---
title: Publishers.CompactMap.Failure
framework: combine
role: symbol
role_heading: Type Alias
path: combine/publishers/compactmap/failure
---

# Publishers.CompactMap.Failure

The kind of errors this publisher might publish.

## Declaration

```swift
typealias Failure = Upstream.Failure
```

## Discussion

Discussion This publisher produces its upstream publisher’s failure type.

## See Also

### Declaring supporting types

- [Publishers.Output](combine/publishers/output.md)