> 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-class-assign

[Added in v0.1.14](https://github.com/web-infra-dev/rslint/releases/tag/v0.1.14)
## Configuration

| Preset                   | Configured Value |
| ------------------------ | ---------------- |
| ✅ js.configs.recommended | `"error"`        |


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

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

## Rule Details

Disallows reassigning variables that were declared as class declarations. Reassigning a class declaration is almost always a mistake, as it overwrites the class with a different value. This rule checks for assignments, increment/decrement operations, and destructuring assignments that target a class name.

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

```javascript
class A {}
A = 0;

class B {}
B += 1;

class C {}
({ C } = obj);
```

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

```javascript
class A {}
var a = new A();

let B = class {};
B = 0; // B is a variable, not a class declaration

class C {}
function fn(C) {
  C = 0; // C is a parameter, not the class
}
```

## Original Documentation

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