.eslintrc.js

module.exports = {
    env: {
        jest: true,
        browser: true,
        es6: true,
        node: true
    },
    extends: 'airbnb',
    parser: 'babel-eslint',
    parserOptions: {
      ecmaVersion: 8,
      sourceType: 'module',
    },
    rules: {
      'no-param-reassign': 'off', /* sadly, we have to reassign params to deal with props */
      'import/prefer-default-export': 'off', /* named exports allow for treeshaking */
      'no-restricted-syntax': [ /* we're omitting for of loops for this. they're pretty neat! */
        '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.',
        },
      ],
      'no-loop-func': 'off', /* we create functions within a loop to close over our actions. this is intentional! */
      'linebreak-style': 'off', /* we accept those of all line endings */
    }
};