# assertThrowsErrorAsync

Source: https://smartassertions.dev/assertions/assertThrowsErrorAsync/
Index of every page: https://smartassertions.dev/llms.txt

Assertion function that verifies an async function throws an error.

Returns the thrown error for further assertions.

## Usage

```ts
import { assertThrowsErrorAsync } from "@kensio/smartass";

const error = await assertThrowsErrorAsync(async () => loadUser("missing"));

// error is returned as Error; this assertion does not narrow another value.
```

## Source

Source file: [`src/assert/throws-error-async/throws-error-async.assert.ts`](https://github.com/KensioSoftware/smartass/blob/main/src/assert/throws-error-async/throws-error-async.assert.ts)