Migrate to ESM and upgrade dependencies (#763)

* Migrate to ESM and upgrade dependencies

* Remove unused tsconfig.eslint.json

* bump version to 7.0.0 in package.json and package-lock.json

* Add ESM migration note to README for V7

* Remove unnecessary devDependencies: ts-node, @types/jest

* npm audit fix

* Update README with ESM migration details

Clarified migration details to ESM for action compatibility.

* Downgrade @types/node to ^24, clean up tsconfig and README.

.eslintignore

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

.eslintrc.js

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

.licensed.yml

@@ -10,7 +10,10 @@ allowed:
   - cc0-1.0
   - unlicense
   - 0bsd
+  - blueoak-1.0.0
 
 reviewed:
   npm:
      - "@actions/http-client"
+     - "balanced-match"
+     - "brace-expansion"

.prettierrc.js

@@ -1,11 +0,0 @@
-// This is a reusable configuration file copied from https://github.com/actions/reusable-workflows/tree/main/reusable-configurations. Please don't make changes to this file as it's the subject of an automatic update.
-module.exports = {
-  printWidth: 80,
-  tabWidth: 2,
-  useTabs: false,
-  semi: true,
-  singleQuote: true,
-  trailingComma: 'none',
-  bracketSpacing: false,
-  arrowParens: 'avoid'
-};

.prettierrc.json

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

README.md

@@ -9,6 +9,12 @@ This action sets up a Go environment for use in GitHub Actions by:
 - Optionally caching Go modules and build outputs
 - Registering problem matchers for error output
 
+
+## What's new in V7
+
+The V7 edition of the action includes:
+- Migrated action internals to ESM for compatibility with latest `@actions/*` packages. No changes to action inputs, outputs, or behavior.
+
 ## Breaking changes in V6
 
 The V6 edition of the action includes:

__tests__/cache-restore.test.ts

@@ -1,18 +1,65 @@
-import * as cache from '@actions/cache';
-import * as core from '@actions/core';
-import * as glob from '@actions/glob';
+import {jest, describe, it, expect, beforeEach, afterEach} from '@jest/globals';
 import fs from 'fs';
 
-import * as cacheRestore from '../src/cache-restore';
-import * as cacheUtils from '../src/cache-utils';
-import {PackageManagerInfo} from '../src/package-managers';
+jest.unstable_mockModule('@actions/cache', () => ({
+  saveCache: jest.fn(),
+  restoreCache: jest.fn(),
+  isFeatureAvailable: jest.fn()
+}));
+
+jest.unstable_mockModule('@actions/glob', () => ({
+  create: jest.fn(),
+  hashFiles: jest.fn()
+}));
+
+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)
+}));
+
+// Import real cache-utils (with mocked @actions) before mocking it
+const realCacheUtils = await import('../src/cache-utils.js');
+
+jest.unstable_mockModule('../src/cache-utils.js', () => ({
+  ...realCacheUtils,
+  getCacheDirectoryPath: jest.fn()
+}));
+
+const cache = await import('@actions/cache');
+const core = await import('@actions/core');
+const glob = await import('@actions/glob');
+const cacheRestore = await import('../src/cache-restore.js');
+const cacheUtils = await import('../src/cache-utils.js');
+import type {PackageManagerInfo} from '../src/package-managers.js';
 
 describe('restoreCache', () => {
-  let hashFilesSpy: jest.SpyInstance;
-  let getCacheDirectoryPathSpy: jest.SpyInstance;
-  let restoreCacheSpy: jest.SpyInstance;
-  let infoSpy: jest.SpyInstance;
-  let setOutputSpy: jest.SpyInstance;
+  let hashFilesSpy: jest.Mock<typeof glob.hashFiles>;
+  let getCacheDirectoryPathSpy: jest.Mock<
+    typeof cacheUtils.getCacheDirectoryPath
+  >;
+  let restoreCacheSpy: jest.Mock<typeof cache.restoreCache>;
+  let infoSpy: jest.Mock<typeof core.info>;
+  let setOutputSpy: jest.Mock<typeof core.setOutput>;
 
   const versionSpec = '1.13.1';
   const packageManager = 'default';
@@ -24,11 +71,15 @@ describe('restoreCache', () => {
     originalWorkspace = process.env.GITHUB_WORKSPACE;
     process.env.GITHUB_WORKSPACE = '/test/workspace';
     //Arrange
-    hashFilesSpy = jest.spyOn(glob, 'hashFiles');
-    getCacheDirectoryPathSpy = jest.spyOn(cacheUtils, 'getCacheDirectoryPath');
-    restoreCacheSpy = jest.spyOn(cache, 'restoreCache');
-    infoSpy = jest.spyOn(core, 'info');
-    setOutputSpy = jest.spyOn(core, 'setOutput');
+    hashFilesSpy = glob.hashFiles as jest.Mock<typeof glob.hashFiles>;
+    getCacheDirectoryPathSpy = cacheUtils.getCacheDirectoryPath as jest.Mock<
+      typeof cacheUtils.getCacheDirectoryPath
+    >;
+    restoreCacheSpy = cache.restoreCache as jest.Mock<
+      typeof cache.restoreCache
+    >;
+    infoSpy = core.info as jest.Mock<typeof core.info>;
+    setOutputSpy = core.setOutput as jest.Mock<typeof core.setOutput>;
 
     getCacheDirectoryPathSpy.mockImplementation(
       (PackageManager: PackageManagerInfo) => {

__tests__/cache-save.test.ts

@@ -1,10 +1,41 @@
-import * as cache from '@actions/cache';
-import * as core from '@actions/core';
-import fs from 'fs';
+import {jest, describe, it, expect, beforeEach, afterEach} from '@jest/globals';
 
-import {run} from '../src/cache-save';
-import * as cacheUtils from '../src/cache-utils';
-import {State} from '../src/constants';
+jest.unstable_mockModule('@actions/cache', () => ({
+  saveCache: jest.fn(),
+  restoreCache: jest.fn(),
+  isFeatureAvailable: jest.fn()
+}));
+
+jest.unstable_mockModule('@actions/core', () => ({
+  info: jest.fn(),
+  warning: jest.fn(),
+  debug: jest.fn(),
+  error: jest.fn(),
+  setFailed: jest.fn(),
+  getInput: jest.fn(),
+  getBooleanInput: jest.fn(),
+  getState: jest.fn(),
+  saveState: jest.fn()
+}));
+
+const realFs = (await import('fs')).default;
+const fsExports = {...realFs, existsSync: jest.fn()};
+jest.unstable_mockModule('fs', () => ({...fsExports, default: fsExports}));
+
+// Import real cache-utils (with mocked @actions) before mocking it
+const realCacheUtils = await import('../src/cache-utils.js');
+
+jest.unstable_mockModule('../src/cache-utils.js', () => ({
+  ...realCacheUtils,
+  getCacheDirectoryPath: jest.fn()
+}));
+
+const cache = await import('@actions/cache');
+const core = await import('@actions/core');
+const fs = (await import('fs')).default;
+const cacheUtils = await import('../src/cache-utils.js');
+const {run} = await import('../src/cache-save.js');
+const {State} = await import('../src/constants.js');
 
 describe('cache-save', () => {
   const primaryKey = 'primary-key';
@@ -12,24 +43,28 @@ describe('cache-save', () => {
   let primaryKeyValue: string;
   let matchedKeyValue: string;
 
-  let getBooleanInputSpy: jest.SpyInstance;
-  let getStateSpy: jest.SpyInstance;
-  let infoSpy: jest.SpyInstance;
-  let warningSpy: jest.SpyInstance;
-  let debugSpy: jest.SpyInstance;
-  let setFailedSpy: jest.SpyInstance;
-  let saveCacheSpy: jest.SpyInstance;
-  let getCacheDirectoryPathSpy: jest.SpyInstance;
-  let existsSpy: jest.SpyInstance;
+  let getBooleanInputSpy: jest.Mock<typeof core.getBooleanInput>;
+  let getStateSpy: jest.Mock<typeof core.getState>;
+  let infoSpy: jest.Mock<typeof core.info>;
+  let warningSpy: jest.Mock<typeof core.warning>;
+  let debugSpy: jest.Mock<typeof core.debug>;
+  let setFailedSpy: jest.Mock<typeof core.setFailed>;
+  let saveCacheSpy: jest.Mock<typeof cache.saveCache>;
+  let getCacheDirectoryPathSpy: jest.Mock<
+    typeof cacheUtils.getCacheDirectoryPath
+  >;
+  let existsSpy: jest.Mock<typeof fs.existsSync>;
 
   beforeEach(() => {
     primaryKeyValue = primaryKey;
     matchedKeyValue = 'matched-key';
 
-    getBooleanInputSpy = jest.spyOn(core, 'getBooleanInput');
+    getBooleanInputSpy = core.getBooleanInput as jest.Mock<
+      typeof core.getBooleanInput
+    >;
     getBooleanInputSpy.mockReturnValue(true);
 
-    getStateSpy = jest.spyOn(core, 'getState');
+    getStateSpy = core.getState as jest.Mock<typeof core.getState>;
     getStateSpy.mockImplementation((key: string) => {
       if (key === State.CachePrimaryKey) {
         return primaryKeyValue;
@@ -40,32 +75,34 @@ describe('cache-save', () => {
       return '';
     });
 
-    infoSpy = jest.spyOn(core, 'info');
+    infoSpy = core.info as jest.Mock<typeof core.info>;
     infoSpy.mockImplementation(() => undefined);
 
-    warningSpy = jest.spyOn(core, 'warning');
+    warningSpy = core.warning as jest.Mock<typeof core.warning>;
     warningSpy.mockImplementation(() => undefined);
 
-    debugSpy = jest.spyOn(core, 'debug');
+    debugSpy = core.debug as jest.Mock<typeof core.debug>;
     debugSpy.mockImplementation(() => undefined);
 
-    setFailedSpy = jest.spyOn(core, 'setFailed');
+    setFailedSpy = core.setFailed as jest.Mock<typeof core.setFailed>;
     setFailedSpy.mockImplementation(() => undefined);
 
-    saveCacheSpy = jest.spyOn(cache, 'saveCache');
+    saveCacheSpy = cache.saveCache as jest.Mock<typeof cache.saveCache>;
     saveCacheSpy.mockImplementation(() => Promise.resolve(0));
 
-    getCacheDirectoryPathSpy = jest.spyOn(cacheUtils, 'getCacheDirectoryPath');
+    getCacheDirectoryPathSpy = cacheUtils.getCacheDirectoryPath as jest.Mock<
+      typeof cacheUtils.getCacheDirectoryPath
+    >;
     getCacheDirectoryPathSpy.mockImplementation(() =>
       Promise.resolve(['cache_directory_path', 'cache_directory_path'])
     );
 
-    existsSpy = jest.spyOn(fs, 'existsSync');
+    existsSpy = fs.existsSync as jest.Mock<typeof fs.existsSync>;
     existsSpy.mockImplementation(() => true);
   });
 
   afterEach(() => {
-    jest.restoreAllMocks();
+    jest.clearAllMocks();
   });
 
   it('does not save cache when the cache input is false', async () => {

__tests__/cache-utils.test.ts

@@ -1,22 +1,60 @@
-import * as exec from '@actions/exec';
-import * as cache from '@actions/cache';
-import * as core from '@actions/core';
-import * as cacheUtils from '../src/cache-utils';
-import {PackageManagerInfo} from '../src/package-managers';
+import {jest, describe, it, expect, beforeEach, afterAll} from '@jest/globals';
+
+jest.unstable_mockModule('@actions/exec', () => ({
+  exec: jest.fn(),
+  getExecOutput: jest.fn()
+}));
+
+jest.unstable_mockModule('@actions/cache', () => ({
+  saveCache: jest.fn(),
+  restoreCache: jest.fn(),
+  isFeatureAvailable: jest.fn()
+}));
+
+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 exec = await import('@actions/exec');
+const cache = await import('@actions/cache');
+const core = await import('@actions/core');
+const cacheUtils = await import('../src/cache-utils.js');
+import type {PackageManagerInfo} from '../src/package-managers.js';
 
 describe('getCommandOutput', () => {
   //Arrange
-  const getExecOutputSpy = jest.spyOn(exec, 'getExecOutput');
+  const getExecOutputSpy = exec.getExecOutput as jest.Mock<
+    typeof exec.getExecOutput
+  >;
 
   it('should return trimmed stdout in case of successful exit code', async () => {
     //Arrange
     const stdoutResult = ' stdout ';
     const trimmedStdout = stdoutResult.trim();
 
-    getExecOutputSpy.mockImplementation((commandLine: string) => {
-      return new Promise<exec.ExecOutput>(resolve => {
-        resolve({exitCode: 0, stdout: stdoutResult, stderr: ''});
-      });
+    getExecOutputSpy.mockImplementation(async (commandLine: string) => {
+      return {exitCode: 0, stdout: stdoutResult, stderr: ''};
     });
 
     //Act + Assert
@@ -29,10 +67,8 @@ describe('getCommandOutput', () => {
     //Arrange
     const stderrResult = 'error message';
 
-    getExecOutputSpy.mockImplementation((commandLine: string) => {
-      return new Promise<exec.ExecOutput>(resolve => {
-        resolve({exitCode: 10, stdout: '', stderr: stderrResult});
-      });
+    getExecOutputSpy.mockImplementation(async (commandLine: string) => {
+      return {exitCode: 10, stdout: '', stderr: stderrResult};
     });
 
     //Act + Assert
@@ -70,7 +106,9 @@ describe('getPackageManagerInfo', () => {
 
 describe('getCacheDirectoryPath', () => {
   //Arrange
-  const getExecOutputSpy = jest.spyOn(exec, 'getExecOutput');
+  const getExecOutputSpy = exec.getExecOutput as jest.Mock<
+    typeof exec.getExecOutput
+  >;
 
   const validPackageManager: PackageManagerInfo = {
     dependencyFilePattern: 'go.mod',
@@ -79,10 +117,8 @@ describe('getCacheDirectoryPath', () => {
 
   it('should return path to the cache folders which specified package manager uses', async () => {
     //Arrange
-    getExecOutputSpy.mockImplementation((commandLine: string) => {
-      return new Promise<exec.ExecOutput>(resolve => {
-        resolve({exitCode: 0, stdout: 'path/to/cache/folder', stderr: ''});
-      });
+    getExecOutputSpy.mockImplementation(async (commandLine: string) => {
+      return {exitCode: 0, stdout: 'path/to/cache/folder', stderr: ''};
     });
 
     const expectedResult = ['path/to/cache/folder', 'path/to/cache/folder'];
@@ -95,16 +131,12 @@ describe('getCacheDirectoryPath', () => {
 
   it('should return path to the cache folder if one command return empty str', async () => {
     //Arrange
-    getExecOutputSpy.mockImplementationOnce((commandLine: string) => {
-      return new Promise<exec.ExecOutput>(resolve => {
-        resolve({exitCode: 0, stdout: 'path/to/cache/folder', stderr: ''});
-      });
+    getExecOutputSpy.mockImplementationOnce(async (commandLine: string) => {
+      return {exitCode: 0, stdout: 'path/to/cache/folder', stderr: ''};
     });
 
-    getExecOutputSpy.mockImplementationOnce((commandLine: string) => {
-      return new Promise<exec.ExecOutput>(resolve => {
-        resolve({exitCode: 0, stdout: '', stderr: ''});
-      });
+    getExecOutputSpy.mockImplementationOnce(async (commandLine: string) => {
+      return {exitCode: 0, stdout: '', stderr: ''};
     });
 
     const expectedResult = ['path/to/cache/folder'];
@@ -116,10 +148,8 @@ describe('getCacheDirectoryPath', () => {
   });
 
   it('should throw if the both commands return empty str', async () => {
-    getExecOutputSpy.mockImplementation((commandLine: string) => {
-      return new Promise<exec.ExecOutput>(resolve => {
-        resolve({exitCode: 10, stdout: '', stderr: ''});
-      });
+    getExecOutputSpy.mockImplementation(async (commandLine: string) => {
+      return {exitCode: 10, stdout: '', stderr: ''};
     });
 
     //Act + Assert
@@ -129,10 +159,8 @@ describe('getCacheDirectoryPath', () => {
   });
 
   it('should throw if the specified package name is invalid', async () => {
-    getExecOutputSpy.mockImplementation((commandLine: string) => {
-      return new Promise<exec.ExecOutput>(resolve => {
-        resolve({exitCode: 10, stdout: '', stderr: 'Error message'});
-      });
+    getExecOutputSpy.mockImplementation(async (commandLine: string) => {
+      return {exitCode: 10, stdout: '', stderr: 'Error message'};
     });
 
     //Act + Assert
@@ -144,8 +172,10 @@ describe('getCacheDirectoryPath', () => {
 
 describe('isCacheFeatureAvailable', () => {
   //Arrange
-  const isFeatureAvailableSpy = jest.spyOn(cache, 'isFeatureAvailable');
-  const warningSpy = jest.spyOn(core, 'warning');
+  const isFeatureAvailableSpy = cache.isFeatureAvailable as jest.Mock<
+    typeof cache.isFeatureAvailable
+  >;
+  const warningSpy = core.warning as jest.Mock<typeof core.warning>;
 
   it('should return true when cache feature is available', () => {
     //Arrange
@@ -211,10 +241,9 @@ describe('isCacheFeatureAvailable', () => {
 });
 
 describe('isGhes', () => {
-  const pristineEnv = process.env;
+  const pristineEnv = {...process.env};
 
   beforeEach(() => {
-    jest.resetModules();
     process.env = {...pristineEnv};
   });
 

__tests__/setup-go.test.ts

@@ -1,17 +1,98 @@
-import * as core from '@actions/core';
-import * as io from '@actions/io';
-import * as tc from '@actions/tool-cache';
+import {
+  jest,
+  describe,
+  it,
+  expect,
+  beforeAll,
+  beforeEach,
+  afterEach,
+  afterAll
+} from '@jest/globals';
 import fs from 'fs';
 import cp from 'child_process';
-import osm, {type} from 'os';
-import path from 'path';
-import * as main from '../src/main';
-import * as im from '../src/installer';
-import * as httpm from '@actions/http-client';
 
-import goJsonData from './data/golang-dl.json';
-import matchers from '../matchers.json';
-import goTestManifest from './data/versions-manifest.json';
+import goJsonData from './data/golang-dl.json' with {type: 'json'};
+import matchers from '../matchers.json' with {type: 'json'};
+import goTestManifest from './data/versions-manifest.json' with {type: 'json'};
+
+import type {IGoVersion} from '../src/installer.js';
+import type {IToolRelease} from '@actions/tool-cache';
+
+const httpClientGetJson = jest.fn();
+
+const realCore = await import('@actions/core');
+
+jest.unstable_mockModule('@actions/core', () => ({
+  ...realCore,
+  getInput: jest.fn(),
+  getBooleanInput: jest.fn(),
+  info: jest.fn(),
+  debug: jest.fn(),
+  exportVariable: jest.fn()
+}));
+
+const realOs = (await import('os')).default;
+const osPlatformMock = jest.fn();
+const osArchMock = jest.fn();
+const osExports = {
+  ...realOs,
+  platform: osPlatformMock,
+  arch: osArchMock
+};
+jest.unstable_mockModule('os', () => ({...osExports, default: osExports}));
+
+const realPath = (await import('path')).default;
+const pathJoinMock = jest.fn();
+const pathExports = {
+  ...realPath,
+  join: pathJoinMock
+};
+jest.unstable_mockModule('path', () => ({
+  ...pathExports,
+  default: pathExports
+}));
+
+jest.unstable_mockModule('@actions/io', () => ({
+  which: jest.fn(),
+  mkdirP: jest.fn(),
+  rmRF: jest.fn(),
+  mv: jest.fn(),
+  cp: jest.fn()
+}));
+
+const realTc = await import('@actions/tool-cache');
+
+jest.unstable_mockModule('@actions/tool-cache', () => ({
+  ...realTc,
+  find: jest.fn(),
+  downloadTool: jest.fn(),
+  extractTar: jest.fn(),
+  extractZip: jest.fn(),
+  cacheDir: jest.fn(),
+  getManifestFromRepo: jest.fn()
+}));
+
+const realHttp = await import('@actions/http-client');
+
+jest.unstable_mockModule('@actions/http-client', () => ({
+  ...realHttp,
+  HttpClient: jest.fn().mockImplementation(() => ({
+    getJson: httpClientGetJson
+  }))
+}));
+
+jest.unstable_mockModule('../src/go-version-fetch.js', () => ({
+  getVersionsDist: jest.fn()
+}));
+
+const core = await import('@actions/core');
+const io = await import('@actions/io');
+const tc = await import('@actions/tool-cache');
+const vf = await import('../src/go-version-fetch.js');
+const main = await import('../src/main.js');
+const im = await import('../src/installer.js');
+const osm = (await import('os')).default;
+const path = (await import('path')).default;
 const matcherPattern = matchers.problemMatcher[0].pattern[0];
 const matcherRegExp = new RegExp(matcherPattern.regexp);
 const win32Join = path.win32.join;
@@ -23,32 +104,31 @@ describe('setup-go', () => {
   let inputs = {} as any;
   let os = {} as any;
 
-  let inSpy: jest.SpyInstance;
-  let getBooleanInputSpy: jest.SpyInstance;
-  let exportVarSpy: jest.SpyInstance;
-  let findSpy: jest.SpyInstance;
-  let cnSpy: jest.SpyInstance;
-  let logSpy: jest.SpyInstance;
-  let getSpy: jest.SpyInstance;
-  let platSpy: jest.SpyInstance;
-  let archSpy: jest.SpyInstance;
-  let joinSpy: jest.SpyInstance;
-  let dlSpy: jest.SpyInstance;
-  let extractTarSpy: jest.SpyInstance;
-  let extractZipSpy: jest.SpyInstance;
-  let cacheSpy: jest.SpyInstance;
-  let dbgSpy: jest.SpyInstance;
-  let whichSpy: jest.SpyInstance;
-  let existsSpy: jest.SpyInstance;
-  let readFileSpy: jest.SpyInstance;
-  let mkdirpSpy: jest.SpyInstance;
-  let mkdirSpy: jest.SpyInstance;
-  let symlinkSpy: jest.SpyInstance;
-  let execSpy: jest.SpyInstance;
-  let execFileSpy: jest.SpyInstance;
-  let getManifestSpy: jest.SpyInstance;
-  let getAllVersionsSpy: jest.SpyInstance;
-  let httpmGetJsonSpy: jest.SpyInstance;
+  let inSpy: jest.Mock<typeof core.getInput>;
+  let getBooleanInputSpy: jest.Mock<typeof core.getBooleanInput>;
+  let exportVarSpy: jest.Mock<typeof core.exportVariable>;
+  let findSpy: jest.Mock;
+  let cnSpy: jest.SpiedFunction<typeof process.stdout.write>;
+  let logSpy: jest.Mock;
+  let getSpy: jest.Mock;
+  let platSpy: jest.Mock;
+  let archSpy: jest.Mock;
+  let joinSpy: jest.Mock<typeof path.join>;
+  let dlSpy: jest.Mock;
+  let extractTarSpy: jest.Mock;
+  let extractZipSpy: jest.Mock;
+  let cacheSpy: jest.Mock;
+  let dbgSpy: jest.Mock;
+  let whichSpy: jest.Mock;
+  let existsSpy: jest.SpiedFunction<typeof fs.existsSync>;
+  let readFileSpy: jest.SpiedFunction<typeof fs.readFileSync>;
+  let mkdirpSpy: jest.Mock;
+  let mkdirSpy: jest.SpiedFunction<typeof fs.mkdir>;
+  let symlinkSpy: jest.SpiedFunction<typeof fs.symlinkSync>;
+  let execSpy: jest.SpiedFunction<typeof cp.execSync>;
+  let execFileSpy: jest.SpiedFunction<typeof cp.execFileSync>;
+  let getManifestSpy: jest.Mock;
+  let httpmGetJsonSpy: jest.Mock;
 
   beforeAll(async () => {
     process.env['GITHUB_ENV'] = ''; // Stub out Environment file functionality so we can verify it writes to standard out (toolkit is backwards compatible)
@@ -59,17 +139,19 @@ describe('setup-go', () => {
 
     // @actions/core
     inputs = {};
-    inSpy = jest.spyOn(core, 'getInput');
+    inSpy = core.getInput as jest.Mock<typeof core.getInput>;
     inSpy.mockImplementation(name => inputs[name]);
-    getBooleanInputSpy = jest.spyOn(core, 'getBooleanInput');
+    getBooleanInputSpy = core.getBooleanInput as jest.Mock<
+      typeof core.getBooleanInput
+    >;
     getBooleanInputSpy.mockImplementation(name => inputs[name]);
-    exportVarSpy = jest.spyOn(core, 'exportVariable');
+    exportVarSpy = core.exportVariable as jest.Mock<typeof core.exportVariable>;
 
     // node
     os = {};
-    platSpy = jest.spyOn(osm, 'platform');
+    platSpy = osm.platform as jest.Mock;
     platSpy.mockImplementation(() => os['platform']);
-    archSpy = jest.spyOn(osm, 'arch');
+    archSpy = osm.arch as jest.Mock;
     archSpy.mockImplementation(() => os['arch']);
     execSpy = jest.spyOn(cp, 'execSync');
     execFileSpy = jest.spyOn(cp, 'execFileSync');
@@ -78,7 +160,7 @@ describe('setup-go', () => {
     });
 
     // switch path join behaviour based on set os.platform
-    joinSpy = jest.spyOn(path, 'join');
+    joinSpy = path.join as jest.Mock<typeof path.join>;
     joinSpy.mockImplementation((...paths: string[]): string => {
       if (os['platform'] == 'win32') {
         return win32Join(...paths);
@@ -88,23 +170,22 @@ describe('setup-go', () => {
     });
 
     // @actions/tool-cache
-    findSpy = jest.spyOn(tc, 'find');
-    dlSpy = jest.spyOn(tc, 'downloadTool');
-    extractTarSpy = jest.spyOn(tc, 'extractTar');
-    extractZipSpy = jest.spyOn(tc, 'extractZip');
-    cacheSpy = jest.spyOn(tc, 'cacheDir');
-    getSpy = jest.spyOn(im, 'getVersionsDist');
-    getManifestSpy = jest.spyOn(tc, 'getManifestFromRepo');
-    getAllVersionsSpy = jest.spyOn(im, 'getManifest');
+    findSpy = tc.find as jest.Mock;
+    dlSpy = tc.downloadTool as jest.Mock;
+    extractTarSpy = tc.extractTar as jest.Mock;
+    extractZipSpy = tc.extractZip as jest.Mock;
+    cacheSpy = tc.cacheDir as jest.Mock;
+    getSpy = vf.getVersionsDist as jest.Mock;
+    getManifestSpy = tc.getManifestFromRepo as jest.Mock;
 
     // httm
-    httpmGetJsonSpy = jest.spyOn(httpm.HttpClient.prototype, 'getJson');
+    httpmGetJsonSpy = httpClientGetJson;
 
     // io
-    whichSpy = jest.spyOn(io, 'which');
+    whichSpy = io.which as jest.Mock;
     existsSpy = jest.spyOn(fs, 'existsSync');
     readFileSpy = jest.spyOn(fs, 'readFileSync');
-    mkdirpSpy = jest.spyOn(io, 'mkdirP');
+    mkdirpSpy = io.mkdirP as jest.Mock;
 
     // fs
     mkdirSpy = jest.spyOn(fs, 'mkdir');
@@ -112,25 +193,16 @@ describe('setup-go', () => {
     symlinkSpy.mockImplementation(() => {});
 
     // gets
-    getManifestSpy.mockImplementation(() => <tc.IToolRelease[]>goTestManifest);
+    getManifestSpy.mockImplementation(() => goTestManifest as IToolRelease[]);
 
     // writes
     cnSpy = jest.spyOn(process.stdout, 'write');
-    logSpy = jest.spyOn(core, 'info');
-    dbgSpy = jest.spyOn(core, 'debug');
-    getSpy.mockImplementation(() => <im.IGoVersion[] | null>goJsonData);
-    cnSpy.mockImplementation(line => {
-      // uncomment to debug
-      // process.stderr.write('write:' + line + '\n');
-    });
-    logSpy.mockImplementation(line => {
-      // uncomment to debug
-      //process.stderr.write('log:' + line + '\n');
-    });
-    dbgSpy.mockImplementation(msg => {
-      // uncomment to see debug output
-      // process.stderr.write(msg + '\n');
-    });
+    logSpy = core.info as jest.Mock;
+    dbgSpy = core.debug as jest.Mock;
+    getSpy.mockImplementation(() => goJsonData as IGoVersion[] | null);
+    cnSpy.mockImplementation(() => true);
+    logSpy.mockImplementation(() => {});
+    dbgSpy.mockImplementation(() => {});
   });
 
   afterEach(() => {
@@ -138,6 +210,10 @@ describe('setup-go', () => {
     delete process.env[im.GOTOOLCHAIN_ENV_VAR];
     delete process.env['GO_DOWNLOAD_BASE_URL'];
 
+    // reset the exit code that core.setFailed sets on the error-path tests so
+    // that a passing run does not leak a non-zero process exit code
+    process.exitCode = 0;
+
     //jest.resetAllMocks();
     jest.clearAllMocks();
     //jest.restoreAllMocks();
@@ -171,8 +247,10 @@ describe('setup-go', () => {
   });
 
   it('should return manifest from raw URL if repo fetch fails', async () => {
-    getManifestSpy.mockRejectedValue(new Error('Fetch failed'));
-    httpmGetJsonSpy.mockResolvedValue({
+    (getManifestSpy as jest.Mock<any>).mockRejectedValue(
+      new Error('Fetch failed')
+    );
+    (httpmGetJsonSpy as jest.Mock<any>).mockResolvedValue({
       result: goTestManifest
     });
     const manifest = await im.getManifest(undefined);
@@ -211,7 +289,7 @@ describe('setup-go', () => {
     os.arch = 'x64';
 
     // spec: 1.13.0 => 1.13
-    const match: im.IGoVersion | undefined = await im.findMatch('1.13.0');
+    const match: IGoVersion | undefined = await im.findMatch('1.13.0');
     expect(match).toBeDefined();
     const version: string = match ? match.version : '';
     expect(version).toBe('go1.13');
@@ -224,7 +302,7 @@ describe('setup-go', () => {
     os.arch = 'x64';
 
     // spec: 1.13 => 1.13.7 (latest)
-    const match: im.IGoVersion | undefined = await im.findMatch('1.13');
+    const match: IGoVersion | undefined = await im.findMatch('1.13');
     expect(match).toBeDefined();
     const version: string = match ? match.version : '';
     expect(version).toBe('go1.13.7');
@@ -237,7 +315,7 @@ describe('setup-go', () => {
     os.arch = 'x64';
 
     // spec: ^1.13.6 => 1.13.7
-    const match: im.IGoVersion | undefined = await im.findMatch('^1.13.6');
+    const match: IGoVersion | undefined = await im.findMatch('^1.13.6');
     expect(match).toBeDefined();
     const version: string = match ? match.version : '';
     expect(version).toBe('go1.13.7');
@@ -250,7 +328,7 @@ describe('setup-go', () => {
     os.arch = 'x32';
 
     // spec: 1 => 1.13.7 (latest)
-    const match: im.IGoVersion | undefined = await im.findMatch('1');
+    const match: IGoVersion | undefined = await im.findMatch('1');
     expect(match).toBeDefined();
     const version: string = match ? match.version : '';
     expect(version).toBe('go1.13.7');
@@ -263,7 +341,7 @@ describe('setup-go', () => {
     os.arch = 'x64';
 
     // spec: 1.14, stable=false => go1.14rc1
-    const match: im.IGoVersion | undefined = await im.findMatch('1.14.0-rc.1');
+    const match: IGoVersion | undefined = await im.findMatch('1.14.0-rc.1');
     expect(match).toBeDefined();
     const version: string = match ? match.version : '';
     expect(version).toBe('go1.14rc1');
@@ -817,10 +895,9 @@ describe('setup-go', () => {
       getManifestSpy.mockImplementation(() => {
         throw new Error('Unable to download manifest');
       });
-      httpmGetJsonSpy.mockRejectedValue(
+      (httpmGetJsonSpy as jest.Mock<any>).mockRejectedValue(
         new Error('Unable to download manifest from raw URL')
       );
-      getAllVersionsSpy.mockImplementationOnce(() => undefined);
 
       dlSpy.mockImplementation(async () => '/some/temp/path');
       const toolPath = path.normalize('/cache/go/1.13.7/x64');

__tests__/utils.test.ts

@@ -1,4 +1,5 @@
-import {isSelfHosted} from '../src/utils';
+import {describe, it, expect, beforeEach, afterEach} from '@jest/globals';
+import {isSelfHosted} from '../src/utils.js';
 
 describe('utils', () => {
   describe('isSelfHosted', () => {

__tests__/windows-toolcache.test.ts

@@ -1,38 +1,57 @@
-import fs from 'fs';
-import * as io from '@actions/io';
-import * as tc from '@actions/tool-cache';
+import {jest, describe, it, expect, beforeEach, afterEach} from '@jest/globals';
 import path from 'path';
 
+const statSyncMock = jest.fn(() => ({
+  isDirectory: () => true,
+  isFile: () => true
+}));
+const readdirSyncMock = jest.fn(() => [] as any);
+const writeFileSyncMock = jest.fn();
+const mkdirMock = jest.fn();
+const symlinkSyncMock = jest.fn();
+
+jest.unstable_mockModule('@actions/io', () => ({
+  which: jest.fn(),
+  mkdirP: jest.fn(() => Promise.resolve()),
+  rmRF: jest.fn(() => Promise.resolve()),
+  mv: jest.fn(() => Promise.resolve()),
+  cp: jest.fn(() => Promise.resolve())
+}));
+
+const realFs = (await import('fs')).default;
+const fsExports = {
+  ...realFs,
+  statSync: statSyncMock,
+  readdirSync: readdirSyncMock,
+  writeFileSync: writeFileSyncMock,
+  mkdir: mkdirMock,
+  symlinkSync: symlinkSyncMock
+};
+jest.unstable_mockModule('fs', () => ({...fsExports, default: fsExports}));
+
+const io = await import('@actions/io');
+const tc = await import('@actions/tool-cache');
+
 describe('Windows performance workaround', () => {
-  let mkdirSpy: jest.SpyInstance;
-  let symlinkSpy: jest.SpyInstance;
-  let statSpy: jest.SpyInstance;
-  let readdirSpy: jest.SpyInstance;
-  let writeFileSpy: jest.SpyInstance;
-  let rmRFSpy: jest.SpyInstance;
-  let mkdirPSpy: jest.SpyInstance;
-  let cpSpy: jest.SpyInstance;
+  let rmRFSpy: jest.Mock;
+  let mkdirPSpy: jest.Mock;
+  let cpSpy: jest.Mock;
 
   let runnerToolCache: string | undefined;
   beforeEach(() => {
-    mkdirSpy = jest.spyOn(fs, 'mkdir');
-    symlinkSpy = jest.spyOn(fs, 'symlinkSync');
-    statSpy = jest.spyOn(fs, 'statSync');
-    readdirSpy = jest.spyOn(fs, 'readdirSync');
-    writeFileSpy = jest.spyOn(fs, 'writeFileSync');
-    rmRFSpy = jest.spyOn(io, 'rmRF');
-    mkdirPSpy = jest.spyOn(io, 'mkdirP');
-    cpSpy = jest.spyOn(io, 'cp');
+    rmRFSpy = io.rmRF as jest.Mock;
+    mkdirPSpy = io.mkdirP as jest.Mock;
+    cpSpy = io.cp as jest.Mock;
 
     // default implementations
-    // @ts-ignore - not implement unused methods
-    statSpy.mockImplementation(() => ({
-      isDirectory: () => true
+    statSyncMock.mockImplementation(() => ({
+      isDirectory: () => true,
+      isFile: () => true
     }));
-    readdirSpy.mockImplementation(() => []);
-    writeFileSpy.mockImplementation(() => {});
-    mkdirSpy.mockImplementation(() => {});
-    symlinkSpy.mockImplementation(() => {});
+    readdirSyncMock.mockImplementation(() => []);
+    writeFileSyncMock.mockImplementation(() => {});
+    mkdirMock.mockImplementation(() => {});
+    symlinkSyncMock.mockImplementation(() => {});
     rmRFSpy.mockImplementation(() => Promise.resolve());
     mkdirPSpy.mockImplementation(() => Promise.resolve());
     cpSpy.mockImplementation(() => Promise.resolve());

dist/cache-save/package.json

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

dist/setup/package.json

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

eslint.config.mjs

@@ -0,0 +1,74 @@
+// 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-go",
-  "version": "6.5.0",
+  "version": "7.0.0",
+  "type": "module",
   "private": true,
   "description": "setup go action",
   "main": "lib/setup-go.js",
@@ -9,11 +10,11 @@
   },
   "scripts": {
     "build": "tsc && ncc build -o dist/setup src/setup-go.ts && ncc build -o dist/cache-save src/cache-save.ts",
-    "format": "prettier --no-error-on-unmatched-pattern --config ./.prettierrc.js --write \"**/*.{ts,yml,yaml}\"",
-    "format-check": "prettier --no-error-on-unmatched-pattern --config ./.prettierrc.js --check \"**/*.{ts,yml,yaml}\"",
-    "lint": "eslint --config ./.eslintrc.js \"**/*.ts\"",
-    "lint:fix": "eslint --config ./.eslintrc.js \"**/*.ts\" --fix",
-    "test": "jest --coverage",
+    "format": "prettier --no-error-on-unmatched-pattern --write \"**/*.{ts,yml,yaml}\"",
+    "format-check": "prettier --no-error-on-unmatched-pattern --check \"**/*.{ts,yml,yaml}\"",
+    "lint": "eslint \"**/*.ts\"",
+    "lint:fix": "eslint \"**/*.ts\" --fix",
+    "test": "node --experimental-vm-modules ./node_modules/jest/bin/jest.js --runInBand --coverage",
     "pre-checkin": "npm run format && npm run lint:fix && npm run build && npm test"
   },
   "repository": {
@@ -28,31 +29,32 @@
   "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": "^7.7.3"
+    "@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"
   },
   "devDependencies": {
-    "@types/jest": "^29.5.14",
-    "@types/node": "^25.9.3",
-    "@types/semver": "^7.7.1",
-    "@typescript-eslint/eslint-plugin": "^8.61.0",
-    "@typescript-eslint/parser": "^8.61.0",
-    "@vercel/ncc": "^0.38.1",
-    "eslint": "^8.57.0",
-    "eslint-config-prettier": "^10.1.8",
-    "eslint-plugin-jest": "^29.0.1",
-    "eslint-plugin-node": "^11.1.0",
-    "jest": "^29.7.0",
-    "jest-circus": "^29.7.0",
-    "nock": "^10.0.6",
-    "prettier": "^2.8.4",
-    "ts-jest": "^29.3.2",
-    "typescript": "^5.8.3"
+    "@eslint/js": "^10.0.1",
+    "@jest/globals": "^30.4.1",
+    "@types/node": "^24.0.0",
+    "@types/semver": "^7.7.0",
+    "@typescript-eslint/eslint-plugin": "^8.62.0",
+    "@typescript-eslint/parser": "^8.62.0",
+    "@vercel/ncc": "^0.44.0",
+    "eslint": "^10.5.0",
+    "eslint-config-prettier": "^10.0.0",
+    "eslint-plugin-jest": "^29.15.2",
+    "eslint-plugin-n": "^18.1.0",
+    "globals": "^17.7.0",
+    "jest": "^30.4.2",
+    "nock": "^14.0.0",
+    "prettier": "^3.8.4",
+    "ts-jest": "^29.4.11",
+    "typescript": "^6.0.3"
   }
 }

src/cache-restore.ts

@@ -4,9 +4,9 @@ import * as glob from '@actions/glob';
 import path from 'path';
 import fs from 'fs';
 
-import {State, Outputs} from './constants';
-import {PackageManagerInfo} from './package-managers';
-import {getCacheDirectoryPath, getPackageManagerInfo} from './cache-utils';
+import {State, Outputs} from './constants.js';
+import {PackageManagerInfo} from './package-managers.js';
+import {getCacheDirectoryPath, getPackageManagerInfo} from './cache-utils.js';
 
 export const restoreCache = async (
   versionSpec: string,

src/cache-save.ts

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

src/cache-utils.ts

@@ -1,7 +1,10 @@
 import * as cache from '@actions/cache';
 import * as core from '@actions/core';
 import * as exec from '@actions/exec';
-import {supportedPackageManagers, PackageManagerInfo} from './package-managers';
+import {
+  supportedPackageManagers,
+  PackageManagerInfo
+} from './package-managers.js';
 
 export const getCommandOutput = async (toolCommand: string) => {
   let {stdout, stderr, exitCode} = await exec.getExecOutput(

src/go-version-fetch.ts

@@ -0,0 +1,13 @@
+import * as httpm from '@actions/http-client';
+import type {IGoVersion} from './installer.js';
+
+export async function getVersionsDist(
+  dlUrl: string
+): Promise<IGoVersion[] | null> {
+  // this returns versions descending so latest is first
+  const http: httpm.HttpClient = new httpm.HttpClient('setup-go', [], {
+    allowRedirects: true,
+    maxRedirects: 3
+  });
+  return (await http.getJson<IGoVersion[]>(dlUrl)).result;
+}

src/installer.ts

@@ -3,13 +3,14 @@ import * as core from '@actions/core';
 import * as path from 'path';
 import * as semver from 'semver';
 import * as httpm from '@actions/http-client';
-import * as sys from './system';
+import * as sys from './system.js';
 import crypto from 'crypto';
 import cp from 'child_process';
 import fs from 'fs';
 import os from 'os';
-import {StableReleaseAlias, isSelfHosted} from './utils';
-import {Architecture} from './types';
+import {StableReleaseAlias, isSelfHosted} from './utils.js';
+import {Architecture} from './types.js';
+import {getVersionsDist} from './go-version-fetch.js';
 
 export const GOTOOLCHAIN_ENV_VAR = 'GOTOOLCHAIN';
 export const GOTOOLCHAIN_LOCAL_VAL = 'local';
@@ -167,12 +168,14 @@ export async function getGo(
       if (err instanceof tc.HTTPError && err.httpStatusCode === 404) {
         throw new Error(
           `The requested Go version ${versionSpec} is not available for platform ${osPlat}/${arch}. ` +
-            `Download URL returned HTTP 404: ${downloadUrl}`
+            `Download URL returned HTTP 404: ${downloadUrl}`,
+          {cause: err}
         );
       }
       throw new Error(
         `Failed to download Go ${versionSpec} for platform ${osPlat}/${arch} ` +
-          `from ${downloadUrl}: ${err}`
+          `from ${downloadUrl}: ${err}`,
+        {cause: err}
       );
     }
   } else {
@@ -218,7 +221,9 @@ export async function getGo(
         core.info('Install from dist');
         downloadPath = await installGoVersion(info, undefined, arch);
       } catch (err) {
-        throw new Error(`Failed to download version ${versionSpec}: ${err}`);
+        throw new Error(`Failed to download version ${versionSpec}: ${err}`, {
+          cause: err
+        });
       }
     }
   }
@@ -569,9 +574,7 @@ export async function findMatch(
   let result: IGoVersion | undefined;
   let match: IGoVersion | undefined;
 
-  const candidates: IGoVersion[] | null = await module.exports.getVersionsDist(
-    dlUrl
-  );
+  const candidates: IGoVersion[] | null = await getVersionsDist(dlUrl);
   if (!candidates) {
     throw new Error(`golang download url did not return results`);
   }
@@ -607,17 +610,6 @@ export async function findMatch(
   return result;
 }
 
-export async function getVersionsDist(
-  dlUrl: string
-): Promise<IGoVersion[] | null> {
-  // this returns versions descending so latest is first
-  const http: httpm.HttpClient = new httpm.HttpClient('setup-go', [], {
-    allowRedirects: true,
-    maxRedirects: 3
-  });
-  return (await http.getJson<IGoVersion[]>(dlUrl)).result;
-}
-
 //
 // Convert the go version syntax into semver for semver matching
 // 1.13.1 => 1.13.1
@@ -686,9 +678,8 @@ async function resolveStableVersionDist(
 ) {
   const archFilter = sys.getArch(arch);
   const platFilter = sys.getPlatform();
-  const candidates: IGoVersion[] | null = await module.exports.getVersionsDist(
-    GOLANG_DOWNLOAD_URL
-  );
+  const candidates: IGoVersion[] | null =
+    await getVersionsDist(GOLANG_DOWNLOAD_URL);
   if (!candidates) {
     throw new Error(`golang download url did not return results`);
   }

src/main.ts

@@ -1,14 +1,15 @@
 import * as core from '@actions/core';
 import * as io from '@actions/io';
-import * as installer from './installer';
+import * as installer from './installer.js';
 import * as semver from 'semver';
 import path from 'path';
-import {restoreCache} from './cache-restore';
-import {isCacheFeatureAvailable} from './cache-utils';
+import {fileURLToPath} from 'url';
+import {restoreCache} from './cache-restore.js';
+import {isCacheFeatureAvailable} from './cache-utils.js';
 import cp from 'child_process';
 import fs from 'fs';
 import os from 'os';
-import {Architecture} from './types';
+import {Architecture} from './types.js';
 
 export async function run() {
   try {
@@ -91,7 +92,11 @@ export async function run() {
     }
 
     // add problem matchers
-    const matchersPath = path.join(__dirname, '../..', 'matchers.json');
+    const matchersPath = path.join(
+      path.dirname(fileURLToPath(import.meta.url)),
+      '../..',
+      'matchers.json'
+    );
     core.info(`##[add-matcher]${matchersPath}`);
 
     // output the version actually being used

src/setup-go.ts

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

src/system.ts

@@ -1,5 +1,5 @@
 import os from 'os';
-import {Architecture} from './types';
+import {Architecture} from './types.js';
 
 export function getPlatform(): string {
   // darwin and linux match already

tsconfig.json

@@ -2,8 +2,8 @@
   "compilerOptions": {
     /* Basic Options */
     // "incremental": true,                   /* Enable incremental compilation */
-    "target": "es6",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'. */
-    "module": "commonjs",                     /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
+    "target": "ES2022",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'. */
+    "module": "NodeNext",                     /* Specify module code generation. */
     // "allowJs": true,                       /* Allow javascript files to be compiled. */
     // "checkJs": true,                       /* Report errors in .js files. */
     // "jsx": "preserve",                     /* Specify JSX code generation: 'preserve', 'react-native', or 'react'. */
@@ -38,7 +38,7 @@
     // "noFallthroughCasesInSwitch": true,    /* Report errors for fallthrough cases in switch statement. */
 
     /* Module Resolution Options */
-    // "moduleResolution": "node",            /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */
+    // "moduleResolution": "NodeNext",            /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */
     // "baseUrl": "./",                       /* Base directory to resolve non-absolute module names. */
     // "paths": {},                           /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */
     // "rootDirs": [],                        /* List of root folders whose combined content represents the structure of the project at runtime. */
@@ -61,5 +61,5 @@
     // "experimentalDecorators": true,        /* Enables experimental support for ES7 decorators. */
     // "emitDecoratorMetadata": true,         /* Enables experimental support for emitting type metadata for decorators. */
   },
-  "exclude": ["node_modules", "**/*.test.ts"]
+  "exclude": ["node_modules", "**/*.test.ts", "jest.config.ts"]
 }