fix(store): hydrate a store by its node's own path, not its parent's - #20
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`prepareHydration` keyed each persisted store by `node.path.slice(0, -1)` —
the node's ANCESTOR path — while `createStore` looked it up by the current
resource path, which is the same thing. Two keyed siblings therefore share one
hydration entry, so the last one persisted overwrites the others and every
sibling restores its state on the next boot.
The persistence side was already correct: each sibling is saved under its own
`<kebab-name>-<key>` node. Only the restore lookup discarded the segment that
makes them distinct.
Minimal reproduction (before this change, both restore "B"):
function Holder(props: { seed: string }) {
const [state] = createStore({ value: props.seed });
useAsyncOutput({ seed: props.seed }, async (_p, setOutputs) =>
setOutputs({ value: state.value }));
return <></>;
}
<><Holder key="a" seed="A" /><Holder key="b" seed="B" /></>
Both sides now key by the node's own full path. `createStore` runs before
`useAsyncOutput` has pushed the component's segment, so the segment is derived
the same way in both places — extracted into `runtime/identity.ts` because
`render.ts` (the store attach hook) and `instance.ts` (node ids) both need it
and cannot import each other.
This matters for per-entity state: a component rendered per item in a `<For>`
could not own a `createStore` at all, which pushed that state into outputs
purely to work around the collision.
Tests: a new end-to-end regression (keyed siblings each restore their own
store through a real Memory), plus a unit test that a node's store is not
handed to its parent path. Three existing hydration tests encoded the old
`slice(0, -1)` contract and now address nodes by their own path. Full suite
green: 658 creact + 25 testing, typecheck clean.
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📝 WalkthroughWalkthroughThe change centralizes component instance naming and uses complete node paths for store persistence and hydration. Keyed sibling components now restore separate snapshots. Tests cover exact-path hydration, nested components, copy isolation, and restart persistence. ChangesKeyed store identity
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🔵 Low · up to The change correctly targets per-node store restoration, but the restart regression test reuses the same seed values after restart, so it could pass even if hydration failed and stores were merely reinitialized. This is a bounded merge-readiness risk requiring test correction or explicit owner acceptance. Sequence Diagram(s)sequenceDiagram
participant Component
participant Render
participant Store
participant Persistence
Component->>Render: render with instance name
Render->>Store: hydrate using complete node path
Store->>Persistence: read matching keyed snapshot
Persistence-->>Store: return component snapshot
Store-->>Component: restore isolated store state
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✨ Finishing Touches 💡 1🛠️ Fix failing CI checks 💡
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🧪 Generate unit tests (beta)
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Inline comments:
In `@packages/creact/src/store/__tests__/store.test.tsx`:
- Around line 515-550: Update the keyed sibling restart test around the app
render so the second render uses different seed values from the initial render,
while retaining the expected restored values from the first render. Keep the
Holder and restoration flow unchanged, ensuring the assertion verifies hydration
rather than fallback initialization.
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packages/creact/src/runtime/identity.tspackages/creact/src/runtime/instance.tspackages/creact/src/runtime/render.tspackages/creact/src/store/__tests__/store.test.tsxpackages/creact/src/store/store.ts
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…boot With the same seeds on both renders, a total hydration failure fell back to those seeds and looked exactly like a successful restore — the test could not tell "restored" from "re-initialized". The second boot now seeds X/Y while still expecting A/B, so only a real restore passes. Verified by reverting the hydration keying: the test fails with ['X','Y'].
1 participant
The bug
prepareHydrationkeys each persisted store by the node's ancestor path:and
createStorelooks it up bygetCurrentResourcePath()— which is thatsame ancestor path, because
createStoreruns beforeuseAsyncOutputpushesthe component's own segment.
So two keyed siblings share one hydration entry. The last one persisted
overwrites the others, and on the next boot every sibling restores that one's
state.
The persistence side was already right — each sibling is saved under its own
<kebab-name>-<key>node. Only the restore lookup discarded the segment thatmakes them distinct.
Reproduction
Before this change both holders restore
"B":What was actually persisted — correct all along:
Both
path.slice(0, -1)to"", soBwins for both.The fix
Key both sides by the node's own full path.
createStoreneeds the component's own segment beforeuseAsyncOutputhaspushed it, so the derivation moved into
runtime/identity.ts—render.ts(the store attach hook) and
instance.ts(node ids) both need it and cannotimport each other.
instance.tsnow builds its address from the same helper,so the two cannot drift.
Why it matters
A component rendered per item in a
<For>could not own acreateStoreatall. Per-entity state had to be pushed into outputs purely to work around the
collision, which is a real constraint on how state gets modelled.
Tests
through a real
Memoryacross a restart.slice(0, -1)contract andnow address nodes by their own path.
Full suite green: 658 creact + 25 testing,
tsc --noEmitclean.Compatibility
Hydration keys change shape, so stores checkpointed by an older version are
not matched after upgrading — they fall back to their initial value. Outputs
are unaffected.
Summary by CodeRabbit