# assertSetNotIncludes

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

Assert that a Set does not include a specific member, with type narrowing.

Membership uses the Set's own has(), which is a SameValueZero match, so an object only fails the assertion by being a reference the Set already holds, rather than equivalent in value to a member.

Note that absence has no type-level witness, so this narrows an unknown value to a Set and stops there.

## Usage

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

const value: unknown = new Set(["draft", "featured"]);

assertSetNotIncludes(value, "archived");

// value is now narrowed to ReadonlySet<unknown>
```

## Source

Source file: [`src/assert/set-not-includes/set-not-includes.assert.ts`](https://github.com/KensioSoftware/smartass/blob/main/src/assert/set-not-includes/set-not-includes.assert.ts)