> For AI agents: the complete documentation index is available at https://rslint.rs/llms.txt, the full documentation bundle is available at https://rslint.rs/llms-full.txt.

# no-proto

[Added in v0.4.2](https://github.com/web-infra-dev/rslint/releases/tag/v0.4.2)
## Configuration


```ts title=rslint.config.ts
import { defineConfig, js } from '@rslint/core';

export default defineConfig([
  js.configs.recommended,
  {
    rules: {
      'no-proto': 'error',
    },
  },
]);
```

## Rule Details

Disallow the use of the `__proto__` property.

When an object is created with the `new` operator, `__proto__` is set to the original "prototype" property of the object's constructor function. `Object.getPrototypeOf` is the preferred method of getting the object's prototype. To change an object's prototype, use `Object.setPrototypeOf`.

Examples of **incorrect** code for this rule:

```javascript
var a = obj.__proto__;

var a = obj['__proto__'];

obj.__proto__ = b;

obj['__proto__'] = b;
```

Examples of **correct** code for this rule:

```javascript
var a = Object.getPrototypeOf(obj);

Object.setPrototypeOf(obj, b);

var c = { __proto__: a };
```

## Original Documentation

- [ESLint: no-proto](https://eslint.org/docs/latest/rules/no-proto)
- [Source code](https://github.com/eslint/eslint/blob/v10.8.1/lib/rules/no-proto.js)