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# no-extra-bind

[Added in v0.3.4](https://github.com/web-infra-dev/rslint/releases/tag/v0.3.4)
## Configuration


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

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

## Rule Details

Disallows unnecessary calls to `.bind()`. If a function expression does not use `this`, calling `.bind()` on it is unnecessary. Arrow functions never have their own `this` binding, so `.bind()` on an arrow function is always unnecessary.

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

```javascript
var x = function () {
  foo();
}.bind(bar);

var x = (() => {
  foo();
}).bind(bar);

var x = function () {
  (function () {
    this.bar();
  })();
}.bind(baz);
```

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

```javascript
var x = function () {
  this.foo();
}.bind(bar);

var x = function (a) {
  return a + 1;
}.bind(foo, bar);

var x = f.bind(bar);
```

## Original Documentation

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