.eslintrc.js

module.exports = {
  env: {
    browser: true,
    commonjs: true,
    es6: true,
    node: true,
    jest: true,
    webextensions: true,
  },
  extends: 'eslint:recommended',
  parser: 'babel-eslint',
  parserOptions: {
    sourceType: 'module',
    ecmaVersion: 2018,
    ecmaFeatures: {
      jsx: true,
    },
  },
  plugins: ['react'],
  rules: {
    'no-console': 'off',
    'no-underscore-dangle': 'off',
    'no-plusplus': 'off',
    'no-continue': 'off',
    camelcase: 'off',
    'no-empty': 'off',
    'no-param-reassign': 'off',
    'func-names': ['error', 'never'],
    'prefer-destructuring': [
      'error',
      {
        object: false,
        array: false,
      },
    ],
    indent: ['error', 2, { SwitchCase: 1 }],
    'linebreak-style': ['error', 'unix'],
    quotes: ['error', 'single', { allowTemplateLiterals: true }],
    semi: ['error', 'always'],
    'react/jsx-uses-vars': 1,
    'react/jsx-uses-react': 1,
    'spaced-comment': ['error', 'always', { exceptions: ['-', '+'] }],
  },
};