Apply 'npx @eslint/migrate-config .eslintrc.json'

And the suggested 'npm install globals @eslint/js @eslint/eslintrc -D'

Author: Pierre-Sassoulas

.eslintrc.json

@@ -59,6 +59,10 @@ repos:
         additional_dependencies:
           - [email protected]
           - [email protected]
+          - [email protected]
+          - "@eslint/[email protected]"
+          - "@eslint/[email protected]"
+
         args: ["--fix"]
   - repo: https://github.com/pre-commit/mirrors-mypy
     rev: v1.14.1

.pre-commit-config.yaml

@@ -0,0 +1,79 @@
+import globals from 'globals'
+import path from 'node:path'
+import { fileURLToPath } from 'node:url'
+import js from '@eslint/js'
+import { FlatCompat } from '@eslint/eslintrc'
+
+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 [...compat.extends('google'), {
+    languageOptions: {
+        globals: {
+            ...globals.browser,
+            ...globals.commonjs,
+        },
+
+        ecmaVersion: 'latest',
+        sourceType: 'script',
+    },
+
+    rules: {
+        'array-bracket-spacing': 'error',
+        'block-scoped-var': 'error',
+        'block-spacing': 'error',
+        'brace-style': 'error',
+        'camelcase': 'off',
+        'class-methods-use-this': 'error',
+        'consistent-return': 'error',
+        'default-case': 'error',
+        'default-case-last': 'error',
+        'default-param-last': 'error',
+        'grouped-accessor-pairs': 'error',
+        'indent': ['error', 4],
+        'linebreak-style': ['error', 'unix'],
+
+        'max-len': ['error', {
+            code: 120,
+        }],
+
+        'no-caller': 'error',
+        'no-console': 'error',
+        'no-empty-function': 'error',
+        'no-eval': 'error',
+        'no-extra-parens': 'error',
+        'no-labels': 'error',
+        'no-new': 'error',
+        'no-new-func': 'error',
+        'no-new-wrappers': 'error',
+        'no-return-await': 'error',
+        'no-script-url': 'error',
+        'no-self-compare': 'error',
+        'no-shadow': 'error',
+        'no-throw-literal': 'error',
+        'no-undefined': 'error',
+        'no-unreachable-loop': 'error',
+        'no-unused-expressions': 'off',
+        'no-useless-backreference': 'error',
+        'no-useless-concat': 'error',
+        'no-var': 'error',
+
+        'object-curly-spacing': ['error', 'always', {
+            arraysInObjects: true,
+        }],
+
+        'prefer-const': 'error',
+        'prefer-promise-reject-errors': 'error',
+        'require-atomic-updates': 'error',
+        'require-await': 'error',
+        'require-jsdoc': 0,
+        'semi': ['error', 'never'],
+        'quotes': ['error', 'single'],
+        'yoda': 'error',
+    },
+}]

eslint.config.mjs

@@ -8,10 +8,13 @@
     "all": "npm run lint && npm run unit && npm run build:css && npm run build:jsapp"
   },
   "devDependencies": {
+    "@eslint/eslintrc": "^3.2.0",
+    "@eslint/js": "^9.20.0",
     "browserify": "^17.0.0",
     "chai": "^4.3.6",
     "eslint": "^9.20.0",
     "eslint-config-google": "^0.14.0",
+    "globals": "^15.14.0",
     "mocha": "^10.0.0",
     "mock-local-storage": "^1.1.24",
     "nyc": "^17.1.0",