# assertStringIncludes

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

Assert that a string includes a given substring, with type narrowing.

## Usage

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

const message: string = "Upload success";

assertStringIncludes(message, "success");

// message is now narrowed to a string including "success"
```

## Source

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