# blackBox

`import { blackBox } from "destack:hint";`

Prevent the optimizer from reasoning through a value.

This is a best-effort optimization barrier and must not be used for correctness or security.

```
const input = blackBox(42);
```

```ds title="blackBox"
export declare function blackBox<T>(value: T): T
```

[language/library/src/hint/hint.ds:9](https://github.com/destack-sh/destack/blob/main/language/library/src/hint/hint.ds#L9)