Update ESLint and TypeScript dependencies to latest major versions

Co-authored-by: TylerDixon <4308048+TylerDixon@users.noreply.github.com>

.eslintignore

@@ -1,5 +0,0 @@
-dist/
-lib/
-node_modules/
-jest.config.js
-fix-regex.js

.eslintrc.json

@@ -1,26 +0,0 @@
-{
-  "root": true,
-  "parser": "@typescript-eslint/parser",
-  "plugins": ["@typescript-eslint", "github", "jest", "prettier"],
-  "extends": [
-    "plugin:github/recommended",
-    "plugin:@typescript-eslint/eslint-recommended",
-    "plugin:@typescript-eslint/recommended",
-    "prettier"
-  ],
-  "parserOptions": {
-    "ecmaVersion": 2019,
-    "sourceType": "module"
-  },
-  "env": {
-    "node": true,
-    "es6": true,
-    "jest/globals": true
-  },
-  "rules": {
-    "filenames/match-regex": "off",
-    "github/no-then": "off",
-    "i18n-text/no-en": "off",
-    "import/no-namespace": "off"
-  }
-}

eslint.config.mjs

@@ -0,0 +1,78 @@
+import eslint from '@eslint/js'
+import tseslint from 'typescript-eslint'
+import github from 'eslint-plugin-github'
+import jest from 'eslint-plugin-jest'
+import globals from 'globals'
+
+export default [
+  // Ignore patterns
+  {
+    ignores: ['dist/**', 'lib/**', 'node_modules/**', '__tests__/fixtures/**', 'eslint.config.mjs'],
+  },
+
+  // Base ESLint recommended rules
+  eslint.configs.recommended,
+
+  // TypeScript ESLint recommended rules
+  ...tseslint.configs.recommended,
+
+  // GitHub plugin recommended rules
+  github.getFlatConfigs().recommended,
+
+  // Configuration for CommonJS JavaScript files
+  {
+    files: ['**/*.js'],
+    languageOptions: {
+      ecmaVersion: 2019,
+      sourceType: 'script',
+      globals: {
+        ...globals.node,
+        ...globals.es6,
+      },
+    },
+    rules: {
+      // Disable specific rules for CommonJS files
+      'github/filenames-match-regex': 'off',
+      'import/no-commonjs': 'off',
+      '@typescript-eslint/no-require-imports': 'off',
+      'i18n-text/no-en': 'off',
+      'import/no-namespace': 'off',
+      'no-implicit-globals': 'off',
+      'github/no-implicit-buggy-globals': 'off',
+    },
+  },
+
+  // Configuration for TypeScript files
+  {
+    files: ['**/*.ts'],
+    languageOptions: {
+      parser: tseslint.parser,
+      parserOptions: {
+        ecmaVersion: 2019,
+        sourceType: 'module',
+      },
+      globals: {
+        ...globals.node,
+        ...globals.es6,
+      },
+    },
+    rules: {
+      // Disable specific rules as in the original config
+      'github/filenames-match-regex': 'off',
+      'github/no-then': 'off',
+      'i18n-text/no-en': 'off',
+      'import/no-namespace': 'off',
+    },
+  },
+
+  // Jest-specific configuration
+  {
+    files: ['**/*.test.ts', '**/*.test.js', '__tests__/**/*.ts'],
+    ...jest.configs['flat/recommended'],
+    languageOptions: {
+      globals: {
+        ...globals.jest,
+      },
+    },
+  },
+]

package.json

@@ -15,21 +15,24 @@
     "npm": ">= 8.0.0"
   },
   "devDependencies": {
+    "@eslint/js": "^9.39.1",
     "@github/prettier-config": "^0.0.6",
     "@types/jest": "^30.0.0",
-    "@types/node": "24.5.2",
-    "@typescript-eslint/eslint-plugin": "^7.14.1",
-    "@typescript-eslint/parser": "^7.18.0",
+    "@types/node": "^24.10.1",
+    "@typescript-eslint/eslint-plugin": "^8.47.0",
+    "@typescript-eslint/parser": "^8.47.0",
     "@vercel/ncc": "^0.38.3",
     "concurrently": "^9.2.1",
-    "eslint": "^8.57.0",
-    "eslint-plugin-github": "^5.0.1",
-    "eslint-plugin-jest": "^28.11.0",
+    "eslint": "^9.39.1",
+    "eslint-plugin-github": "^6.0.0",
+    "eslint-plugin-jest": "^29.1.0",
     "eslint-plugin-prettier": "^5.2.5",
+    "globals": "^15.14.0",
     "jest": "^30.2.0",
     "prettier": "3.6.2",
     "ts-jest": "^29.4.5",
-    "typescript": "^5.5.2"
+    "typescript": "^5.9.3",
+    "typescript-eslint": "^8.47.0"
   },
   "keywords": [
     "actions",