65 lines
1.9 KiB
JavaScript
65 lines
1.9 KiB
JavaScript
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'use strict';
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var callBound = require('../helpers/callBound');
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var forEach = require('../helpers/forEach');
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var OwnPropertyKeys = require('../helpers/OwnPropertyKeys');
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var $isEnumerable = callBound('Object.prototype.propertyIsEnumerable');
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var CreateDataProperty = require('./CreateDataProperty');
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var Get = require('./Get');
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var IsArray = require('./IsArray');
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var IsInteger = require('./IsInteger');
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var IsPropertyKey = require('./IsPropertyKey');
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var SameValue = require('./SameValue');
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var ToNumber = require('./ToNumber');
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var ToObject = require('./ToObject');
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var Type = require('./Type');
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// https://www.ecma-international.org/ecma-262/9.0/#sec-copydataproperties
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module.exports = function CopyDataProperties(target, source, excludedItems) {
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if (Type(target) !== 'Object') {
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throw new TypeError('Assertion failed: "target" must be an Object');
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}
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if (!IsArray(excludedItems)) {
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throw new TypeError('Assertion failed: "excludedItems" must be a List of Property Keys');
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}
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for (var i = 0; i < excludedItems.length; i += 1) {
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if (!IsPropertyKey(excludedItems[i])) {
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throw new TypeError('Assertion failed: "excludedItems" must be a List of Property Keys');
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}
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}
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if (typeof source === 'undefined' || source === null) {
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return target;
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}
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var fromObj = ToObject(source);
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var sourceKeys = OwnPropertyKeys(fromObj);
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forEach(sourceKeys, function (nextKey) {
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var excluded = false;
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forEach(excludedItems, function (e) {
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if (SameValue(e, nextKey) === true) {
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excluded = true;
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}
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});
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var enumerable = $isEnumerable(fromObj, nextKey) || (
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// this is to handle string keys being non-enumerable in older engines
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typeof source === 'string'
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&& nextKey >= 0
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&& IsInteger(ToNumber(nextKey))
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);
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if (excluded === false && enumerable) {
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var propValue = Get(fromObj, nextKey);
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CreateDataProperty(target, nextKey, propValue);
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}
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});
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return target;
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};
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