# assert

`import { assert } from "destack:console";`

Write an assertion failure when `condition` is false.

```ds title="assert"
export function assert(condition: boolean, ...values: unknown[]): Result<void, HostError>
```

[language/library/src/console/console.ds:132:134](https://github.com/destack-sh/destack/blob/main/language/library/src/console/console.ds#L132-L134)