support.js

/** Used to detect DOM support. */
var document = (document = global.window) ? document.document : null;

/**
 * An object environment feature flags.
 *
 * @static
 * @memberOf _
 * @type Object
 */
var support = {};

(function(x) {
  var Ctor = function() { this.x = x; },
      object = { '0': x, 'length': x },
      props = [];

  Ctor.prototype = { 'valueOf': x, 'y': x };
  for (var key in new Ctor) { props.push(key); }

  /**
   * Detect if the DOM is supported.
   *
   * @memberOf _.support
   * @type boolean
   */
  try {
    support.dom = document.createDocumentFragment().nodeType === 11;
  } catch(e) {
    support.dom = false;
  }
}(1, 0));

module.exports = support;