1 files changed, 64 insertions, 0 deletions
diff --git a/node_modules/es-abstract/2018/CopyDataProperties.js b/node_modules/es-abstract/2018/CopyDataProperties.js
new file mode 100644
index 000000000..842709903
--- /dev/null
+++ b/node_modules/es-abstract/2018/CopyDataProperties.js
@@ -0,0 +1,64 @@
+'use strict';
+
+var callBound = require('../helpers/callBound');
+var forEach = require('../helpers/forEach');
+var OwnPropertyKeys = require('../helpers/OwnPropertyKeys');
+
+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('./IsPropertyKey');
+var SameValue = require('./SameValue');
+var ToNumber = require('./ToNumber');
+var ToObject = require('./ToObject');
+var Type = require('./Type');
+
+// https://www.ecma-international.org/ecma-262/9.0/#sec-copydataproperties
+
+module.exports = function CopyDataProperties(target, source, excludedItems) {
+	if (Type(target) !== 'Object') {
+		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;
+};