eslint-flat-config-airbnb/base/best-practices.js

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

import stylistic from '@stylistic/eslint-plugin';

const bestPractices = {
    plugins: {
        '@stylistic': stylistic,
    },
    rules: {
        'accessor-pairs': 'off',
        'array-callback-return': ['error', { allowImplicit: true }],
        'block-scoped-var': 'error',
        complexity: ['off', 20],
        'class-methods-use-this': ['error', { exceptMethods: [] }],
        'consistent-return': 'error',
        curly: ['error', 'multi-line'],
        'default-case': ['error', { commentPattern: '^no default$' }],
        'default-case-last': 'error',
        'default-param-last': 'error',
        'dot-notation': ['error', { allowKeywords: true }],
        '@stylistic/dot-location': ['error', 'property'],
        eqeqeq: ['error', 'always', { null: 'ignore' }],
        'grouped-accessor-pairs': 'error',
        'guard-for-in': 'error',
        'max-classes-per-file': ['error', 1],
        'no-alert': 'warn',
        'no-caller': 'error',
        'no-case-declarations': 'error',
        'no-constructor-return': 'error',
        'no-div-regex': 'off',
        'no-else-return': ['error', { allowElseIf: false }],
        'no-empty-function': ['error', { allow: ['arrowFunctions', 'functions', 'methods'] }],
        'no-empty-pattern': 'error',
        'no-empty-static-block': 'off',
        'no-eq-null': 'off',
        'no-eval': 'error',
        'no-extend-native': 'error',
        'no-extra-bind': 'error',
        'no-extra-label': 'error',
        'no-fallthrough': 'error',
        '@stylistic/no-floating-decimal': 'error',
        'no-global-assign': ['error', { exceptions: [] }],
        '@stylistic/no-native-reassign': 'off',
        'no-implicit-coercion': ['off', {
            boolean: false, number: true, string: true, allow: [],
        }],
        'no-implicit-globals': 'off',
        'no-implied-eval': 'error',
        'no-invalid-this': 'off',
        'no-iterator': 'error',
        'no-labels': ['error', { allowLoop: false, allowSwitch: false }],
        'no-lone-blocks': 'error',
        'no-loop-func': 'error',
        'no-magic-numbers': ['off', {
            ignore: [], ignoreArrayIndexes: true, enforceConst: true, detectObjects: false,
        }],
        '@stylistic/no-multi-spaces': ['error', { ignoreEOLComments: false }],
        'no-multi-str': 'error',
        'no-new': 'error',
        'no-new-func': 'error',
        'no-new-wrappers': 'error',
        'no-nonoctal-decimal-escape': 'error',
        'no-object-constructor': 'off',
        'no-octal': 'error',
        'no-octal-escape': 'error',
        'no-param-reassign': ['error', {
            props: true,
            ignorePropertyModificationsFor: [
                'acc', 'accumulator', 'e', 'ctx', 'context', 'req', 'request', 'res', 'response', '$scope', 'staticContext',
            ],
        }],
        'no-proto': 'error',
        'no-redeclare': 'error',
        'no-restricted-properties': ['error',
            { object: 'arguments', property: 'callee', message: 'arguments.callee is deprecated' },
            { object: 'global', property: 'isFinite', message: 'Please use Number.isFinite instead' },
            { object: 'self', property: 'isFinite', message: 'Please use Number.isFinite instead' },
            { object: 'window', property: 'isFinite', message: 'Please use Number.isFinite instead' },
            { object: 'global', property: 'isNaN', message: 'Please use Number.isNaN instead' },
            { object: 'self', property: 'isNaN', message: 'Please use Number.isNaN instead' },
            { object: 'window', property: 'isNaN', message: 'Please use Number.isNaN instead' },
            { property: '__defineGetter__', message: 'Please use Object.defineProperty instead.' },
            { property: '__defineSetter__', message: 'Please use Object.defineProperty instead.' },
            { object: 'Math', property: 'pow', message: 'Use the exponentiation operator (**) instead.' },
        ],
        'no-return-assign': ['error', 'always'],
        'no-script-url': 'error',
        'no-self-assign': ['error', { props: true }],
        'no-self-compare': 'error',
        'no-sequences': 'error',
        'no-throw-literal': 'error',
        'no-unmodified-loop-condition': 'off',
        'no-unused-expressions': ['error', { allowShortCircuit: false, allowTernary: false, allowTaggedTemplates: false }],
        'no-unused-labels': 'error',
        'no-useless-call': 'off',
        'no-useless-catch': 'error',
        'no-useless-concat': 'error',
        'no-useless-escape': 'error',
        'no-useless-return': 'error',
        'no-void': 'error',
        'no-warning-comments': ['off', { terms: ['todo', 'fixme', 'xxx'], location: 'start' }],
        'no-with': 'error',
        'prefer-promise-reject-errors': ['error', { allowEmptyReject: true }],
        'prefer-named-capture-group': 'off',
        'prefer-object-has-own': 'off',
        'prefer-regex-literals': ['error', { disallowRedundantWrapping: true }],
        radix: 'error',
        'require-await': 'off',
        'require-unicode-regexp': 'off',
        'vars-on-top': 'error',
        '@stylistic/wrap-iife': ['error', 'outside', { functionPrototypeMethods: false }],
        yoda: 'error',
    },
};

export default bestPractices;