feat(react): add createPortal support by upupming · Pull Request #2501 · lynx-family/lynx-stack

upupming · 2026-04-21T16:33:05Z

Note

Depends on #2500 (ref-apply dedup) for the idiomatic ref={setState} pattern; the skipped test block flips to describe once #2500 lands.

Summary

createPortal(children, container) from @lynx-js/react. container is a ref to a ReactLynx element marked with the new portal-container attribute.
New compile-time attribute portal-container — SWC pre-pass (swc_plugin_portal_container) emits a snapshot with a single empty slot at element_index 0, which is exactly what createPortal validates.

Usage

function App() {
  const hostRef = useRef(null);
  const [host, setHost] = useState(null);
  useEffect(() => setHost(hostRef.current), []);
  return (
    <view>
      <view portal-container ref={hostRef} />
      {host && createPortal(<text>hi</text>, host)}
    </view>
  );
}

portal-container element must have no children (compile error otherwise).
Only static-truthy values transform; ={false} / dynamic exprs are no-ops.
Null/undefined container renders nothing (mirrors ReactDOM).
Refs from lynx.createSelectorQuery() or third-party sources throw.

Notes

Context propagates across the portal; events do not bubble through the React tree (preact has no synthetic event system) — they follow the physical element tree.
delay.ts stays cycle-free by keeping only refProxyRefAttr: WeakMap<object, [siId, expIndex]>; snapshot/refProxyBackgroundSnapshotInstance.ts composes it with the snapshot manager.

Test plan

pnpm --filter @lynx-js/react-runtime test (coverage 100% on portals.ts)
pnpm --filter @lynx-js/react-testing-library test — block (A) 11/11 green
cargo test -p swc_plugin_portal_container -p swc_plugin_snapshot
pnpm run api-extractor
fix(react): handle ref changes across rerenders before hydration #2500 merged, describe.skip flipped

Public API: `createPortal(children, container)` where `container` is a ref obtained from a `<view ref={...}/>`. Wraps preact/compat's createPortal and resolves the ref to its backing BackgroundSnapshotInstance. Internal layout chosen to avoid `delay.ts` taking an import dependency on `backgroundSnapshot.ts` (which would close a cycle via `backgroundSnapshot.ts → snapshot/ref.ts → delay.ts`): - `delay.ts` exposes `refProxyRefAttr`, a WeakMap that only stores the `[snapshotInstanceId, expIndex]` tuple for each minted RefProxy. - `snapshot/refProxyBackgroundSnapshotInstance.ts` (new) composes that WeakMap with `backgroundSnapshotInstanceManager` to produce the `.get(ref)?.()` resolver consumed by `createPortal`. The test file runs the useRef+useEffect variant today; the idiomatic `ref={setState}` variant is kept as a parallel `describe.skip` block and will be un-skipped once the ref-apply dedup fix lands here from the companion PR.

changeset-bot · 2026-04-21T16:33:11Z

🦋 Changeset detected

Latest commit: e0f4a9f

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@lynx-js/react	Patch
@lynx-js/react-umd	Patch

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coderabbitai · 2026-04-21T16:33:13Z

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codecov · 2026-04-21T16:35:38Z

Codecov Report

❌ Patch coverage is 58.29596% with 93 lines in your changes missing coverage. Please review.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...ted_portal_container_extracts_separate_snapshot.js	0.00%	38 Missing ⚠️
...ransform/crates/swc_plugin_portal_container/lib.rs	83.47%	20 Missing ⚠️
...andalone_portal_container_emits_slot_at_index_0.js	0.00%	16 Missing ⚠️
...orthand_attribute_wraps_child_in_expr_container.js	0.00%	4 Missing ⚠️
packages/react/transform/src/lib.rs	0.00%	4 Missing ⚠️
...es/react/transform/swc-plugin-reactlynx/src/lib.rs	0.00%	4 Missing ⚠️
...apshots__/lib.rs/without_attribute_is_untouched.js	0.00%	3 Missing ⚠️
...s/dynamic_value_is_stripped_but_not_transformed.js	0.00%	1 Missing ⚠️
...s/literal_false_is_stripped_but_not_transformed.js	0.00%	1 Missing ⚠️
..._snapshots__/lib.rs/literal_true_is_transformed.js	0.00%	1 Missing ⚠️
... and 1 more

📢 Thoughts on this report? Let us know!

codspeed-hq · 2026-04-21T17:30:13Z

Merging this PR will improve performance by 8.86%

⚠️

Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

⚡ 1 improved benchmark
✅ 80 untouched benchmarks
⏩ 26 skipped benchmarks¹

Performance Changes

	Benchmark	`BASE`	`HEAD`	Efficiency
⚡	`002-hello-reactLynx-destroyBackground`	893.7 µs	821 µs	+8.86%

_{Comparing feat/support-portal (e0f4a9f) with main (b1809ef)}

26 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

relativeci · 2026-04-21T17:36:09Z

Web Explorer

#9242 Bundle Size — 900.02KiB (0%).

e0f4a9f(current) vs b1809ef main#9240(baseline)

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	Current #9242	Baseline #9240
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	Current #9242	Baseline #9240
JS	`495.88KiB`	`495.88KiB`
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relativeci · 2026-04-21T17:36:11Z

React Example

#7669 Bundle Size — 225.43KiB (+0.02%).

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4 changes

1 regression

	Current #7669	Baseline #7667
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	Current #7669	Baseline #7667
IMG	`145.76KiB`	`145.76KiB`
Other	`79.67KiB` (`+0.06%`)	`79.63KiB`

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relativeci · 2026-04-21T17:36:11Z

React MTF Example

#801 Bundle Size — 196.59KiB (+0.03%).

e0f4a9f(current) vs b1809ef main#799(baseline)

Bundle metrics

4 changes

1 regression

	Current #801	Baseline #799
Initial JS	`0B`	`0B`
Initial CSS	`0B`	`0B`
Cache Invalidation	`43.4%`	`0%`
Chunks	`0`	`0`
Assets	`3`	`3`
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Duplicate Code	`44.12%`(`+0.09%`)	`44.08%`
Packages	`2`	`2`
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1 change

1 regression

	Current #801	Baseline #799
IMG	`111.23KiB`	`111.23KiB`
Other	`85.36KiB` (`+0.06%`)	`85.31KiB`

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relativeci · 2026-04-21T17:36:17Z

React External

#785 Bundle Size — 684.64KiB (+0.64%).

e0f4a9f(current) vs b1809ef main#783(baseline)

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1 change

	Current #785	Baseline #783
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Initial CSS	`0B`	`0B`
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Bundle size by type

1 change

1 regression

	Current #785	Baseline #783
Other	`684.64KiB` (`+0.64%`)	`680.27KiB`

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- Introduce `swc_plugin_portal_container` pre-pass that expands a truthy `portal-container` attribute into `{<elem>{null}</elem>}`, forcing the host to be emitted as its own snapshot with a single empty slot at element_index 0 — exactly the shape `createPortal` validates. - `createPortal` now short-circuits null/undefined containers, and rejects refs whose backing snapshot doesn't carry the empty slot, pointing users at `portal-container` in the error message. - Add the `'portal-container'?: boolean` prop in `@lynx-js/types`. - Wire `createPortal` into the `lazy/` re-exports so the lazy-exports parity test stays green. - Tests: new rust unit + composed tests for the pre-pass, runtime unit tests covering all createPortal branches, and a testing-library negative test plus an element-tree bubble check.

Allow framework-internal `__root` (imported from `@lynx-js/react/internal`) to be passed directly to `createPortal`, rendering children under the page root without requiring a `portal-container`-marked host element.

This reverts commit b2b9776.

This reverts commit c04aea3.

- fireEvent.tap/longtap now default to bubbles: true, matching the Lynx runtime where bind/catch listeners fire in the bubble phase - Skip read-only Event accessors (bubbles/cancelable/composed) in Object.assign so the EventInit dict isn't reassigned (strict-mode TypeError on Event.prototype getters) - Cover bind/catch/capture-bind/capture-catch propagation in events.test.jsx - Enable portal tests for the ref={setState} pattern

… to patch Portal support is implemented as a small runtime adjustment without adding a new public API surface, so a patch bump is sufficient.

The useRef + useEffect dance is a workaround; the idiomatic ref-as-callback form already works.

Adds a fixture-level describe block exercising the portal-container plugin through the full transformReactLynx pipeline: standalone snapshot shape, separate-snapshot extraction when nested, the children-not-allowed error, and the ={false} short-circuit. The plugin's own crate tests live in Rust; these pin the JS-side output.

Per the Lynx TouchEvent spec only TouchEvent-family events have capture/bubble phases, so extend the bubbles: true default from tap/longtap to touchstart/touchmove/touchend/touchcancel. Other LynxEvent entries (bgload, transitionend, layoutchange, …) stay non-bubbling — that matches Lynx where they have no symmetric capture-bind/capture-catch API.

In @lynx-js/types every event whose handler signature is EventHandler<BaseTouchEvent<T>> is part of the TouchEvent family — that includes longpress alongside tap/longtap/touch{start,move,end, cancel}. Make the fireEvent default bubbling reflect that, and extend the parametrized bubble test to cover longpress.

…date

createPortal's signature was tightened to require a NodesRef; the 'returns null when container is null or undefined' case is gone (the matching test in @lynx-js/react testing-library was already removed when the API was changed). Remove the runtime-side counterpart and sync the JSDoc.

# Conflicts: # packages/react/transform/src/lib.rs # packages/react/transform/swc-plugin-reactlynx/src/lib.rs

The dedicated refProxyBackgroundSnapshotInstance.ts wrapper added an extra getter indirection and a hydrationMap remap that createPortal doesn't need — the call site already runs after mount, where backgroundSnapshotInstanceManager is keyed by the same id stored in refProxyRefAttr. Drop the helper file and look up the bsi directly in portals.ts.

Renders a vnode subtree into a different ReactLynx element identified by a `NodesRef` (from `ref={setX}` or `lynx.createSelectorQuery()`), without requiring any compile-time marker attribute. Implementation routes portal ops through the existing SnapshotInstance/patch abstraction: - New `nodesRefInsertBefore` / `nodesRefRemoveChild` patch ops; carried via the regular `LifecycleConstant.patchUpdate` channel alongside BSI CreateElement / InsertBefore / RemoveChild ops. - `fakeRoot.insertBefore` wires `child.__parent = fakeRoot` so preact's `removeNode` (which walks `child.parentNode.removeChild`) routes through portal removeChild, otherwise unmount silently no-ops. - Pre-hydrate Portal mounts queue into `pendingInsertBefore`; `clearPendingPortalInsertBefore` (called from hydrate) replays the BSI subtree's dropped CreateElement / SetAttributes / internal InsertBefore ops via `reconstructInstanceTree`, then attaches the subtree to host via `nodesRefInsertBefore`. - `reconstructInstanceTree` extracted to its own module so portal's pre-hydrate replay can share the helper without forming an import cycle with `backgroundSnapshot.ts`. Different design from #2501 (which uses a `portal-container` SWC transform to lift the host subtree into a separate snapshot) — this one stays inside the existing SnapshotInstance/patch model so hydrate diff and future first-screen-direct-render paths can be reused without protocol changes. Tests cover pre-/post-hydrate mount, unmount via `componentWillUnmount`, container swap, multi-child reorder + prepend, context propagation across portal boundary, ctx-not-found soft-fail on apply, and host selector miss; runtime test env gets `__GetPageElement` / `__QuerySelector` mocks.

Renders a vnode subtree into a different ReactLynx element identified by a `NodesRef` (from `ref={setX}` or `lynx.createSelectorQuery()`), without requiring any compile-time marker attribute. Implementation routes portal ops through the existing SnapshotInstance/patch abstraction: - New `nodesRefInsertBefore` / `nodesRefRemoveChild` patch ops; carried via the regular `LifecycleConstant.patchUpdate` channel alongside BSI CreateElement / InsertBefore / RemoveChild ops. - `fakeRoot.insertBefore` wires `child.__parent = fakeRoot` so preact's `removeNode` (which walks `child.parentNode.removeChild`) routes through portal removeChild, otherwise unmount silently no-ops. - Pre-hydrate Portal mounts queue into `pendingInsertBefore`; `clearPendingPortalInsertBefore` (called from hydrate) replays the BSI subtree's dropped CreateElement / SetAttributes / internal InsertBefore ops via `reconstructInstanceTree`, then attaches the subtree to host via `nodesRefInsertBefore`. - `reconstructInstanceTree` extracted to its own module so portal's pre-hydrate replay can share the helper without forming an import cycle with `backgroundSnapshot.ts`. Different design from #2501 (which uses a `portal-container` SWC transform to lift the host subtree into a separate snapshot) — this one stays inside the existing SnapshotInstance/patch model so hydrate diff and future first-screen-direct-render paths can be reused without protocol changes. Tests cover pre-/post-hydrate mount, unmount via `componentWillUnmount`, container swap, multi-child reorder + prepend, context propagation across portal boundary, ctx-not-found soft-fail on apply, and host selector miss; runtime test env gets `__GetPageElement` / `__QuerySelector` mocks. testing-library suite includes a preact-parity case ported from internal-preact's `feat/portal-slot` branch verifying that portal content stays put while host's normal children toggle.

## Summary Adds `createPortal` to `@lynx-js/react`. Renders a vnode subtree into a different ReactLynx element identified by a `NodesRef` (from `ref={setX}` or `lynx.createSelectorQuery()`), with no compile-time marker required and arbitrary host structure permitted. ```tsx function App() { const [host, setHost] = useState(null); return ( <view> <view ref={setHost} /> {host && createPortal(<text>hi</text>, host)} </view> ); } ``` ## Different design vs #2501 This is an **alternative implementation** to #2501; both target the same feature with substantially different architectures. Brief comparison: | | #2501 | this PR | |---|---|---| | Marker on host | `portal-container` attr required | none required | | Compile-time work | SWC plugin lifts host subtree into a separate snapshot | no transform — pure runtime | | Host can have children | no (must be empty placeholder) | yes | | Patch protocol | new "detached subtree" lifecycle ops | two new ops on the existing `LifecycleConstant.patchUpdate` channel | | Hydrate diff path | bypassed (portal subtree is detached) | reused — portal subtree replays through `reconstructInstanceTree` | | First-screen direct render | needs separate machinery | future-compatible: portal ops sit in the same Snapshot abstraction the direct-render path already consumes | Concretely, this implementation routes everything through `SnapshotInstance` so no new lifecycle protocol is introduced; the trade-off is that pre-hydrate Portal mounts need an extra queue-and-replay step (`pendingInsertBefore` → `clearPendingPortalInsertBefore`) instead of being lifted by a transform. ## Limitation Currently `NodesRef` is a BTS type, we cannot get it on MTS. So IFR is not supported. ## Implementation notes - New patch ops: **`nodesRefInsertBefore(identifier, childId, beforeId?)`** / **`nodesRefRemoveChild(identifier, childId)`**. Carried via the existing `patchUpdate` channel alongside BSI `CreateElement` / `InsertBefore` / `RemoveChild` ops; no new protocol. - `fakeRoot.insertBefore` wires `child.__parent = fakeRoot` so preact's `removeNode` (which walks `child.parentNode.removeChild(child)`) routes through portal `removeChild`. Without this, unmount silently no-ops. - Pre-hydrate Portal mounts: BSI constructor's `CreateElement` push is dropped (global buffer is `undefined`), so `fakeRoot.insertBefore` queues into `pendingInsertBefore`. `clearPendingPortalInsertBefore` (called from `hydrate()`) replays the dropped subtree ops via `reconstructInstanceTree([child])`, then emits `nodesRefInsertBefore` to attach to host. - `reconstructInstanceTree` extracted to its own module (`snapshot/reconstructInstanceTree.ts`) so portal pre-hydrate replay can share the helper without forming an import cycle with `backgroundSnapshot.ts`. ## Test coverage Two test suites: **`runtime/__test__/snapshot/lynx/portals.test.jsx`** — unit tests on the runtime path (10 cases): - `createPortal` returns a VNode whose `containerInfo` points at the host - pre-hydrate → hydrate → unmount full lifecycle - post-hydrate Portal mount via state change - container swap (covers `_this._container !== container` path) - multi-child reorder + prepend (covers `before?.__id` truthy branch + apply `__InsertElementBefore`) - context propagation across portal boundary (`ContextProvider` wrapper) - `serializeNodesRef` non-RefProxy path - `nodesRefInsertBefore` / `nodesRefRemoveChild` ctx-not-found soft-fail - selector miss no-op **`testing-library/src/__tests__/portals.test.jsx`** — high-level scenarios mirroring PR #2501's portal.test.jsx (16 cases): basic render, re-render on portalled state change, context forwarding, event-bubbling semantics across portal boundary, third-party-slot pattern, mount/unmount toggle, cleanup on unmount, host swap. Runtime test env (`__test__/snapshot/utils/nativeMethod.ts`) gets `__GetPageElement` + `__QuerySelector` mocks (`[attr]` / `[attr=value]` selectors). Coverage: **100% lines / 100% branches / 100% functions / 100% statements** on the runtime suite. ## Test plan - [x] `pnpm -F @lynx-js/react-runtime test` — 570 passing, 100% coverage - [x] `pnpm -F @lynx-js/reactlynx-testing-library test:base -- src/__tests__/portals.test.jsx` — 16 passing - [ ] hand-review by owners on which design (#2501 or this) better fits the long-term path  ## Summary by CodeRabbit * **New Features** * Added createPortal() to render subtrees into alternate element targets via node-reference selectors. * **Tests** * Expanded portal test coverage: hydration, mount/hydrate/unmount flows, container swapping, insertion ordering, context propagation, selector-targeted portals, and teardown/regressions. * **Improvements** * Improved portal hydration replay and snapshot patch handling; enhanced node-reference resolution and testing-environment query helpers.

upupming added 7 commits April 23, 2026 00:25

Merge branch 'main' into feat/support-portal

57fbbc6

chore: refresh api-extractor report for createPortal

8d964b8

docs(changeset): add createPortal usage example

17a9e25

feat(react): accept __root as createPortal container

c04aea3

Allow framework-internal `__root` (imported from `@lynx-js/react/internal`) to be passed directly to `createPortal`, rendering children under the page root without requiring a `portal-container`-marked host element.

Merge remote-tracking branch 'origin/main' into feat/support-portal

cda2448

wip: try mts

b2b9776

upupming force-pushed the feat/support-portal branch from fa64fa9 to b2b9776 Compare April 27, 2026 12:39

upupming added 12 commits April 27, 2026 20:41

Revert "wip: try mts"

4af9bcf

This reverts commit b2b9776.

Revert "feat(react): accept __root as createPortal container"

ff139ca

This reverts commit c04aea3.

chore: changelog for testing-library bubble fix; downgrade react bump…

45c0669

… to patch Portal support is implemented as a small runtime adjustment without adding a new public API surface, so a patch bump is sufficient.

docs(react): simplify createPortal changelog to use ref={setState}

bde69bf

The useRef + useEffect dance is a workaround; the idiomatic ref-as-callback form already works.

chore(react): regenerate react.api.md after createPortal signature up…

6b34efa

…date

Merge remote-tracking branch 'origin/main' into feat/support-portal

df6f102

# Conflicts: # packages/react/transform/src/lib.rs # packages/react/transform/swc-plugin-reactlynx/src/lib.rs

upupming mentioned this pull request Apr 29, 2026

feat(react): createPortal via nodesRef patch ops #2543

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