//use properties for es6 Object.is and Object.mixin monkey-patch
var properties = require('properties');

var is = function (a, b) {
  //code for es6 Object.is shim
};

var mixin = function (target, source) {
  //code for es6 Object.mixin shim
};


properties(Object)
  //use sugar form for is
  .property('is')
    .configurable()
    .writable()
    .enumerable(false)
    .value(is)
    .define()

  //use basic form for mixin
  .property('mixin', {
    configurable: true,
    writable: true,
    enumerable: false,
    value: mixin
  })
;



//or you can use default method
properties(Object)
  //default descriptor
  .default({ writable: true, configurable: true, enumerable: false })

  //sugar form
  .property('is')
    .value(is)
    .define()

  //basic form
  .property('mixin', {
    value: mixin
  })
;