# WorkerdBackgroundTaskProvider

## Import

```typescript
import { WorkerdBackgroundTaskProvider } from "alepha/background";
```

## Overview

Cloudflare Workers variant of `BackgroundTaskProvider`.

Cloudflare freezes the isolate once the response is returned, so a plain
fire-and-forget promise would be killed mid-flight. The platform exposes a
per-request `executionCtx.waitUntil(promise)` that keeps the isolate alive
until `promise` settles; the request entry point (generated by the Cloudflare
build) stashes it in the Alepha store under `cloudflare.waitUntil`.

This is the ONE place that reads that key - call sites use
`BackgroundTaskProvider.defer` and stay platform-agnostic.

`waitUntil` is request-scoped, so `defer()` must be called within the
request's async context (which is where background work is scheduled). Outside
a request (e.g. a cron tick) the key is absent and we fall back to the base
fire-and-track behaviour.