add cause to AggregateError constructor implementation (still wit…

…hout adding to the feature detection)

CHANGELOG.md

@@ -2,6 +2,7 @@
 ##### Unreleased
 - Fixed `String.prototype.substr` feature detection and compat data
 - Removed mistakenly added `.forEach` from prototypes of some DOM collections where it shouldn't be, [#988](https://github.com/zloirock/core-js/issues/988), [#987](https://github.com/zloirock/core-js/issues/987), thanks [@moorejs](https://github.com/moorejs)
+- Added `cause` to `AggregateError` constructor implementation (still without adding to the feature detection)
 - Families of `.at` and `.findLast` methods marked as supported in Safari TP
 
 ##### 3.18.0 - 2021.09.20

packages/core-js/internals/install-error-cause.js

@@ -0,0 +1,11 @@
+var isObject = require('../internals/is-object');
+var has = require('../internals/has');
+var createNonEnumerableProperty = require('../internals/create-non-enumerable-property');
+
+// `InstallErrorCause` abstract operation
+// https://tc39.es/proposal-error-cause/#sec-errorobjects-install-error-cause
+module.exports = function (O, options) {
+  if (isObject(options) && has(options, 'cause')) {
+    createNonEnumerableProperty(O, 'cause', O.cause);
+  }
+};

packages/core-js/modules/es.aggregate-error.js

@@ -5,17 +5,19 @@ var setPrototypeOf = require('../internals/object-set-prototype-of');
 var create = require('../internals/object-create');
 var createNonEnumerableProperty = require('../internals/create-non-enumerable-property');
 var createPropertyDescriptor = require('../internals/create-property-descriptor');
+var installErrorCause = require('../internals/install-error-cause');
 var iterate = require('../internals/iterate');
 var toString = require('../internals/to-string');
 
-var $AggregateError = function AggregateError(errors, message) {
+var $AggregateError = function AggregateError(errors, message /* , options */) {
   var that = this;
   if (!(that instanceof $AggregateError)) return new $AggregateError(errors, message);
   if (setPrototypeOf) {
     // eslint-disable-next-line unicorn/error-message -- expected
     that = setPrototypeOf(new Error(undefined), getPrototypeOf(that));
   }
   if (message !== undefined) createNonEnumerableProperty(that, 'message', toString(message));
+  if (arguments.length > 2) installErrorCause(that, arguments[2]);
   var errorsArray = [];
   iterate(errors, errorsArray.push, { that: errorsArray });
   createNonEnumerableProperty(that, 'errors', errorsArray);