---
title: ts-extras type-guards preset
---

# ✴️ type-guards

Use when you want only guard/assertion-focused ts-extras rules.

## Config key

```ts
typefest.configs["ts-extras/type-guards"];
```

## Flat Config example

```ts
import typefest from "eslint-plugin-typefest";

export default [typefest.configs["ts-extras/type-guards"]];
```

## Rules in this preset

- `Fix` legend:
  - `🔧` = autofixable
  - `💡` = suggestions available
  - `—` = report only

| Rule                                                                                                                                          |  Fix  |
| --------------------------------------------------------------------------------------------------------------------------------------------- | :---: |
| [`prefer-ts-extras-array-includes`](https://nick2bad4u.github.io/eslint-plugin-typefest/docs/rules/prefer-ts-extras-array-includes)           | 🔧 💡 |
| [`prefer-ts-extras-assert-defined`](https://nick2bad4u.github.io/eslint-plugin-typefest/docs/rules/prefer-ts-extras-assert-defined)           | 🔧 💡 |
| [`prefer-ts-extras-assert-error`](https://nick2bad4u.github.io/eslint-plugin-typefest/docs/rules/prefer-ts-extras-assert-error)               |  💡   |
| [`prefer-ts-extras-assert-never`](https://nick2bad4u.github.io/eslint-plugin-typefest/docs/rules/prefer-ts-extras-assert-never)               |  💡   |
| [`prefer-ts-extras-assert-present`](https://nick2bad4u.github.io/eslint-plugin-typefest/docs/rules/prefer-ts-extras-assert-present)           | 🔧 💡 |
| [`prefer-ts-extras-is-defined`](https://nick2bad4u.github.io/eslint-plugin-typefest/docs/rules/prefer-ts-extras-is-defined)                   |  🔧   |
| [`prefer-ts-extras-is-defined-filter`](https://nick2bad4u.github.io/eslint-plugin-typefest/docs/rules/prefer-ts-extras-is-defined-filter)     |  🔧   |
| [`prefer-ts-extras-is-empty`](https://nick2bad4u.github.io/eslint-plugin-typefest/docs/rules/prefer-ts-extras-is-empty)                       |  🔧   |
| [`prefer-ts-extras-is-finite`](https://nick2bad4u.github.io/eslint-plugin-typefest/docs/rules/prefer-ts-extras-is-finite)                     |  🔧   |
| [`prefer-ts-extras-is-infinite`](https://nick2bad4u.github.io/eslint-plugin-typefest/docs/rules/prefer-ts-extras-is-infinite)                 |  🔧   |
| [`prefer-ts-extras-is-integer`](https://nick2bad4u.github.io/eslint-plugin-typefest/docs/rules/prefer-ts-extras-is-integer)                   |  🔧   |
| [`prefer-ts-extras-is-present`](https://nick2bad4u.github.io/eslint-plugin-typefest/docs/rules/prefer-ts-extras-is-present)                   |  🔧   |
| [`prefer-ts-extras-is-present-filter`](https://nick2bad4u.github.io/eslint-plugin-typefest/docs/rules/prefer-ts-extras-is-present-filter)     |  🔧   |
| [`prefer-ts-extras-is-property-defined`](https://nick2bad4u.github.io/eslint-plugin-typefest/docs/rules/prefer-ts-extras-is-property-defined) |  🔧   |
| [`prefer-ts-extras-is-property-present`](https://nick2bad4u.github.io/eslint-plugin-typefest/docs/rules/prefer-ts-extras-is-property-present) |  🔧   |
| [`prefer-ts-extras-is-safe-integer`](https://nick2bad4u.github.io/eslint-plugin-typefest/docs/rules/prefer-ts-extras-is-safe-integer)         |  🔧   |
| [`prefer-ts-extras-key-in`](https://nick2bad4u.github.io/eslint-plugin-typefest/docs/rules/prefer-ts-extras-key-in)                           |  🔧   |
| [`prefer-ts-extras-not`](https://nick2bad4u.github.io/eslint-plugin-typefest/docs/rules/prefer-ts-extras-not)                                 |  🔧   |
| [`prefer-ts-extras-object-has-in`](https://nick2bad4u.github.io/eslint-plugin-typefest/docs/rules/prefer-ts-extras-object-has-in)             | 🔧 💡 |
| [`prefer-ts-extras-object-has-own`](https://nick2bad4u.github.io/eslint-plugin-typefest/docs/rules/prefer-ts-extras-object-has-own)           | 🔧 💡 |
| [`prefer-ts-extras-safe-cast-to`](https://nick2bad4u.github.io/eslint-plugin-typefest/docs/rules/prefer-ts-extras-safe-cast-to)               |  🔧   |
| [`prefer-ts-extras-set-has`](https://nick2bad4u.github.io/eslint-plugin-typefest/docs/rules/prefer-ts-extras-set-has)                         | 🔧 💡 |