refactor: update imports to use ES module syntax and improve test structure (#1350)

- Changed import statements across multiple files to use the .js extension for ES module compatibility.
- Refactored test files to utilize jest's unstable_mockModule for mocking core actions.
- Removed unnecessary spy instances in tests, replacing them with direct mocked function calls.
- Updated TypeScript configuration to target ES2022 and use NodeNext module resolution.
- Removed the tsconfig.spec.json file and adjusted the main tsconfig.json to exclude test files.

package.json

@@ -1,20 +1,21 @@
 {
   "name": "stale-action",
-  "version": "10.4.0",
+  "version": "11.0.0",
   "private": true,
+  "type": "module",
   "description": "Marks old issues and PRs as stale",
   "main": "lib/main.js",
   "scripts": {
-    "build": "tsc --project tsconfig.app.json && ncc build",
-    "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",
+    "build": "tsc --project tsconfig.app.json && ncc build lib/main.js",
+    "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",
     "lint:all": "npm run format-check && npm run lint",
     "lint:all:fix": "npm run format && npm run lint:fix",
-    "test": "jest --config ./jest.config.js",
-    "test:only-errors": "jest --reporters jest-silent-reporter --silent",
-    "test:watch": "jest --watch --notify --expand",
+    "test": "node --experimental-vm-modules ./node_modules/jest/bin/jest.js --runInBand",
+    "test:only-errors": "node --experimental-vm-modules ./node_modules/jest/bin/jest.js --reporters jest-silent-reporter --silent",
+    "test:watch": "node --experimental-vm-modules ./node_modules/jest/bin/jest.js --watch --notify --expand",
     "all": "npm run format && npm run lint && npm run build && npm test",
     "all:ci": "npm run format && npm run lint && npm run build && npm run test:only-errors",
     "prerelease": "npm run build",
@@ -37,38 +38,36 @@
   "author": "GitHub",
   "license": "MIT",
   "dependencies": {
-    "@actions/cache": "^5.0.5",
-    "@actions/core": "^2.0.3",
-    "@actions/github": "^7.0.0",
-    "@octokit/core": "^5.2.2",
-    "@octokit/plugin-retry": "^6.1.0",
-    "lodash.deburr": "^4.1.0",
-    "semver": "^7.7.4"
+    "@actions/cache": "^6.1.0",
+    "@actions/core": "^3.0.1",
+    "@actions/github": "^9.1.1",
+    "@octokit/core": "^7.0.6",
+    "@octokit/plugin-retry": "^8.1.0",
+    "lodash.deburr": "^4.1.0"
   },
   "overrides": {
     "undici": "6.27.0"
   },
   "devDependencies": {
-    "@types/jest": "^29.5.14",
+    "@eslint/js": "^10.0.1",
+    "@jest/globals": "^30.4.1",
     "@types/lodash.deburr": "^4.1.6",
-    "@types/node": "^24.3.1",
-    "@types/semver": "^7.5.0",
-    "@typescript-eslint/eslint-plugin": "^7.18.0",
-    "@typescript-eslint/parser": "^7.18.0",
-    "@vercel/ncc": "^0.36.1",
-    "ansi-styles": "5.2.0",
-    "eslint": "^8.56.0",
+    "@types/node": "^24.13.3",
+    "@typescript-eslint/eslint-plugin": "^8.62.1",
+    "@typescript-eslint/parser": "^8.62.1",
+    "@vercel/ncc": "^0.44.1",
+    "ansi-styles": "^6.2.3",
+    "eslint": "^10.7.0",
     "eslint-config-prettier": "^10.1.8",
-    "eslint-plugin-jest": "^27.7.0",
-    "eslint-plugin-node": "^11.1.0",
-    "jest": "^29.6.2",
-    "jest-circus": "^29.5.0",
-    "jest-silent-reporter": "^0.5.0",
-    "js-yaml": "^4.1.1",
-    "prettier": "^2.8.7",
-    "standard-version": "^9.3.1",
-    "terminal-link": "^2.1.1",
-    "ts-jest": "^29.2.5",
-    "typescript": "^5.2.2"
+    "eslint-plugin-jest": "^29.15.4",
+    "eslint-plugin-n": "^18.2.1",
+    "globals": "^17.7.0",
+    "jest": "^30.4.2",
+    "jest-silent-reporter": "^0.6.0",
+    "prettier": "^3.9.4",
+    "standard-version": "^9.5.0",
+    "terminal-link": "^5.0.0",
+    "ts-jest": "^29.4.11",
+    "typescript": "^6.0.3"
   }
 }