update validation order of WeakMap.prototype.getOrInsertComputed

tc39/proposal-upsert#79

Author: zloirock

CHANGELOG.md

@@ -1,5 +1,6 @@
 ## Changelog
 ##### Unreleased
+- Validation order of [`WeakMap.prototype.getOrInsertComputed`](https://github.com/tc39/proposal-upsert) updated following [proposal-upsert/79](https://github.com/tc39/proposal-upsert/pull/79) 
 - Compat data improvements:
   - [Explicit Resource Management](https://github.com/tc39/proposal-explicit-resource-management) features disabled (again) in V8 ~ Chromium 135 and re-added in 136
   - [`RegExp.escape`](https://github.com/tc39/proposal-regex-escaping) marked as [shipped from V8 ~ Chromium 136](https://issues.chromium.org/issues/353856236#comment17)

packages/core-js/internals/a-weak-key.js

@@ -0,0 +1,12 @@
+'use strict';
+var WeakMapHelpers = require('../internals/weak-map-helpers');
+
+var weakmap = new WeakMapHelpers.WeakMap();
+var set = WeakMapHelpers.set;
+var remove = WeakMapHelpers.remove;
+
+module.exports = function (key) {
+  set(weakmap, key, 1);
+  remove(weakmap, key);
+  return key;
+};

packages/core-js/modules/esnext.weak-map.get-or-insert-computed.js

@@ -2,6 +2,7 @@
 var $ = require('../internals/export');
 var aCallable = require('../internals/a-callable');
 var aWeakMap = require('../internals/a-weak-map');
+var aWeakKey = require('../internals/a-weak-key');
 var WeakMapHelpers = require('../internals/weak-map-helpers');
 
 var get = WeakMapHelpers.get;
@@ -13,9 +14,9 @@ var set = WeakMapHelpers.set;
 $({ target: 'WeakMap', proto: true, real: true, forced: true }, {
   getOrInsertComputed: function getOrInsertComputed(key, callbackfn) {
     aWeakMap(this);
+    aWeakKey(key);
     aCallable(callbackfn);
     if (has(this, key)) return get(this, key);
-    set(this, key); // key validation
     var value = callbackfn(key);
     set(this, key, value);
     return value;