source: imaps-frontend/node_modules/es-abstract/2018/CopyDataProperties.js@ 79a0317

'use strict';

var $TypeError = require('es-errors/type');

var callBound = require('call-bound');
var forEach = require('../helpers/forEach');
var OwnPropertyKeys = require('own-keys');

var $isEnumerable = callBound('Object.prototype.propertyIsEnumerable');

var CreateDataProperty = require('./CreateDataProperty');
var Get = require('./Get');
var IsArray = require('./IsArray');
var IsInteger = require('./IsInteger');
var isPropertyKey = require('../helpers/isPropertyKey');
var SameValue = require('./SameValue');
var ToNumber = require('./ToNumber');
var ToObject = require('./ToObject');

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

// https://262.ecma-international.org/9.0/#sec-copydataproperties

module.exports = function CopyDataProperties(target, source, excludedItems) {
        if (!isObject(target)) {
                throw new $TypeError('Assertion failed: "target" must be an Object');
        }

        if (!IsArray(excludedItems)) {
                throw new $TypeError('Assertion failed: "excludedItems" must be a List of Property Keys');
        }
        for (var i = 0; i < excludedItems.length; i += 1) {
                if (!isPropertyKey(excludedItems[i])) {
                        throw new $TypeError('Assertion failed: "excludedItems" must be a List of Property Keys');
                }
        }

        if (typeof source === 'undefined' || source === null) {
                return target;
        }

        var fromObj = ToObject(source);

        var sourceKeys = OwnPropertyKeys(fromObj);
        forEach(sourceKeys, function (nextKey) {
                var excluded = false;

                forEach(excludedItems, function (e) {
                        if (SameValue(e, nextKey) === true) {
                                excluded = true;
                        }
                });

                var enumerable = $isEnumerable(fromObj, nextKey) || (
                // this is to handle string keys being non-enumerable in older engines
                        typeof source === 'string'
                        && nextKey >= 0
                        && IsInteger(ToNumber(nextKey))
                );
                if (excluded === false && enumerable) {
                        var propValue = Get(fromObj, nextKey);
                        CreateDataProperty(target, nextKey, propValue);
                }
        });

        return target;
};