.eslintrc.js

module.exports = {
  env: {
    es6: true,
    node: true,
    browser: true
  },
  parserOptions: {
    ecmaVersion: 8,
    sourceType: 'module',
    ecmaFeatures: {
      experimentalObjectRestSpread: true
    }
  },
  parser: 'babel-eslint',
  extends: ['eslint:recommended', 'react-app', '@hellomouse'],
  rules: {
    'padded-blocks': [
      'error',
      {
        blocks: 'never'
      }
    ],
    'one-var': 'off',
    'space-unary-ops': [
      'error',
      {
        words: true,
        nonwords: false
      }
    ],
    'padding-line-between-statements': [
      'error',
      { blankLine: 'always', prev: '*', next: 'return' },
      { blankLine: 'always', prev: ['const', 'let'], next: '*' },
      { blankLine: 'any', prev: ['const', 'let'], next: ['const', 'let'] }
    ],
    'no-shadow': 'error',
    'no-useless-return': 'error',
    'block-scoped-var': 'error',
    'no-else-return': 'error',
    'no-undef-init': 'error'
  }
};