Upgrade to eslint 9.

.eslintignore

@@ -1,4 +0,0 @@
-dist/
-lib/
-node_modules/
-jest.config.js

.eslintrc.json

@@ -1,55 +0,0 @@
-{
-    "plugins": ["jest", "@typescript-eslint"],
-    "extends": ["plugin:github/recommended"],
-    "parser": "@typescript-eslint/parser",
-    "parserOptions": {
-      "ecmaVersion": 9,
-      "sourceType": "module",
-      "project": "./tsconfig.json"
-    },
-    "rules": {
-      "i18n-text/no-en": "off",
-      "eslint-comments/no-use": "off",
-      "import/no-namespace": "off",
-      "no-unused-vars": "off",
-      "@typescript-eslint/no-unused-vars": "error",
-      "@typescript-eslint/explicit-member-accessibility": ["error", {"accessibility": "no-public"}],
-      "@typescript-eslint/no-require-imports": "error",
-      "@typescript-eslint/array-type": "error",
-      "@typescript-eslint/await-thenable": "error",
-      "@typescript-eslint/ban-ts-comment": "error",
-      "camelcase": "off",
-      "@typescript-eslint/consistent-type-assertions": "error",
-      "@typescript-eslint/explicit-function-return-type": ["error", {"allowExpressions": true}],
-      "@typescript-eslint/func-call-spacing": ["error", "never"],
-      "@typescript-eslint/no-array-constructor": "error",
-      "@typescript-eslint/no-empty-interface": "error",
-      "@typescript-eslint/no-explicit-any": "error",
-      "@typescript-eslint/no-extraneous-class": "error",
-      "@typescript-eslint/no-for-in-array": "error",
-      "@typescript-eslint/no-inferrable-types": "error",
-      "@typescript-eslint/no-misused-new": "error",
-      "@typescript-eslint/no-namespace": "error",
-      "@typescript-eslint/no-non-null-assertion": "warn",
-      "@typescript-eslint/no-unnecessary-qualifier": "error",
-      "@typescript-eslint/no-unnecessary-type-assertion": "error",
-      "@typescript-eslint/no-useless-constructor": "error",
-      "@typescript-eslint/no-var-requires": "error",
-      "@typescript-eslint/prefer-for-of": "warn",
-      "@typescript-eslint/prefer-function-type": "warn",
-      "@typescript-eslint/prefer-includes": "error",
-      "@typescript-eslint/prefer-string-starts-ends-with": "error",
-      "@typescript-eslint/promise-function-async": "error",
-      "@typescript-eslint/require-array-sort-compare": "error",
-      "@typescript-eslint/restrict-plus-operands": "error",
-      "semi": "off",
-      "@typescript-eslint/semi": ["error", "never"],
-      "@typescript-eslint/type-annotation-spacing": "error",
-      "@typescript-eslint/unbound-method": "error"
-    },
-    "env": {
-      "node": true,
-      "es6": true,
-      "jest/globals": true
-    }
-  }

.prettierignore

@@ -1,3 +1,3 @@
 dist/
-lib/
 node_modules/
+README.md

.prettierrc.yml

@@ -0,0 +1,16 @@
+# See: https://prettier.io/docs/en/configuration
+
+printWidth: 80
+tabWidth: 2
+useTabs: false
+semi: false
+singleQuote: true
+quoteProps: as-needed
+jsxSingleQuote: false
+trailingComma: none
+bracketSpacing: true
+bracketSameLine: true
+arrowParens: always
+proseWrap: always
+htmlWhitespaceSensitivity: css
+endOfLine: lf

eslint.config.mjs

@@ -0,0 +1,81 @@
+// See: https://eslint.org/docs/latest/use/configure/configuration-files
+
+import {fixupPluginRules} from '@eslint/compat'
+import {FlatCompat} from '@eslint/eslintrc'
+import js from '@eslint/js'
+import typescriptEslint from '@typescript-eslint/eslint-plugin'
+import tsParser from '@typescript-eslint/parser'
+import _import from 'eslint-plugin-import'
+import jest from 'eslint-plugin-jest'
+import prettier from 'eslint-plugin-prettier'
+import globals from 'globals'
+import path from 'node:path'
+import {fileURLToPath} from 'node:url'
+
+const __filename = fileURLToPath(import.meta.url)
+const __dirname = path.dirname(__filename)
+const compat = new FlatCompat({
+  baseDirectory: __dirname,
+  recommendedConfig: js.configs.recommended,
+  allConfig: js.configs.all
+})
+
+export default [
+  {
+    ignores: ['**/coverage', '**/dist', '**/linter', '**/node_modules']
+  },
+  ...compat.extends(
+    'eslint:recommended',
+    'plugin:@typescript-eslint/eslint-recommended',
+    'plugin:@typescript-eslint/recommended',
+    'plugin:jest/recommended',
+    'plugin:prettier/recommended'
+  ),
+  {
+    plugins: {
+      import: fixupPluginRules(_import),
+      jest,
+      prettier,
+      '@typescript-eslint': typescriptEslint
+    },
+
+    languageOptions: {
+      globals: {
+        ...globals.node,
+        ...globals.jest,
+        Atomics: 'readonly',
+        SharedArrayBuffer: 'readonly'
+      },
+
+      parser: tsParser,
+      ecmaVersion: 2023,
+      sourceType: 'module',
+
+      parserOptions: {
+        project: ['tsconfig.eslint.json'],
+        tsconfigRootDir: '.'
+      }
+    },
+
+    settings: {
+      'import/resolver': {
+        typescript: {
+          alwaysTryTypes: true,
+          project: 'tsconfig.eslint.json'
+        }
+      }
+    },
+
+    rules: {
+      camelcase: 'off',
+      'eslint-comments/no-use': 'off',
+      'eslint-comments/no-unused-disable': 'off',
+      'i18n-text/no-en': 'off',
+      'import/no-namespace': 'off',
+      'no-console': 'off',
+      'no-shadow': 'off',
+      'no-unused-vars': 'off',
+      'prettier/prettier': 'error'
+    }
+  }
+]

package.json

@@ -5,14 +5,13 @@
   "description": "GitHub Action for GraalVM",
   "main": "lib/main.js",
   "scripts": {
-    "build": "tsc",
+    "bundle": "npm run format:write && npm run package",
-    "format": "prettier --write '**/*.ts'",
+    "format:write": "npx prettier --write .",
-    "format-check": "prettier --check '**/*.ts'",
+    "format:check": "npx prettier --check .",
-    "lint": "eslint src/**/*.ts",
+    "lint": "npx eslint .",
     "package": "ncc build -o dist/main src/main.ts && ncc build -o dist/cleanup src/cleanup.ts",
-    "test": "jest",
+    "test": "npx jest",
-    "all-but-test": "npm run build && npm run format && npm run lint && npm run package",
+    "all": "npm run format:write && npm run lint && npm run test && npm run coverage && npm run package"
-    "all": "npm run all-but-test && npm test"
   },
   "repository": {
     "type": "git",
@@ -42,6 +41,7 @@
     "uuid": "^11.0.5"
   },
   "devDependencies": {
+    "@eslint/compat": "^1.2.5",
     "@types/jest": "^29.5.14",
     "@types/node": "^20.17.12",
     "@types/semver": "^7.5.8",
@@ -49,9 +49,11 @@
     "@typescript-eslint/eslint-plugin": "^7.2.0",
     "@typescript-eslint/parser": "^7.2.0",
     "@vercel/ncc": "^0.38.3",
-    "eslint": "^8.57.0",
+    "eslint": "^9.18.0",
-    "eslint-plugin-github": "^4.10.2",
+    "eslint-config-prettier": "^9.1.0",
-    "eslint-plugin-jest": "^27.9.0",
+    "eslint-import-resolver-typescript": "^3.6.3",
+    "eslint-plugin-import": "^2.31.0",
+    "eslint-plugin-jest": "^28.10.0",
     "eslint-plugin-jsonc": "^2.18.2",
     "eslint-plugin-node": "^11.1.0",
     "eslint-plugin-prettier": "^5.2.3",

tsconfig.base.json

@@ -0,0 +1,23 @@
+{
+  "$schema": "https://json.schemastore.org/tsconfig",
+  "compilerOptions": {
+    "allowSyntheticDefaultImports": true,
+    "declaration": true,
+    "declarationMap": false,
+    "esModuleInterop": true,
+    "forceConsistentCasingInFileNames": true,
+    "lib": ["ES2022"],
+    "module": "NodeNext",
+    "moduleResolution": "NodeNext",
+    "newLine": "lf",
+    "noImplicitAny": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": false,
+    "pretty": true,
+    "resolveJsonModule": true,
+    "sourceMap": true,
+    "strict": true,
+    "strictNullChecks": true,
+    "target": "ES2022"
+  }
+}

tsconfig.eslint.json

@@ -0,0 +1,16 @@
+{
+  "$schema": "https://json.schemastore.org/tsconfig",
+  "extends": "./tsconfig.base.json",
+  "compilerOptions": {
+    "allowJs": true,
+    "noEmit": true
+  },
+  "exclude": ["dist", "node_modules"],
+  "include": [
+    "__fixtures__",
+    "__tests__",
+    "src",
+    "eslint.config.mjs",
+    "jest.config.js"
+  ]
+}

tsconfig.json

@@ -1,12 +1,11 @@
 {
+  "$schema": "https://json.schemastore.org/tsconfig",
+  "extends": "./tsconfig.base.json",
   "compilerOptions": {
-    "target": "es6",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'. */
+    "module": "NodeNext",
-    "module": "commonjs",                     /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
+    "moduleResolution": "NodeNext",
-    "outDir": "./lib",                        /* Redirect output structure to the directory. */
+    "outDir": "./dist"
-    "rootDir": "./src",                       /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
-    "strict": true,                           /* Enable all strict type-checking options. */
-    // "noImplicitAny": true,                    /* Raise error on expressions and declarations with an implied 'any' type. */
-    "esModuleInterop": true                   /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
   },
-  "exclude": ["node_modules", "**/*.test.ts"]
+  "exclude": ["__fixtures__", "__tests__", "coverage", "dist", "node_modules"],
+  "include": ["src"]
 }