> 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-useless-constructor

[Added in v0.5.0](https://github.com/web-infra-dev/rslint/releases/tag/v0.5.0)
## Configuration


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

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

## Rule Details

Disallow unnecessary constructors.

ES2015 provides a default class constructor if one is not specified. As such, it is unnecessary to provide an empty constructor or one that simply delegates into its parent class.

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

```javascript
class A {
  constructor() {}
}

class B extends A {
  constructor(...args) {
    super(...args);
  }
}
```

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

```javascript
class A {}

class B {
  constructor() {
    doSomething();
  }
}

class C extends A {
  constructor() {
    super('foo');
  }
}

class D extends A {
  constructor() {
    super();
    doSomething();
  }
}
```

## Original Documentation

- [ESLint: no-useless-constructor](https://eslint.org/docs/latest/rules/no-useless-constructor)
- [Source code](https://github.com/eslint/eslint/blob/v10.2.1/lib/rules/no-useless-constructor.js)