IsDataDescriptor.js

'use strict';

var has = require('has');

var assertRecord = require('../helpers/assertRecord');

var Type = require('./Type');

// https://www.ecma-international.org/ecma-262/6.0/#sec-isdatadescriptor

module.exports = function IsDataDescriptor(Desc) {
	if (typeof Desc === 'undefined') {
		return false;
	}

	assertRecord(Type, 'Property Descriptor', 'Desc', Desc);

	if (!has(Desc, '[[Value]]') && !has(Desc, '[[Writable]]')) {
		return false;
	}

	return true;
};