es.reflect.define-property.js 1.6 KB

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  1. 'use strict';
  2. var $ = require('../internals/export');
  3. var DESCRIPTORS = require('../internals/descriptors');
  4. var anObject = require('../internals/an-object');
  5. var toPropertyKey = require('../internals/to-property-key');
  6. var definePropertyModule = require('../internals/object-define-property');
  7. var isCallable = require('../internals/is-callable');
  8. var fails = require('../internals/fails');
  9. var $TypeError = TypeError;
  10. // MS Edge has broken Reflect.defineProperty - throwing instead of returning false
  11. var ERROR_INSTEAD_OF_FALSE = fails(function () {
  12. // eslint-disable-next-line es/no-reflect -- required for testing
  13. Reflect.defineProperty(definePropertyModule.f({}, 1, { value: 1 }), 1, { value: 2 });
  14. });
  15. // `Reflect.defineProperty` method
  16. // https://tc39.es/ecma262/#sec-reflect.defineproperty
  17. $({ target: 'Reflect', stat: true, forced: ERROR_INSTEAD_OF_FALSE, sham: !DESCRIPTORS }, {
  18. defineProperty: function defineProperty(target, propertyKey, attributes) {
  19. anObject(target);
  20. var key = toPropertyKey(propertyKey);
  21. var get, set;
  22. anObject(attributes);
  23. // propagate `ToPropertyDescriptor` errors instead of catching them
  24. if (('get' in attributes || 'set' in attributes) && (
  25. ('get' in attributes && !isCallable(get = attributes.get) && get !== undefined) ||
  26. ('set' in attributes && !isCallable(set = attributes.set) && set !== undefined) ||
  27. ('value' in attributes || 'writable' in attributes)
  28. )) throw new $TypeError('Invalid property descriptor');
  29. try {
  30. definePropertyModule.f(target, key, attributes);
  31. return true;
  32. } catch (error) {
  33. return false;
  34. }
  35. }
  36. });