# $scope

## Import

```typescript
import { $scope } from "alepha";
```

## Overview

Middleware that wraps the handler in an ALS (AsyncLocalStorage) context.

Gives the handler its own isolated scope - `alepha.context.get()` / `.set()` are scoped
to this execution. Useful for `$pipeline` where no host primitive provides a scope.

Host primitives (`$action`, `$job`, `$page`) include `$scope` by default.
Adding `$scope()` to their `use` array will throw - you're already in a scope.

```typescript
class OrderService {
  processOrder = $pipeline({
    use: [$scope()],
    handler: async (orderId: string) => {
      // alepha.context.set/get are scoped here
      return await this.orders.updateById(orderId, { status: "paid" });
    },
  });
}
```