.eslintrc.js

module.exports = {
  extends: 'google',
  parserOptions: {
    'ecmaVersion': 6
  },
  rules: {
    // don't dangle commas
    'comma-dangle': ['error', 'never'],
    // pre-ES6 engines need to be able to use objects as maps
    'guard-for-in': 'off',
    // increase max line length
    'max-len': ['error', {'code': 120}],
    // This is silly. Negated conditions are highly useful and often much more concise than
    // their complements.
    'no-negated-condition': 'off',
    // allow use of var
    'no-var': 'off',
    'indent': ['error', 2, {
      'MemberExpression': 1
    }]
  }
};