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glm-5.1 c9c32a6aa6 decompose reconciler roadmap into 20 implementation tasks across 5 phases

Tasks follow the architecture spec phases:
- Phase 0: key field on UElement (2 tasks + review)
- Phase 1: reactive-host bridge / fiber tree (4 tasks + review)
- Phase 2: key-based children reconciliation (3 tasks + review)
- Phase 3: unmount & dispose support (4 tasks)
- Phase 4: TypeBox value optimizations (4 tasks)

Validated with taskgraph CLI: no cycles, 15 parallel generations,
3 high-risk tasks identified (signal-driven-updates, commit-mutations,
fiber-disposal).

2026-05-18 16:26:52 +00:00

1.7 KiB

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id, name, status, depends_on, created, modified, scope, risk, impact, level

name

status

depends_on

created

modified

scope

risk

impact

level

key-on-uelement

Add key field to UElement

pending

2026-05-18T16:22:57.098951833Z

2026-05-18T16:22:57.098952376Z

narrow

low

component

implementation

Description

Add key?: string as a first-class field on UElement in both the TypeScript type and the TypeBox Module schema. This is Reconciler Roadmap Phase 0 (ADR-004).

The key field enables identity-based children matching in the reconciler. Without it, reconciliation is positional-only, which breaks when children are reordered, inserted, or removed. key is a reconciler concern, not a component concern — it must live outside props so that component schemas don't need to declare it and component functions never receive it.

URoot does NOT get a key field. Roots are unique per createRoot() call and are never children of another element.

Acceptance Criteria

UElement TypeScript type has key?: string field
TypeBox Module UElement schema includes Type.Optional(Type.String()) for key
URoot TypeScript type has no key field
URoot TypeBox schema has no key field
isUElement type guard still correctly discriminates UElement from URoot
Existing tests pass (npm run test)
New test: UElement with key field validates and type-checks
New test: UElement without key field still works (backward compatible)

References

docs/architecture/schema.md — Known Gaps: key field on UElement
docs/architecture/decisions/004-key-as-first-class-field.md — ADR-004
docs/architecture/reconciler.md — Reconciler Roadmap Phase 0

Notes

To be filled by implementation agent

Summary

To be filled on completion

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