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# no-implied-eval

[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-implied-eval': 'error',
    },
  },
]);
```

## Rule Details

Disallow the use of `eval()`-like methods.

Passing a string as the first argument to `setTimeout`, `setInterval`, or `execScript` causes the string to be evaluated as JavaScript — a form of implied `eval()`. This rule flags such calls, whether made directly or through a global object reference (`window`, `global`, `globalThis`, or `self`).

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

```javascript
setTimeout('alert(\'Hi!\');', 100);
setInterval('alert(\'Hi!\');', 100);
execScript('alert(\'Hi!\')');

window.setTimeout('count = 5', 10);
window.setInterval('foo = bar', 10);

globalThis.setTimeout(`code ${foo}`);
self.setInterval('foo' + bar);
```

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

```javascript
setTimeout(function () {
  alert('Hi!');
}, 100);

setInterval(function () {
  alert('Hi!');
}, 100);

execScript(function () {
  alert('Hi!');
});

const handler = () => alert('Hi!');
setTimeout(handler, 100);
window.setTimeout(handler, 100);
```

## Original Documentation

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