# Reflect.3. Keeping scopes separate — Mercury LMS

> Contract: `@fiberfx/reflect` 4.1.1; Hypergraph and Hyperscript 4.1.1.

## Contract

Use the existing `Provider` from @fiberfx/hypergraph/hyperscript. Reflect owns neither scope creation nor disposal. setScopeMode("required") refuses a missing Provider in the shared binding. Unmount before disposing owned scopes.

## Isolation

One model, two fork() scopes. Bind callbacks through Reflect. Left 2, right 1; scoped left reset yields 0 and 1. Separately assert global state unchanged. A previously bound callback keeps its originating scope under a nested Provider. A child's own useUnit reads its rendered Provider.

## Refusals and limits

Test missing Provider in isolation. Raw external event calls do not become scoped because a Provider exists on the page. Do not generalize the awaited-Hypergraph-effect test to all foreign async boundaries.

## Exercise

[Scopes lab](/examples/reflect-lab/index.html?part=scopes&lang=en). Per-panel reset changes its model; footer restart recreates the whole stage. Source: reflect.ts:108-117, composition.test.ts:80-105; npm 4.1.1.

## Navigation

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