feat: update build process for ESM-only @actions/core v3

- Add "type": "module" to package.json for ESM support
- Update TypeScript config to output ES2022 modules with esModuleInterop
- Convert Jest config to ESM (.mjs) with proper ts-jest ESM preset
- Rename .prettierrc.js to .prettierrc.cjs for CommonJS compatibility
- Replace actions-toolkit with @actions/github for ESM compatibility
- Configure Jest to handle ESM modules from @actions packages
- Update test script to use NODE_OPTIONS for experimental VM modules
- Build now outputs ESM format successfully

Co-authored-by: EndBug <26386270+EndBug@users.noreply.github.com>

Author: Copilot

.prettierrc.js .prettierrc.cjs.prettierrc.js renamed to .prettierrc.cjs

@@ -0,0 +1,22 @@
+/** @type {import('ts-jest').JestConfigWithTsJest} */
+export default {
+  preset: 'ts-jest/presets/default-esm',
+  testEnvironment: 'node',
+  extensionsToTreatAsEsm: ['.ts'],
+  moduleNameMapper: {
+    '^(\\.{1,2}/.*)\\.js$': '$1',
+    '^@actions/core$': '<rootDir>/node_modules/@actions/core/lib/core.js',
+    '^@actions/github$': '<rootDir>/node_modules/@actions/github/lib/github.js',
+  },
+  transform: {
+    '^.+\\.tsx?$': [
+      'ts-jest',
+      {
+        useESM: true,
+      },
+    ],
+  },
+  transformIgnorePatterns: [
+    'node_modules/(?!(@actions/core|@actions/github|@actions/http-client)/)',
+  ],
+};

jest.config.js

@@ -2,20 +2,21 @@
   "name": "add-and-commit",
   "version": "9.1.4",
   "private": true,
+  "type": "module",
   "description": "Add & commit files from a path directly from GitHub Actions",
   "main": "lib/index.js",
   "scripts": {
     "prebuild": "npm run clean",
     "build": "ncc build src/main.ts --minify --out lib",
     "lint": "gts lint",
     "prepare": "husky",
-    "test": "jest && npm run lint",
+    "test": "NODE_OPTIONS='--experimental-vm-modules' jest && npm run lint",
     "clean": "gts clean",
     "fix": "gts fix"
   },
   "dependencies": {
     "@actions/core": "^3.0.0",
-    "actions-toolkit": "github:EndBug/actions-toolkit#core-actions",
+    "@actions/github": "^9.0.0",
     "js-yaml": "^4.1.1",
     "simple-git": "^3.18.0",
     "string-argv": "^0.3.2"

jest.config.mjs

@@ -1,31 +1,22 @@
 import {parseArgsStringToArgv} from 'string-argv';
 import * as core from '@actions/core';
 import * as YAML from 'js-yaml';
-import {Toolkit} from 'actions-toolkit';
+import {getOctokit} from '@actions/github';
 import * as fs from 'fs';
-import {input, output} from './io';
 
-type RecordOf<T extends string> = Record<T, string | undefined>;
-let tools: Toolkit<RecordOf<input>, RecordOf<output>> | undefined;
-function getToolkit() {
-  if (!tools) {
-    tools = new Toolkit<RecordOf<input>, RecordOf<output>>({
-      secrets: [
-        'GITHUB_EVENT_PATH',
-        'GITHUB_EVENT_NAME',
-        'GITHUB_REF',
-        'GITHUB_ACTOR',
-      ],
-    });
+function getOctokitClient() {
+  const token = process.env.INPUT_GITHUB_TOKEN;
+  if (!token) {
+    throw new Error('GITHUB_TOKEN is required');
   }
-
-  return tools;
+  return getOctokit(token);
 }
 
 export async function getUserInfo(username?: string) {
   if (!username) return undefined;
 
-  const res = await getToolkit().github.users.getByUsername({username});
+  const octokit = getOctokitClient();
+  const res = await octokit.rest.users.getByUsername({username});
 
   core.debug(
     `Fetched github actor from the API: ${JSON.stringify(res?.data, null, 2)}`,

lib/index.js

@@ -4,7 +4,10 @@
     "rootDir": ".",
     "outDir": "./lib",
     "composite": false,
-    "declaration": false
+    "declaration": false,
+    "module": "ES2022",
+    "moduleResolution": "node",
+    "esModuleInterop": true
   },
   "include": [
     "src/**/*.ts",