# Reflect.7. Following a lifetime — Mercury LMS

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

## Hook semantics

hooks.mounted and hooks.unmounted accept callback/event/effect. They run in scope with resolved props captured for one lifetime. Ordinary prop changes do not refresh the cleanup capture. Scope replacement restarts the hook lifetime; keyed reorder does not; variant case changes do not restart wrapper hooks.

## Exercise

[Lifecycle lab](/examples/reflect-lab/index.html?part=lifecycle&lang=en): mount with Ada, change to Grace, unmount. View shows Grace; history should report mounted Ada and unmounted Ada. Remount captures Grace. This is an expected observation, not an automatic resource-leak verdict.

## Boundaries

Mounted return values are ignored; use unmounted, not an invented disposer-return protocol. Unmount before disposal. Whole-stage restart may itself generate cleanup. SSR runs neither hook; assert empty recorder and distinct scoped HTML independently. No lifecycle descriptors are shipped.

## Source

reflect.ts:64-73; README.md:155-161; collections.test.ts:163-170. npm 4.1.1.

## Navigation

- [HTML](/reflect/lifecycle)
- [Reflect](/reflect/llms.txt)
- [Index](/llms.txt)
- [Sitemap](/sitemap.xml)
- [All English companions](/llms-full.txt)