.eslintrc.js

// https://eslint.org/docs/user-guide/configuring

module.exports = {
  ignorePatterns: ['getting-started/dist'],
  extends: ['eslint:recommended', 'plugin:react/recommended'],
  env: {
    browser: true,
    es6: true,
    node: true,
    jest: true,
  },
  parserOptions: {
    sourceType: 'module',
    ecmaVersion: 2018,
  },
  settings: {
    react: {
      version: 'detect',
    },
  },
  rules: {
    'array-bracket-spacing': 'error',
    'array-callback-return': 'error',
    'arrow-parens': ['error', 'as-needed'],
    'arrow-spacing': 'error',
    'block-scoped-var': 'error',
    'block-spacing': 'error',
    'brace-style': [
      'error',
      '1tbs',
      {
        allowSingleLine: true,
      },
    ],
    camelcase: 'off',
    'comma-dangle': 'off',
    'comma-spacing': [
      'error',
      {
        before: false,
        after: true,
      },
    ],
    'comma-style': 'error',
    'computed-property-spacing': 'error',
    'consistent-return': 2,
    curly: ['error', 'multi-or-nest', 'consistent'],
    'dot-location': ['error', 'property'],
    'dot-notation': 'error',
    'eol-last': 'error',
    eqeqeq: 'error',
    'func-call-spacing': 'error',
    // let prettier do its thing
    indent: ['off', 2],
    'key-spacing': 'error',
    'keyword-spacing': 'error',
    'linebreak-style': 'error',
    'no-alert': 'error',
    'no-caller': 'error',
    'no-duplicate-imports': 'error',
    'no-else-return': 'error',
    'no-empty-function': 'error',
    'no-eval': 2,
    'no-extend-native': 2,
    'no-extra-bind': 2,
    'no-extra-label': 2,
    'no-implicit-coercion': 'error',
    'no-implicit-globals': 'error',
    'no-implied-eval': 'error',
    'no-invalid-this': 'error',
    'no-iterator': 'error',
    'no-labels': 'error',
    'no-lone-blocks': 'error',
    'no-lonely-if': 'error',
    'no-loop-func': 'error',
    'no-multiple-empty-lines': [
      'error',
      {
        max: 1,
        maxBOF: 0,
      },
    ],
    'no-multi-spaces': 'error',
    'no-new': 'off',
    'no-new-func': 'error',
    'no-new-wrappers': 'error',
    'no-param-reassign': 'error',
    'no-proto': 'error',
    'no-return-assign': 'error',
    'no-self-compare': 'error',
    'no-sequences': 'error',
    'no-tabs': 'error',
    'no-throw-literal': 'error',
    'no-trailing-spaces': 'error',
    'no-unneeded-ternary': 'error',
    'no-unused-expressions': 'error',
    'no-unused-vars': ['error', { ignoreRestSiblings: true }],
    'no-useless-call': 'error',
    'no-useless-computed-key': 'error',
    'no-useless-concat': 'error',
    'no-useless-constructor': 'error',
    'no-useless-escape': 'error',
    'no-useless-rename': 'error',
    'no-useless-return': 'error',
    'no-var': 'error',
    'no-void': 'error',
    'no-whitespace-before-property': 'error',
    'object-curly-newline': 'off',
    'object-curly-spacing': ['error', 'always'],
    'object-property-newline': 'off',
    'object-shorthand': 'error',
    'operator-assignment': 'error',
    'prefer-arrow-callback': 'error',
    'prefer-const': 'error',
    'prefer-destructuring': 'error',
    'prefer-rest-params': 'error',
    'prefer-spread': 'error',
    'prefer-template': 'error',
    'quote-props': ['error', 'consistent-as-needed'],
    // let prettier do its thing
    quotes: ['off'],
    'require-await': 'error',
    'rest-spread-spacing': 'error',
    semi: 'off',
    'sort-imports': 'off',
    'space-before-blocks': 'error',
    'space-before-function-paren': [
      'error',
      {
        anonymous: 'never',
        named: 'never',
        asyncArrow: 'always',
      },
    ],
    'space-in-parens': 'error',
    'space-infix-ops': 'error',
    'spaced-comment': 'error',
    'template-curly-spacing': 'error',
    'valid-jsdoc': 'error',
    'wrap-iife': 'error',
  },
};