---
url: /docs/guide/usage/linter/rules/vitest/prefer-to-be-truthy.md
---

### What it does

This rule warns when `toBe(true)` is used with `expect` or `expectTypeOf`.
With `--fix-suggestions`, it will be replaced with `toBeTruthy()`.

### Why is this bad?

When testing for truthiness, `toBeTruthy()` expresses that intent directly.
Unlike `toBe(true)`, it also accepts non-boolean truthy values such as
non-empty strings and objects. The replacement is a suggestion because
it changes which values pass the assertion.

### Examples

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

```javascript
expect(foo).toBe(true);
expectTypeOf(foo).toBe(true);
```

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

```javascript
expect(foo).toBeTruthy();
expectTypeOf(foo).toBeTruthy();
```

## How to use

## Version

This rule was added in v0.7.1.

## References