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

# isEndstateError

> True for any error this package threw. Use it to log requestId.

```ts theme={null}
isEndstateError(value: unknown): value is EndstateError
isEndstateError<C extends ErrorCode>(value: unknown, ...codes: C[]): value is EndstateApiError & {
```

## Example

```ts theme={null}
if (isEndstateError(error, "chip.already_scanned")) askForFreshTap();
```