eslint-flat-config-airbnb/base/variables.js

A mostly reasonable approach to JavaScript and React using Airbnb's ESLint config, updated for ESLint 9+

import confusingBrowserGlobals from 'confusing-browser-globals';

const variables = {
    rules: {
        'init-declarations': 'off',
        'no-catch-shadow': 'off',
        'no-delete-var': 'error',
        'no-label-var': 'error',
        'no-restricted-globals': [
            'error',
            {
                name: 'isFinite',
                message: 'Use Number.isFinite instead https://github.com/airbnb/javascript#standard-library--isfinite',
            },
            {
                name: 'isNaN',
                message: 'Use Number.isNaN instead https://github.com/airbnb/javascript#standard-library--isnan',
            },
        ].concat(confusingBrowserGlobals.map((g) => ({
            name: g,
            message: `Use window.${g} instead. https://github.com/facebook/create-react-app/blob/HEAD/packages/confusing-browser-globals/README.md`,
        }))),
        'no-shadow': 'error',
        'no-shadow-restricted-names': 'error',
        'no-undef': 'error',
        'no-undef-init': 'error',
        'no-undefined': 'off',
        'no-unused-vars': ['error', { vars: 'all', args: 'after-used', ignoreRestSiblings: true }],
        'no-use-before-define': ['error', { functions: true, classes: true, variables: true }],
    },
};

export default variables;