# isPending

Tests whether the base state is loading or refreshing through optimistic history.

## Signatures

```ts
export declare const isPending: <A, E>(asyncData: AsyncData<A, E>) => asyncData is Loading | Refreshing<A, E>;
```

## Why

Pending status follows the underlying operation rather than disappearing when optimistic values are layered above it; cycles return `false`.

**Known type/runtime discrepancy:** an `Optimistic` wrapper over a pending base returns `true` at runtime, but the existing type predicate narrows to `Loading | Refreshing<A, E>` and excludes `Optimistic`. Do not use this function to narrow before reading `_tag`; use it only as a pending-status boolean and refine the original value separately. The predicate is retained for compatibility and is not an accurate description of every `true` result.

## Ownership and lifetime

This iterative predicate acquires no resources and retains no visited objects after returning.

## Examples

```ts
import { isPending, loading, optimistic } from "@typed/async-data"
isPending(optimistic(loading(), "draft"))
```