1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
/** * Determines whether an object has a property with the specified name. * Avoid calling prototype builtin `hasOwnProperty` for two reasons: * * 1. `hasOwnProperty` is defined on the object as something else: * *      const options = { *        ending: 'utf8', *        hasOwnProperty: 'foo' *      }; *      options.hasOwnProperty('ending') // throws a TypeError * * 2. The object doesn't inherit from `Object.prototype`: * *       const options = Object.create(null); *       options.ending = 'utf8'; *       options.hasOwnProperty('ending'); // throws a TypeError * * @param obj A Object. * @param v A property name. * @see https://eslint.org/docs/rules/no-prototype-builtins */export function hasOwnProperty<T>(obj: T, v: PropertyKey): boolean {  if (obj == null) {    return false;  }  return Object.prototype.hasOwnProperty.call(obj, v);}