.eslintrc.js

module.exports = {
  parser: 'babel-eslint',
  env: {
    browser: true,
    node: true,
    jest: true,
  },
  extends: 'airbnb',
  rules: {
    semi: ['error', 'never'],
    'no-console': process.env.NODE_ENV === 'production' ? 'error' : 'off',
    'no-debugger': process.env.NODE_ENV === 'production' ? 'error' : 'off',
    'arrow-parens': ['error', 'as-needed'],
    'import/prefer-default-export': 'off',
    'no-restricted-syntax': ['error', 'ForOfLoop'],
    'no-plusplus': ['error', { allowForLoopAfterthoughts: true }],
    'no-continue': 'off',
    'vars-on-top': 'off', // for-loop micro-optimization
  },
}