---
title: upstream
framework: combine
role: symbol
role_heading: Instance Property
path: combine/publishers/throttle/upstream
---

# upstream

The publisher from which this publisher receives elements.

## Declaration

```swift
let upstream: Upstream
```

## See Also

### Inspecting publisher properties

- [interval](combine/publishers/throttle/interval.md)
- [scheduler](combine/publishers/throttle/scheduler.md)
- [latest](combine/publishers/throttle/latest.md)