.jshintrc

{
  "curly": true,        // true: Require {} for every new block or scope
  "immed": true,        // true: Require immediate invocations to be wrapped in parens e.g. `(function () { } ());`
  "indent": 4,          // {int} Number of spaces to use for indentation
  "latedef": false,      // true: Require variables/functions to be defined before being used
  "newcap": true,       // true: Require capitalization of all constructor functions e.g. `new F()`
  "noarg": true,        // true: Prohibit use of `arguments.caller` and `arguments.callee`
  "quotmark": false,     // Quotation mark consistency:
                        //   false    : do nothing (default)
                        //   true     : ensure whatever is used is consistent
                        //   "single" : require single quotes
                        //   "double" : require double quotes
  "sub": true,          // true: Tolerate using `[]` notation when it can still be expressed in dot notation
  "undef": true,        // true: Require all non-global variables to be declared (prevents global leaks)
  "unused": false,       // true: Require all defined variables be used
  "boss": true,         // true: Tolerate assignments where comparisons would be expected
  "eqnull": false,       // true: Tolerate use of `== null`
  "browser": true,      // Web Browser (window, document, etc)
  "es5": false,          // true: Allow ES5 syntax (ex: getters and setters)
  "predef": ["console", "alert"],
  "globals": { // Globals variables.
    "react": true,
    "require": true,
    "module": true,
    "_":false,
    "$":true,
    "process":true,
    "global":true,
    "__dirname": true,
    "describe": true,
    "beforeEach": true,
    "expect": true,
    "it": true,
    "jest": true,
    "jasmine": true,
    "spyOn": true
  }
}