> 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-new-buffer

[Added in v0.9.3](https://github.com/web-infra-dev/rslint/releases/tag/v0.9.3)
## 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-new-buffer': 'error',
    },
  },
]);
```

Enforce `Buffer.from()` and `Buffer.alloc()` instead of the deprecated `new Buffer()` constructor.

## Examples

```js
// Incorrect
const bytes = new Buffer([0x62, 0x75, 0x66]);
const empty = new Buffer(10);

// Correct
const bytes = Buffer.from([0x62, 0x75, 0x66]);
const empty = Buffer.alloc(10);
```

When the argument does not establish whether it is a size or source data, the rule reports a diagnostic with `Buffer.from()` and `Buffer.alloc()` suggestions.

## Further reading

- [Upstream rule documentation](https://github.com/sindresorhus/eslint-plugin-unicorn/blob/v74.0.0/docs/rules/no-new-buffer.md)