.eslintrc

{
  "parser": "babel-eslint",
  "env": {
    "browser": true,
    "node": true,
    "commonjs": true,
    "es6": true
  },
  "rules": {
    "flowtype-errors/show-errors": 2,
    // Style / cleanliness
    "indent": ["error", 2, { "SwitchCase": 1 }],
    "no-var": ["error"],
    "arrow-parens": ["error"],
    "no-duplicate-imports": ["error"],
    "one-var": ["error", "never"],
    "camelcase": ["error"],

    // Logic / errors / performance
    "semi": ["error", "always"],
    "no-undef": ["error"],
    "prefer-const": ["error"],
    "no-const-assign": ["error"],
    "wrap-iife": ["error"],
    "no-loop-func": ["error"],
    "no-param-reassign": ["error"],
    "prefer-spread": ["error"],
    "prefer-arrow-callback": ["error"],
    "no-confusing-arrow": ["error"],
    "no-dupe-class-members": ["error"],
    "eqeqeq": ["error", "always"]
  },
  "plugins": [
    "flowtype-errors"
  ]
}