Detect node or browser

node-or-browser.js

// determine if in-browser or using node.js

// thruthy
var _nodejs = (
  typeof process !== 'undefined' && process.versions && process.versions.node);
if (_nodejs) {
  _nodejs = {
    version: process.versions.node
  };
}

// truthy
var _browser = !_nodejs &&
  (typeof window !== 'undefined' || typeof self !== 'undefined');
if(_browser) {
  _browser = {
    window: false,
    self: false,
    $: false
  };
  if(typeof global === 'undefined') {
    if(typeof window !== 'undefined') {
      global = window;
      _browser.window = true;
    } else if(typeof self !== 'undefined') {
      global = self;
      _browser.self = true;
    } else if(typeof $ !== 'undefined') {
      global = $;
      _browser.$ = true;
    }
  }
}

if (_nodejs) {
  module.export = {
    nodejs: _nodejs,
    browser: _browser
  };
}

This nice gem is from https://github.com/digitalbazaar/jsonld.js

modified to code to return thruthy false or object with detail - untested