es6.reflect.define-property.js

// 26.1.3 Reflect.defineProperty(target, propertyKey, attributes)
var dP          = require('./_object-dp')
  , $export     = require('./_export')
  , anObject    = require('./_an-object')
  , toPrimitive = require('./_to-primitive');

// MS Edge has broken Reflect.defineProperty - throwing instead of returning false
$export($export.S + $export.F * require('./_fails')(function(){
  Reflect.defineProperty(dP.f({}, 1, {value: 1}), 1, {value: 2});
}), 'Reflect', {
  defineProperty: function defineProperty(target, propertyKey, attributes){
    anObject(target);
    propertyKey = toPrimitive(propertyKey, true);
    anObject(attributes);
    try {
      dP.f(target, propertyKey, attributes);
      return true;
    } catch(e){
      return false;
    }
  }
});