# notDeepEqual

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

Assert that `actual` does not deeply equal `expected`.

```ds title="notDeepEqual"
export function notDeepEqual<T, U>(actual: T, expected: U, message?: string | undefined): void
```

[language/library/src/assert/assert.ds:73:75](https://github.com/destack-sh/destack/blob/main/language/library/src/assert/assert.ds#L73-L75)