The .eslintrc I put at the root directory. A little bit flexible to allow for others code that gets checked out, etc.

root-eslintrc.json

{
  "env": {
    "browser": 1,
    "es6": true,
    "amd": true,
    "node": true
  },
  "ecmaFeatures": {
    "arrowFunctions": true,
    "blockBindings": true,
    "classes": true,
    "defaultParams": true,
    "destructuring": true,
    "forOf": true,
    "generators": true,
    "modules": true,
    "objectLiteralComputedProperties": true,
    "objectLiteralShorthandMethods": true,
    "objectLiteralShorthandProperties": true,
    "spread": true,
    "templateStrings": true,
    "unicodeCodePointEscapes": true,
    "jsx": true
  },
  "plugins": [
    "react"
  ],
  "rules": {
    //
    //Possible Errors
    //
    "comma-dangle": 2, // disallow or enforce trailing commas
    "no-dupe-args": 2, // disallow duplicate arguments in functions
    "no-dupe-keys": 2, // disallow duplicate keys when creating object literals
    "no-extra-semi": 2, // disallow unnecessary semicolons
    "no-invalid-regexp": 2, // disallow invalid regular expression strings in the RegExp constructor
    "no-regex-spaces": 2, // disallow multiple spaces in a regular expression literal

    // Best Practices
    //
    "complexity": [1, 4],
    "max-depth": [2, 3],
    "no-extra-bind": 1, // disallow unnecessary function binding
    "default-case": 2, // require default case in switch statements (off by default)
    "dot-notation": 2, // encourages use of dot notation whenever possible
    "eqeqeq": 2, // require the use of === and !==
    "no-alert": 2, // disallow the use of alert, confirm, and prompt
    "no-eval": 2, // disallow use of eval()
    "no-implied-eval": 2, // disallow use of eval()-like methods
    "no-loop-func": 1, // disallow creation of functions within loops
    "no-redeclare": 2, // disallow declaring the same variable more then once
    "no-return-assign": 2, // disallow use of assignment in return statement
    "no-sequences": 2, // disallow use of comma operator
    "no-with": 2, // disallow use of the with statement
    "radix": 2, // require use of the second argument for parseInt() (off by default)
    "wrap-iife": [2, "inside"], // require immediate function invocation to be wrapped in parentheses (off by default)
    "yoda": 2, // require or disallow Yoda conditions

    // Variables
    //
    "no-delete-var": 2, // disallow deletion of variables
    "no-undef": 2, // disallow use of undeclared variables unless mentioned in a /*global */ block


    // Style
    //
    "camelcase": 1,
    "indent": [1, "tab"],
    "comma-spacing": [1, {"before": false, "after": true}], // enforce spacing before and after comma
    "comma-style": [1, "last"],
    "consistent-this": [1, "self"], // enforces consistent naming when capturing the current execution context (off by default)
    "eol-last": 1, // enforce newline at the end of file, with no multiple empty lines
    "key-spacing": [1, {"beforeColon": false, "afterColon": true}], // enforces spacing between keys and values in object literal properties
    "new-parens": 1, // disallow the omission of parentheses when invoking a constructor with no arguments
    "no-lonely-if": 1, // disallow if as the only statement in an else block (off by default)
    "no-nested-ternary": 1, // disallow nested ternary expressions (off by default)
    "no-spaced-func": 1, // disallow space between function identifier and application
    "no-trailing-spaces": [1, { skipBlankLines: true }], // disallow trailing whitespace at the end of lines
    "no-underscore-dangle": 1, // disallow dangling underscores in identifiers
    "operator-assignment": [2, "always"],
    "operator-linebreak": [2, "after"],
    "quote-props": [1, "as-needed"], // require quotes around object literal property names (off by default)
    "quotes": [2, "single"],
    "semi": [1, "always"], // require or disallow use of semicolons instead of ASI
    "semi-spacing": [2, {"before": false, "after": true}],
    "space-infix-ops": 1, // require spaces around operators
    "space-return-throw-case": 1, // require a space after return, throw, and case
    "space-unary-ops": [1, {"words": true, "nonwords": false}], // Require or disallow spaces before/after unary operators (words on by default, nonwords off by default)
    "wrap-regex": 2,


    "react/jsx-boolean-value": 1,
    "react/jsx-no-undef": 1,
    "react/jsx-quotes": [2, "double", "avoid-escape"], // Enforce quote style for JSX attributes
    "react/jsx-uses-react": 1,
    "react/jsx-uses-vars": 1,
    "react/no-did-mount-set-state": 1,
    "react/no-did-update-set-state": 1,
    "react/no-multi-comp": 1,
    "react/no-unknown-property": 1,
    "react/prop-types": 1,
    "react/react-in-jsx-scope": 1,
    "react/self-closing-comp": 1,
    "react/wrap-multilines": 1
  }
}