add types for Object.keysLength

Author: zloirock

packages/core-js-types/src/base/proposals/object-keys-length.d.ts

@@ -0,0 +1,9 @@
+// https://github.com/tc39/proposal-object-keys-length
+
+interface ObjectConstructor {
+  /**
+   * Returns the number of enumerable own properties of an object
+   * @param o - Object that contains the properties and methods. This can be an object that you created or an existing Document Object Model (DOM) object.
+   */
+  keysLength(o: {}): number;
+}

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

@@ -1,3 +1,4 @@
+// @types: proposals/object-keys-length
 'use strict';
 var $ = require('../internals/export');
 var getBuiltInStaticMethod = require('../internals/get-built-in-static-method');

tests/type-definitions/global/proposals/object-keys-length.test.ts

@@ -0,0 +1,34 @@
+import 'core-js/full';
+import keysLength from 'core-js/full/object/keys-length';
+import { assertNumber } from '../../helpers';
+
+const obj = { a: 1, b: 2 };
+const arr = [1, 2, 3];
+const strArr = ['a', 'b', 'c'];
+const arrLike: ArrayLike<number> = { 0: 10, 1: 20, length: 2 };
+const emptyObj = {};
+const string = 'abc';
+
+assertNumber(keysLength(obj));
+assertNumber(keysLength(arr));
+assertNumber(keysLength(strArr));
+assertNumber(keysLength(arrLike));
+assertNumber(keysLength(emptyObj));
+assertNumber(keysLength(string));
+
+assertNumber(Object.keysLength(obj));
+assertNumber(Object.keysLength(arr));
+assertNumber(Object.keysLength(strArr));
+assertNumber(Object.keysLength(arrLike));
+assertNumber(Object.keysLength(emptyObj));
+assertNumber(Object.keysLength(string));
+
+// @ts-expect-error
+keysLength();
+// @ts-expect-error
+keysLength(null);
+
+// @ts-expect-error
+Object.keysLength();
+// @ts-expect-error
+Object.keysLength(null);

tests/type-definitions/pure/proposals/object-keys-length.test.ts

@@ -0,0 +1,21 @@
+import keysLength from '@core-js/pure/full/object/keys-length';
+import { assertNumber } from '../../helpers';
+
+const obj = { a: 1, b: 2 };
+const arr = [1, 2, 3];
+const strArr = ['a', 'b', 'c'];
+const arrLike: ArrayLike<number> = { 0: 10, 1: 20, length: 2 };
+const emptyObj = {};
+const string = 'abc';
+
+assertNumber(keysLength(obj));
+assertNumber(keysLength(arr));
+assertNumber(keysLength(strArr));
+assertNumber(keysLength(arrLike));
+assertNumber(keysLength(emptyObj));
+assertNumber(keysLength(string));
+
+// @ts-expect-error
+keysLength();
+// @ts-expect-error
+keysLength(null);