.eslintrc.js

module.exports = {
  extends: 'eslint:recommended',
  'env': {
    'browser': false,
    'node': true,
    'jest': true,
    'es6': true
  },
  // add global vars for chai, etc
  'globals': {
    'expect': false,
    'chai': false,
    'sinon': false
  },
  'rules': {
    // possible errors
    'no-extra-parens': 1,
    'valid-jsdoc': [1, {
      'requireReturn': false,
      'requireParamDescription': false,
      'requireReturnDescription': false
    }],
    // best practices
    'complexity': [2, 8],
    'default-case': 2,
    'guard-for-in': 0,
    'no-alert': 1,
    'no-floating-decimal': 1,
    'no-self-compare': 2,
    'no-throw-literal': 2,
    'no-void': 2,
    'quote-props': [2, 'as-needed'],
    'vars-on-top': 2,
    'wrap-iife': 2,
    // strict mode
    'strict': [2, 'global'],
    // variables
    'no-unused-vars': 2,
    // node.js
    'handle-callback-err': [2, '^.*(e|E)rr'],
    'no-mixed-requires': 0,
    'no-new-require': 2,
    'no-path-concat': 2,
    // stylistic issues
    'brace-style': [2, '1tbs', { 'allowSingleLine': true }],
    'comma-style': [2, 'last'],
    'indent': [2, 2, { 'SwitchCase': 1 }],
    'max-nested-callbacks': [2, 4],
    'newline-after-var': [2, 'always'],
    'no-nested-ternary': 2,
    'no-spaced-func': 0,
    'no-trailing-spaces': 2,
    'no-underscore-dangle': 0,
    'no-unneeded-ternary': 1,
    'one-var': 2,
    'quotes': [2, 'single', 'avoid-escape'],
    'semi': [2, 'always'],
    'keyword-spacing': 2,
    'space-before-blocks': [2, 'always'],
    'space-before-function-paren': [2, {'anonymous': 'always', 'named': 'never'}],
    'space-infix-ops': [1, {'int32Hint': false}],
    'spaced-comment': [2, 'always'],
    // es6
    'generator-star-spacing': [2, 'before'],
    // legacy jshint rules
    'max-depth': [2, 4],
    'max-params': [2, 4],
    'no-console': 0,
  }
};