# tap

Pass events downstream only when the tap is open.  `tap()` is evaluated at startup and then every `interval` seconds.

## Config

**Required:**
- `tap`: Function that returns true when the tap is open.

**Optional:**
- `interval`: Re-evaluation interval in seconds (default: 60)

## Example

```yaml
pipeline:
  tap:
    config:
      tap: !!js/function >-
        function() {
          const hour = new Date().getHours()
          return hour >= 9 && hour <= 17
        }
      interval: 300
```