.eslintrc.js

module.exports = {
    'parser': '@typescript-eslint/parser',
    'parserOptions': {
        'ecmaVersion': 6,
        'sourceType': 'module',
        'ecmaFeatures': {
            'jsx': true
        }
    },
    'plugins': [
        'react',
        'react-hooks',
        'formatjs',
        '@typescript-eslint'
    ],
    'extends': [
        'eslint:recommended',
        'plugin:react/recommended',
        'prettier',
        'plugin:@typescript-eslint/recommended'
    ],
    'globals': {
        'console': 'readonly',
        'document': 'readonly',
        'DISQUS': 'readonly',
        'fetch': 'readonly',
        'history': 'readonly',
        'piTracker': 'readonly',
        'pi': 'readonly',
        'process': 'readonly',
        'Promise': 'readonly',
        'Reflect': 'readonly',
        'require': 'readonly',
        'window': 'readonly'
    },
    'overrides': [
        {
            'files': ['src/**/*.js', 'src/**/*.jsx']
        }
    ],
    'ignorePatterns': ['src/vendor/**/*.js', 'src/settings.js'],
    'settings': {
        'react': {
            'version': 'detect'
        }
    },
    'rules': {
        // Best Practices
        'accessor-pairs': ['error', {'getWithoutSet': false}],
        'block-scoped-var': 'error',
        'comma-dangle': ['error', 'never'],
        'complexity': ['error', 5],
        'consistent-return': 'error',
        'curly': ['error', 'all'],
        'default-case': 'error',
        'dot-location': ['error', 'property'],
        'dot-notation': ['error', {'allowKeywords': true }],
        'eqeqeq': 'error',
        'global-require': 'error',
        'guard-for-in': 'error',
        'no-alert': 'error',
        'no-caller': 'error',
        'no-case-declarations': 'error',
        'no-div-regex': 'error',
        'no-else-return': 'error',
        'no-empty-pattern': 'error',
        'no-eq-null': 'error',
        'no-eval': 'error',
        'no-extend-native': 'error',
        'no-extra-bind': 'error',
        'no-fallthrough': 'error',
        'no-floating-decimal': 'error',
        'no-implied-eval': 'error',
        'no-iterator': 'error',
        'no-labels': 'error',
        'no-lone-blocks': 'error',
        'no-loop-func': 'error',
        'no-multi-spaces': 'error',
        'no-multi-str': 'error',
        'no-native-reassign': 'error',
        'no-new-wrappers': 'error',
        'no-new': 'error',
        'no-octal': 'error',
        'no-octal-escape': 'error',
        'no-proto': 'error',
        'no-redeclare': 'error',
        'no-return-assign': 'error',
        'no-script-url': 'error',
        'no-self-compare': 'error',
        'no-sequences': 'error',
        'no-throw-literal': 'error',
        'no-unmodified-loop-condition': 'error',
        'no-unused-expressions': ['error', {allowShortCircuit: true, allowTernary: true}],
        'no-useless-call': 'error',
        'no-useless-concat': 'error',
        'no-useless-escape': 'error',
        'no-void': 'error',
        'no-warning-comments': ['warn', {'terms': ['fix', 'hack', 'todo', 'xxx'], 'location': 'anywhere'}],
        'no-with': 'error',
        'radix': ['error', 'always'],
        'vars-on-top': 'error',
        'wrap-iife': ['error', 'inside'],

        // Strict Mode
        'strict': ['error', 'never'],

        // Variables
        'no-catch-shadow': 'error',
        'no-delete-var': 'error',
        'no-label-var': 'error',
        'no-shadow-restricted-names': 'error',
        'no-shadow': 'error',
        'no-undef-init': 'error',
        'no-use-before-define': 'off',
        '@typescript-eslint/no-use-before-define': ['error', {
            'functions': false,
            'variables': false
        }],

        // Stylistic
        'array-bracket-spacing': ['error', 'never'],
        'block-spacing': ['error', 'never'],
        'brace-style': ['error', '1tbs', {'allowSingleLine': true }],
        'camelcase': 'error',
        'comma-spacing': ['error', {'before': false, 'after': true}],
        'comma-style': ['error', 'last'],
        'computed-property-spacing': ['error', 'never'],
        'eol-last': 'error',
        'key-spacing': ['error', {'beforeColon': false, 'afterColon': true}],
        'keyword-spacing': 'error',
        'linebreak-style': ['error', 'unix'],
        'max-depth': ['error', 4],
        'max-len': ['error', 120, 4, {'ignoreUrls': true}],
        'max-nested-callbacks': ['error', 3],
        'max-params': ['error', 4],
        'new-cap': 'error',
        'new-parens': 'error',
        'no-array-constructor': 'error',
        'no-implicit-globals': 'error',
        'no-lonely-if': 'error',
        'no-mixed-spaces-and-tabs': ['error', false],
        'no-multiple-empty-lines': ['error', {'max': 2, 'maxEOF': 1}],
        'no-nested-ternary': 'error',
        'no-new-object': 'error',
        'no-spaced-func': 'error',
        'no-trailing-spaces': 'error',
        'no-whitespace-before-property': 'error',
        'one-var': ['error', 'never'],
        'operator-linebreak': 'off',
        'padded-blocks': ['error', {
            'blocks': 'never',
            'switches': 'never',
            'classes': 'always'
        }],
        'padding-line-between-statements': [
            'error',
            {'blankLine': 'always', 'prev': 'let', 'next': '*'},
            {'blankLine': 'always', 'prev': 'const', 'next': '*'},
            {'blankLine': 'any', 'prev': 'let', 'next': 'let'},
            {'blankLine': 'any', 'prev': 'let', 'next': 'const'},
            {'blankLine': 'any', 'prev': 'const', 'next': 'let'},
            {'blankLine': 'any', 'prev': 'const', 'next': 'const'}
        ],
        'quotes': ['error', 'single', {'avoidEscape': true, 'allowTemplateLiterals': false}],
        'semi-spacing': ['error', {'before': false, 'after': true}],
        'semi': ['error', 'always'],
        'space-before-blocks': ['error', 'always'],
        'space-before-function-paren': ['error', {'anonymous': 'always', 'named': 'never'}],
        'spaced-comment': ['error', 'always', {'exceptions': ['-*'] }],
        'space-in-parens': ['error', 'never'],
        'wrap-regex': 'error',

        // ECMAScript 2015
        'arrow-parens': ['error', 'always'],
        'arrow-spacing': 'error',
        'constructor-super': 'error',
        'generator-star-spacing': ['error', {'before': true, 'after': false}],
        'no-class-assign': 'error',
        'no-const-assign': 'error',
        'no-dupe-class-members': 'error',
        'no-duplicate-imports': 'error',
        'no-new-symbol': 'error',
        'no-this-before-super': 'error',
        'no-unused-vars': 'off',
        '@typescript-eslint/no-unused-vars': ['error', {'varsIgnorePattern': '_'}],
        'no-useless-computed-key': 'error',
        'no-useless-constructor': 'error',
        'no-useless-rename': 'error',
        'no-var': 'error',
        'object-shorthand': ['error', 'always', {'avoidQuotes': true}],
        'prefer-arrow-callback': 'error',
        'prefer-const': ['error', {
            'destructuring': 'any',
            'ignoreReadBeforeAssign': false
        }],
        'prefer-reflect': ['error', {'exceptions': ['delete']}],
        'prefer-rest-params': 'error',
        'prefer-spread': 'error',
        'prefer-template': 'error',
        'react-hooks/rules-of-hooks': 'error',
        'react-hooks/exhaustive-deps': 'error',
        'require-yield': 'error',
        'rest-spread-spacing': ['error', 'never'],
        'template-curly-spacing': ['error', 'never'],
        'yield-star-spacing': ['error', {'before': false, 'after': true}],

        'react/jsx-curly-newline': ['error', 'consistent'],
        'react/jsx-curly-brace-presence': ['error', 'never'],
        'react/jsx-equals-spacing': ['error', 'never'],
        'react/jsx-first-prop-new-line': ['error', 'multiline'],
        'react/jsx-key': 'error',
        'react/jsx-no-target-blank': 'error',
        'react/jsx-tag-spacing': 'error',
        'react/jsx-uses-vars': 'error',
        'react/jsx-uses-react': 'error',
        'react/prop-types': 'off',
        'react/no-children-prop': 'off',
        'react/no-unknown-property': ['error', { 'ignore': ['css'] }]
    }
};