.48.0",
+    "@types/semver": "^7.7.0",
+    "@typescript-eslint/eslint-plugin": "^8.62.0",
     "@typescript-eslint/parser": "^8.62.0",
     "@vercel/ncc": "^0.44.0",
-    "eslint": "^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 gpg from './gpg';
-import {getBooleanInput} from './util';
+import * as constants from './constants.js';
+import * as gpg from './gpg.js';
+import {getBooleanInput} from './util.js';
 
 export async function configureAuthentication() {
   const id = core.getInput(constants.INPUT_SERVER_ID);

src/cache.ts

@@ -118,7 +118,6 @@ export async function restore(id: string, cacheDependencyPath: string) {
   const primaryKey = await computeCacheKey(packageManager, cacheDependencyPath);
   core.debug(`primary key is ${primaryKey}`);
   core.saveState(STATE_CACHE_PRIMARY_KEY, primaryKey);
-  core.setOutput(STATE_CACHE_PRIMARY_KEY, primaryKey);
 
   // No "restoreKeys" is set, to start with a clear cache after dependency update (see https://github.com/actions/setup-java/issues/269)
   const matchedKey = await cache.restoreCache(packageManager.path, primaryKey);

src/cleanup-java.ts

@@ -1,8 +1,9 @@
 import * as core from '@actions/core';
-import * as gpg from './gpg';
-import * as constants from './constants';
-import {isJobStatusSuccess} from './util';
-import {save} from './cache';
+import * as gpg from './gpg.js';
+import * as constants from './constants.js';
+import {isJobStatusSuccess} from './util.js';
+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/constants.ts

@@ -4,8 +4,7 @@ export const INPUT_JAVA_VERSION_FILE = 'java-version-file';
 export const INPUT_ARCHITECTURE = 'architecture';
 export const INPUT_JAVA_PACKAGE = 'java-package';
 export const INPUT_DISTRIBUTION = 'distribution';
-export const INPUT_JDK_FILE = 'jdk-file';
-export const INPUT_JDK_FILE_DEPRECATED = 'jdkFile';
+export const INPUT_JDK_FILE = 'jdkFile';
 export const INPUT_CHECK_LATEST = 'check-latest';
 export const INPUT_SET_DEFAULT = 'set-default';
 export const INPUT_VERIFY_SIGNATURE = 'verify-signature';

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 {IAdoptAvailableVersions} from './models';
+import {JavaBase} from '../base-installer.js';
+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';
-import {TemurinDistribution, TemurinImplementation} from '../temurin/installer';
+} from '../../util.js';
+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';
-import {MACOS_JAVA_CONTENT_POSTFIX} from '../constants';
+} from './base-models.js';
+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';
-import {JavaBase} from '../base-installer';
+} from '../../util.js';
+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 {JavaInstallerOptions} from './base-models';
-import {LocalDistribution} from './local/installer';
-import {ZuluDistribution} from './zulu/installer';
-import {AdoptDistribution, AdoptImplementation} from './adopt/installer';
-import {TemurinDistribution, TemurinImplementation} from './temurin/installer';
-import {LibericaDistributions} from './liberica/installer';
-import {MicrosoftDistributions} from './microsoft/installer';
-import {SemeruDistribution} from './semeru/installer';
-import {CorrettoDistribution} from './corretto/installer';
-import {OracleDistribution} from './oracle/installer';
-import {DragonwellDistribution} from './dragonwell/installer';
-import {SapMachineDistribution} from './sapmachine/installer';
+import {JavaBase} from './base-installer.js';
+import {JavaInstallerOptions} from './base-models.js';
+import {LocalDistribution} from './local/installer.js';
+import {ZuluDistribution} from './zulu/installer.js';
+import {AdoptDistribution, AdoptImplementation} from './adopt/installer.js';
+import {
+  TemurinDistribution,
+  TemurinImplementation
+} from './temurin/installer.js';
+import {LibericaDistributions} from './liberica/installer.js';
+import {MicrosoftDistributions} from './microsoft/installer.js';
+import {SemeruDistribution} from './semeru/installer.js';
+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';
-import {JetBrainsDistribution} from './jetbrains/installer';
-import {KonaDistribution} from './kona/installer';
+} from './graalvm/installer.js';
+import {JetBrainsDistribution} from './jetbrains/installer.js';
+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';
-import {IDragonwellVersions, IDragonwellAllVersions} from './models';
+} from '../../util.js';
+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 {IJetBrainsRawVersion, IJetBrainsVersion} from './models';
+import {JavaBase} from '../base-installer.js';
+import {IJetBrainsRawVersion, IJetBrainsVersion} from './models.js';
 import {
   JavaDownloadRelease,
   JavaInstallerOptions,
   JavaInstallerResults
-} from '../base-models';
-import {extractJdkFile, isVersionSatisfies} from '../../util';
+} from '../base-models.js';
+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 {IKonaReleaseInfo, IKonaRelease} from './models';
+import {JavaBase} from '../base-installer.js';
+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';
-import {extractJdkFile} from '../../util';
-import {MACOS_JAVA_CONTENT_POSTFIX} from '../../constants';
+} from '../base-models.js';
+import {extractJdkFile} from '../../util.js';
+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';
-import * as gpg from '../../gpg';
-import {MICROSOFT_PUBLIC_KEY} from './microsoft-key';
+} from '../../util.js';
+import * as gpg from '../../gpg.js';
+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';
-import {JavaBase} from '../base-installer';
+} from '../../util.js';
+import {JavaBase} from '../base-installer.js';
 import {
   JavaDownloadRelease,
   JavaInstallerOptions,
   JavaInstallerResults
-} from '../base-models';
-import {ISapMachineAllVersions, ISapMachineVersions} from './models';
+} from '../base-models.js';
+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 {JavaBase} from '../base-installer';
-import {ITemurinAvailableVersions} from './models';
+import {ADOPTIUM_PUBLIC_KEY} from './adoptium-key.js';
+import {JavaBase} from '../base-installer.js';
+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 {IZuluVersions} from './models';
+import {JavaBase} from '../base-installer.js';
+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 {ExecOptions} from '@actions/exec/lib/interfaces';
+import * as util from './util.js';
+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';
-import * as toolchains from './toolchains';
-import * as constants from './constants';
-import {restore} from './cache';
+} from './util.js';
+import * as toolchains from './toolchains.js';
+import * as constants from './constants.js';
+import {restore} from './cache.js';
 import * as path from 'path';
-import {getJavaDistribution} from './distributions/distribution-factory';
-import {JavaInstallerOptions} from './distributions/base-models';
-import {configureMavenArgs} from './maven-args';
+import {fileURLToPath} from 'url';
+import {getJavaDistribution} from './distributions/distribution-factory.js';
+import {JavaInstallerOptions} from './distributions/base-models.js';
+import {configureMavenArgs} from './maven-args.js';
 
 async function run() {
   try {
@@ -21,7 +22,7 @@ async function run() {
     const versionFile = core.getInput(constants.INPUT_JAVA_VERSION_FILE);
     const architecture = core.getInput(constants.INPUT_ARCHITECTURE);
     const packageType = core.getInput(constants.INPUT_JAVA_PACKAGE);
-    const jdkFile = getJdkFileInput();
+    const jdkFile = core.getInput(constants.INPUT_JDK_FILE);
     const cache = core.getInput(constants.INPUT_CACHE);
     const cacheDependencyPath = core.getInput(
       constants.INPUT_CACHE_DEPENDENCY_PATH
@@ -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();
@@ -128,19 +134,6 @@ async function run() {
 
 run();
 
-function getJdkFileInput(): string {
-  const jdkFile = core.getInput(constants.INPUT_JDK_FILE);
-  const deprecatedJdkFile = core.getInput(constants.INPUT_JDK_FILE_DEPRECATED);
-
-  if (deprecatedJdkFile) {
-    core.warning(
-      `The '${constants.INPUT_JDK_FILE_DEPRECATED}' input is deprecated and may be removed in a future release. Please use '${constants.INPUT_JDK_FILE}' instead.`
-    );
-  }
-
-  return jdkFile || deprecatedJdkFile;
-}
-
 async function installVersion(
   version: string,
   options: installerInputsOptions,

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 {