.eslintrc.js

module.exports = {
  extends: 'airbnb-base',
  rules: {
    // https://blog.neufund.org/why-we-have-banned-default-exports-and-you-should-do-the-same-d51fdc2cf2ad
    'import/prefer-default-export': 'off',
    'import/no-default-export': 'error',
    // Maybe use separate classes later
    'max-classes-per-file': 'off',
    'no-restricted-syntax': [
      'error',
      {
        selector: 'ForInStatement',
        message: 'for..in loops iterate over the entire prototype chain, which is virtually never what you want. Use Object.{keys,values,entries}, and iterate over the resulting array.',
      },
      {
        selector: 'LabeledStatement',
        message: 'Labels are a form of GOTO; using them makes code confusing and hard to maintain and understand.',
      },
      {
        selector: 'WithStatement',
        message: '`with` is disallowed in strict mode because it makes code impossible to predict and optimize.',
      },
    ],
    // Because base cases are awesome.
    'no-continue': 'off',
  },
};