Cut 0.9.2: linear tree cascade, a guarded deselect path, and package checks that actually run in CI - #36
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…the package check in CI A repo-wide audit for stability and performance, three findings acted on. Selecting a tree parent cascaded to its descendants with `selected.includes()` per descendant before pushing, and deselecting did an `indexOf` plus a `splice` per descendant — both linear in the selection, so both grew with the product of the subtree and the selection. This is the same shape that `syncTreeAncestors()` was fixed for in 0.9.1, on the selection path rather than the reconciliation one. Membership now goes through one set built for the cascade, and deselection removes the whole subtree in a single filtered pass. Measured with a parent of N children, tags capped so the control's own rendering does not dominate: selecting it costs 8.4 ms at 8,000 children against 58.4 ms before, and the curve is now linear — 1,000 to 8,000 children scales 2.3x rather than 14x. With tags uncapped the same select goes 231 -> 150 ms at 4,000; the remainder is one tag element per selection, which is what maxVisibleTags addresses. Deselecting a parent turned out to have no test at all. With the descendant removal disabled the whole suite still passed: the children stayed selected, syncTreeAncestors() saw every child selected and put the parent straight back, and the click read as a no-op. Added a regression test that fails with exactly that symptom. Two smaller ones from the same pass. buildRows() builds one set for the maxSelections check instead of scanning the selection per option, and only when the cap is reached. The document-wide capture-phase scroll listener is now registered only for a portalled dropdown — its handler already returned immediately without a portal host, so an inline dropdown paid a call per scroll event anywhere on the page to reach that guard, and portalHost is built in the constructor so its existence is known before any open(). Finally, CI ran an inlined copy of check:package's pack commands rather than the script. The copy had drifted: the peer-range guard added with it runs in neither verify nor CI, so the check meant to stop a wrapper peer range from excluding the core it ships with was not running anywhere automatic. CONTRIBUTING.md already claimed CI ran check:package; now it does. 202 tests pass. Bundle 14,353 gzipped against the 14,500 budget; benchmark budgets all pass (rendered rows 18/30, residual nodes 0). Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Uwf2dANjPuEZB2RXEjCtFU
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drafts: true📝 WalkthroughWalkthroughThe select component now uses set-based selection checks, filtered descendant removal, conditional scroll-listener registration, and cached row membership checks. CI now invokes the shared package validation script. Tests cover parent deselection cascading. ChangesSelection and CI validation
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: 🔵 Low · up to Tree-selection behavior and package validation are improved, but CI will perform redundant builds and the API documentation will not reflect the changed selection and portalled-dropdown behavior. These are bounded follow-ups rather than release-blocking runtime risks. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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In @.github/workflows/ci.yml:
- Line 85: Update the CI job around npm run check:package and the earlier build
steps so core and workspace packages are built only once. Either split
check:package into separate build and pack phases or remove the duplicate build
commands while preserving the package validation behavior.
In `@CHANGELOG.md`:
- Around line 12-14: Update docs/api-reference.md to document the tree selection
performance improvements, the optimized maxSelections handling in buildRows(),
and that the capture-phase scroll listener is registered only for portalled
dropdowns. Keep the documentation aligned with the corresponding CHANGELOG.md
entry and avoid unrelated documentation changes.
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Pointing CI's package step at `check:package` fixed the drift but made the job build the core and both workspaces twice: the script starts with those builds, and the job had already run them as its own steps. The checks themselves now live in `check:package:built`, and `check:package` is that preceded by the builds. CI, which arrives already built, runs `check:package:built`; a contributor with an unbuilt tree still runs `check:package` and gets both. The list of checks stays in one place, which is the property whose absence let the job skip the peer-range guard. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Uwf2dANjPuEZB2RXEjCtFU
Folds the entries that had accumulated under Unreleased into one 0.9.2 section: the tree-cascade and buildRows selection work and the portalled-only scroll listener from this PR, the peer-range guard and re-measured README figures from the previous one, and the two CI/test fixes. The Unreleased block had grown two Changed headings and a stray bullet because 0.9.1 was already released when the earlier entries landed; they are merged rather than moved wholesale. CDN pins in the README go to 0.9.2. The wrappers stay at 0.7.1 — nothing in this release touches them, and their `>=0.8.0 <1.0.0` peer range admits it, which `check:package` confirms. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Uwf2dANjPuEZB2RXEjCtFU
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September 5, 2026 09:35
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What & why
A repo-wide audit for stability and performance. Four findings acted on here; the rest are written up at the end rather than bundled in.
1. The tree cascade was quadratic on both the select and the deselect path. Selecting a parent pushed each descendant after an
Array.includes()over the current selection; deselecting did anindexOfplus aspliceper descendant, each itself linear. Both grew with the product of the subtree and the selection — the same shapesyncTreeAncestors()was fixed for in 0.9.1, but on the selection path rather than the reconciliation one, so the earlier fix did not reach it. Membership now goes through one set built for the cascade; deselection removes the whole subtree in a single filtered pass.Measured over a parent of N children, five runs, median, with the tag list capped so the control's own rendering does not dominate what is being measured:
The point is the curve, not the endpoint: 1,000 → 8,000 children now scales 2.3×, not 14×. With tags uncapped the same select goes 231 ms → 150 ms at 4,000 children; the remainder is one tag element per selection, which is what
maxVisibleTagsexists for, and this change is orthogonal to it.2. Deselecting a tree parent had no test at all. Found by fault injection: with the descendant removal disabled the entire 201-test suite still passed. The failure it hides is worse than two stranded values — the children stay selected,
syncTreeAncestors()then sees every child selected and puts the parent straight back, and the click reads as doing nothing. The added regression test fails with exactly that symptom (['apple','banana','fruits']where[]is expected).3. CI ran an inlined copy of
check:packagerather than the script, and the copy had drifted. The peer-range guard added in #35 runs in neitherverifynor CI, so the check meant to stop a wrapper peer range from excluding the core it ships with was not running anywhere automatic — it would not have caught the very bug it was written for.CONTRIBUTING.mdalready claimed CI rancheck:package; now it does.4. Two smaller ones from the same pass.
buildRows()builds one set for themaxSelectionscheck instead of scanning the selection per option, and only when the cap is actually reached. The document-wide capture-phase scroll listener is now registered only for a portalled dropdown — its handler already returned immediately without a portal host, so an inline dropdown paid a call per scroll event anywhere on the page just to reach that guard (portalHostis built in the constructor, so its existence is known before anyopen()).Not in this PR — proposed, for you to weigh
fetchRemoteResult()dedupes by cache key and hands the same promise to every caller, but the underlying request is bound to whichever caller'sAbortSignalcreated it. So a second caller'sabort()silently fails to cancel, and a first caller's abort rejects the second — whose owncatchchecks only its ownsignal.aborted, so it would treat that as a genuine load failure, wipedata, and emiterror. Today the only abort of a prefetch controller is indestroy(), which is separately guarded, so this is latent rather than live. Fix is small (also treatAbortErroras non-fatal, or scope the dedupe per signal) but it needs a test that reproduces the race.testjob is one serial 13-step job including three browsers and the benchmark. Splitting Playwright into its own job would cut wall-clock without changing coverage.npm audit --audit-level=moderategates every PR, so a new advisory in a dev dependency turns unrelated PRs red. Moving it to a scheduled job keeps the signal without blocking work — a policy call, so I have not made it.Checklist
docs/(andREADME.mdif the public API changed) — no public API or documented behavior changed; nodocs/page describes the cascade internalsCHANGELOG.mdentry under[Unreleased]maxSelectionschange are covered by existing tests (also verified by fault injection: 4 and 1 failures respectively)npm run verifypasses locally — 202 tests, 92.35% lines;npm run check:packagegreen; benchmark budgets pass (14,353 gzipped against 14,500, rendered rows 18/30, residual nodes 0)🤖 Generated with Claude Code
https://claude.ai/code/session_01Uwf2dANjPuEZB2RXEjCtFU
Generated by Claude Code
Summary by CodeRabbit
Bug Fixes
Performance