$ npm install --save define-property

var define = require('define-property');
var obj = {};
define(obj, 'foo', function(val) {
  return val.toUpperCase();
});

// by default, defined properties are non-enumberable
console.log(obj);
//=> {}

console.log(obj.foo('bar'));
//=> 'BAR'

define(obj, 'foo', {
  set: function() {},
  get: function() {}
});

$ npm install && npm test

$ npm install -g verbose/verb#dev verb-generate-readme && verb