> 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-array-from-fill

[Added in v0.9.2](https://github.com/web-infra-dev/rslint/releases/tag/v0.9.2)
## Configuration

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


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

export default defineConfig([
  unicornPlugin.configs.recommended,
  {
    rules: {
      'unicorn/no-array-from-fill': 'error',
    },
  },
]);
```

## Rule Details

Disallow calling `.fill()` after `Array.from({ length: … })`. Prefer the
mapping function argument of `Array.from()` when creating a fixed-length array
with generated values.

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

```javascript
Array.from({ length: 3 }).fill().map((_, index) => index);
Array.from({ length: 3 }).fill({});
```

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

```javascript
Array.from({ length: 3 }, (_, index) => index);
Array.from({ length: 3 }, () => ({}));
```

Using a mapping function also avoids unintentionally sharing one mutable value
between every array element.

## Original Documentation

- [eslint-plugin-unicorn: no-array-from-fill](https://github.com/sindresorhus/eslint-plugin-unicorn/blob/v74.0.0/docs/rules/no-array-from-fill.md)
- [Source code](https://github.com/sindresorhus/eslint-plugin-unicorn/blob/v74.0.0/rules/no-array-from-fill.js)