chore: migrate tooling configs to ESM format

.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
-  }
-};

eslint.config.mjs

@@ -0,0 +1,59 @@
+// 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 tseslint from 'typescript-eslint';
+import jest from 'eslint-plugin-jest';
+import prettier from 'eslint-config-prettier';
+
+export default tseslint.config(
+  js.configs.recommended,
+  ...tseslint.configs.recommended,
+  prettier,
+  {
+    ignores: ['node_modules/**', 'dist/**', 'lib/**', 'coverage/**']
+  },
+  {
+    files: ['**/*.ts'],
+    languageOptions: {
+      ecmaVersion: 2022,
+      sourceType: 'module'
+    },
+    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}]
+    }
+  },
+  {
+    files: ['**/*.test.ts', '**/*.spec.ts'],
+    plugins: {
+      jest
+    },
+    languageOptions: {
+      globals: jest.environments.globals.globals
+    },
+    rules: {
+      ...jest.configs.recommended.rules,
+      '@typescript-eslint/no-unused-vars': 'off',
+      'jest/no-standalone-expect': 'off',
+      'jest/no-conditional-expect': 'off',
+      'no-console': 'off'
+    }
+  }
+);

package.json

@@ -9,10 +9,10 @@
   },
   "scripts": {
     "build": "ncc build -o dist/setup src/setup-python.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": "prettier --no-error-on-unmatched-pattern --config ./.prettierrc.cjs --write \"**/*.{ts,yml,yaml}\"",
-    "format-check": "prettier --no-error-on-unmatched-pattern --config ./.prettierrc.js --check \"**/*.{ts,yml,yaml}\"",
+    "format-check": "prettier --no-error-on-unmatched-pattern --config ./.prettierrc.cjs --check \"**/*.{ts,yml,yaml}\"",
-    "lint": "eslint --config ./.eslintrc.js \"**/*.ts\"",
+    "lint": "eslint \"**/*.ts\"",
-    "lint:fix": "eslint --config ./.eslintrc.js \"**/*.ts\" --fix",
+    "lint:fix": "eslint \"**/*.ts\" --fix",
     "release": "ncc build -o dist/setup src/setup-python.ts && ncc build -o dist/cache-save src/cache-save.ts && git add -f dist/",
     "test": "jest --runInBand --coverage"
   },
@@ -32,27 +32,26 @@
     "@actions/core": "^2.0.1",
     "@actions/exec": "^2.0.0",
     "@actions/glob": "^0.5.0",
-    "@actions/http-client": "^3.0.0",
+    "@actions/http-client": "^2.2.3",
     "@actions/io": "^2.0.0",
     "@actions/tool-cache": "^2.0.2",
     "@iarna/toml": "^3.0.0",
     "semver": "^7.7.1"
   },
   "devDependencies": {
-    "@types/jest": "^29.5.12",
+    "@eslint/js": "^9.39.2",
+    "@types/jest": "^30.0.0",
     "@types/node": "^24.10.1",
     "@types/semver": "^7.7.0",
-    "@typescript-eslint/eslint-plugin": "^5.54.0",
-    "@typescript-eslint/parser": "^5.54.0",
     "@vercel/ncc": "^0.38.3",
-    "eslint": "^8.57.0",
+    "eslint": "^9.39.2",
-    "eslint-config-prettier": "^8.6.0",
+    "eslint-config-prettier": "^10.1.8",
-    "eslint-plugin-jest": "^27.9.0",
+    "eslint-plugin-jest": "^29.12.2",
-    "eslint-plugin-node": "^11.1.0",
+    "jest": "^30.2.0",
-    "jest": "^29.7.0",
+    "jest-circus": "^30.2.0",
-    "jest-circus": "^29.7.0",
     "prettier": "^3.6.2",
     "ts-jest": "^29.3.2",
-    "typescript": "^5.9.3"
+    "typescript": "^5.9.3",
+    "typescript-eslint": "^8.54.0"
   }
 }

src/setup-python.ts

@@ -29,7 +29,7 @@ async function installPipPackages(pipInstall: string) {
     const installArgs = pipInstall.trim().split(/\s+/);
     await exec('python', ['-m', 'pip', 'install', ...installArgs]);
     core.info('Successfully installed pip packages');
-  } catch (error) {
+  } catch {
     core.setFailed(
       `Failed to install pip packages from "${pipInstall}". Please verify that the package names, versions, or requirements files provided are correct and installable, that the specified packages and versions can be resolved from PyPI or the configured package index, and that your network connection is stable and allows access to the package index.`
     );