Function peek

peek<V>(consumer: (item: V) => unknown): Task<V>
Creates a task observing the feed without altering it.

Every item is handed to the consumer before being emitted unchanged, making the feed observable at any point of a pipe for tracing, logging or metering purposes.
Type Parameters
- V
  The type of items in the feed
Parameters
- consumer: (item: V) => unknown
  The function observing each item; a returned promise is awaited before the item moves on, so asynchronous side effects hold the feed back until they complete
Returns Task<V>
A task yielding the items of the feed unchanged
Example
```
await pipe(
  (items(1, 2, 3))
  (peek(n => console.log(n)))
  (toArray())
);  // logs 1, 2, 3; [1, 2, 3]
```
- Defined in tasks/peek.ts:43