> ## Documentation Index
> Fetch the complete documentation index at: https://docs.seam.co/llms.txt
> Use this file to discover all available pages before exploring further.

# Extensions

> Public extensions on String and PKAutomaticPassPresentationSuppressionResult provided by SeamSDK.

> **Interim hand-authored reference.** This page is authored from the SeamSDK public Swift sources. See the [reference overview](/mobile-sdks/ios/reference) for context.

## Overview

SeamSDK adds two public extensions to types outside the SDK's own namespace. Both are minor utility conformances.

***

## `extension String`

```swift theme={null}
extension String: @retroactive Error { }
```

Conforms `String` to `Error` retroactively. This allows string literals to be used as throwable error values in SDK-internal bridging code. It is a low-level utility conformance with no public API surface beyond what `Error` already provides.

***

## `extension PKAutomaticPassPresentationSuppressionResult`

Defined in `PassKit`. SeamSDK adds a `CustomStringConvertible` conformance so that suppression result values produce human-readable descriptions in logs.

```swift theme={null}
extension PKAutomaticPassPresentationSuppressionResult: @retroactive CustomStringConvertible {
    public var description: String { get }
}
```

### `description`

Returns a human-readable name for the suppression result.

| Value                | `description`           |
| -------------------- | ----------------------- |
| `.notSupported`      | `"NotSupported"`        |
| `.alreadyPresenting` | `"AlreadyPresenting"`   |
| `.denied`            | `"Denied"`              |
| `.cancelled`         | `"Cancelled"`           |
| `.success`           | `"Success"`             |
| unknown future cases | `"Unknown(<rawValue>)"` |

This conformance is used internally by SeamSDK to log Apple Wallet pass-suppression state during unlock operations. You do not need to interact with it directly.