Object.keysLength stage 2 proposal

Author: slowcheetah

CHANGELOG.md

@@ -3,6 +3,7 @@
 - Improved performance of `atob` and `btoa`, [#1503](https://github.com/zloirock/core-js/issues/1503), [#1464](https://github.com/zloirock/core-js/issues/1464)
 - Forced replacement of `Iterator.{ concat, zip, zipKeyed }` in the pure version for ensuring proper wrapped `Iterator` instances as the result
 - Fixed a minor logical bug in the debugging output of `core-js-builder`
+- Added `Object.keysLength` stage 2 proposal
 - Compat data improvements:
   - [`Iterator.concat`](https://github.com/tc39/proposal-iterator-sequencing) marked as [shipped in V8 ~ Chrome 146](https://issues.chromium.org/issues/434977727#comment7)
   - Added [Deno 2.6.7](https://github.com/denoland/deno/releases/tag/v2.6.7) compat data mapping

README.md

@@ -183,6 +183,7 @@ structuredClone(new Set([1, 2, 3])); // => new Set([1, 2, 3])
       - [`String.dedent`](#stringdedent)
       - [`Symbol` predicates](#symbol-predicates)
       - [`Symbol.customMatcher` for extractors](#symbolcustommatcher-for-extractors)
+      - [`Object.keysLength`](#object-keyslength)
     - [Stage 1 proposals](#stage-1-proposals)
       - [`Observable`](#observable)
       - [New collections methods](#new-collections-methods)
@@ -3091,6 +3092,23 @@ core-js/proposals/pattern-extractors
 core-js(-pure)/full/symbol/custom-matcher
 ```
 
+##### [`Object.keysLength`](https://github.com/tc39/proposal-object-keys-length)[⬆](#index)
+Module [`esnext.object.keys-length`](https://github.com/zloirock/core-js/blob/master/packages/core-js/modules/esnext.object.keys-length.js).
+```ts
+class Object {
+  static keysLength(obj: Object): number;
+}
+```
+[*CommonJS entry points:*](#commonjs-api)
+```
+core-js/proposals/object-keys-length
+core-js(-pure)/full/object/keys-length
+```
+*Examples*:
+```js
+Object.keysLength({ a: 1, b: 2 }); // => 2
+```
+
 #### Stage 1 proposals[⬆](#index)
 [*CommonJS entry points:*](#commonjs-api)
 ```

docs/web/docs/features/proposals/object-keys-length.md

@@ -0,0 +1,21 @@
+# Object.keysLength
+[Specification](https://tc39.es/proposal-object-keys-length/)\
+[Proposal repo](https://github.com/tc39/proposal-object-keys-length)
+
+## Built-ins signatures
+```ts
+class Object {
+  static keysLength(obj: Object): number;
+}
+```
+
+## [Entry points]({docs-version}/docs/usage#h-entry-points)
+```plaintext
+core-js/proposals/object-keys-length
+core-js(-pure)/full/object/keys-length
+```
+
+## Examples
+```js
+Object.keysLength({ a: 1, b: 2 }); // => 2
+```

docs/web/docs/menu.json

@@ -299,6 +299,10 @@
               {
                 "title": "Symbol.customMatcher for extractors",
                 "url": "{docs-version}/docs/features/proposals/symbol-custommatcher-for-extractors"
+              },
+              {
+                "title": "Object.keysLength",
+                "url": "{docs-version}/docs/features/proposals/object-keys-length"
               }
             ]
           },

packages/core-js-compat/src/data.mjs

@@ -2743,6 +2743,8 @@ export const data = {
   },
   // TODO: Remove from `core-js@4`
   'esnext.object.has-own': null,
+  'esnext.object.keys-length': {
+  },
   // TODO: Remove from `core-js@4`
   'esnext.object.iterate-entries': {
   },

packages/core-js-compat/src/modules-by-versions.mjs

@@ -323,4 +323,7 @@ export default {
     'es.weak-map.get-or-insert',
     'es.weak-map.get-or-insert-computed',
   ],
+  3.49: [
+    'esnext.object.keys-length',
+  ],
 };

packages/core-js/full/object/index.js

@@ -5,5 +5,6 @@ require('../../modules/esnext.object.has-own');
 require('../../modules/esnext.object.iterate-entries');
 require('../../modules/esnext.object.iterate-keys');
 require('../../modules/esnext.object.iterate-values');
+require('../../modules/esnext.object.keys-length');
 
 module.exports = parent;

packages/core-js/full/object/keys-length.js

@@ -0,0 +1,6 @@
+'use strict';
+require('../../modules/esnext.object.keys-length');
+
+var entryUnbind = require('../../internals/entry-unbind');
+
+module.exports = entryUnbind('Object', 'keysLength');

packages/core-js/modules/esnext.object.keys-length.js

@@ -0,0 +1,17 @@
+'use strict';
+var $ = require('../internals/export');
+var getBuiltIn = require('../internals/get-built-in');
+var lengthOfArrayLike = require('../internals/length-of-array-like');
+var toObject = require('../internals/to-object');
+
+var enumerableOwnProperties = getBuiltIn('Object', 'keys');
+
+// `Object.keysLength` method
+// https://github.com/tc39/proposal-object-keys-length
+$({ target: 'Object', stat: true, forced: true }, {
+  keysLength: function keysLength(O) {
+    var obj = toObject(O);
+    var keyList = enumerableOwnProperties(obj);
+    return lengthOfArrayLike(keyList);
+  }
+});

packages/core-js/proposals/object-keys-length.js

@@ -0,0 +1,3 @@
+'use strict';
+// https://github.com/tc39/proposal-object-keys-length
+require('../modules/esnext.object.keys-length');