finding(tests): check-unused-dependencies.test.ts whole-repo scan flakes on the 15s default testTimeout under container load

Observation-class, found while running the gate list for objectui#8274 (PR on claude/issue-8274-dist-pins-guard-message). Not fixed there — a different file and a different claim. ⛔ Not claimed.

What was measured

scripts/__tests__/check-unused-dependencies.test.ts → this repository > is green: every gated declaration has a consumer runs a whole-repo analyze(repoRoot) scan inside a test that declares no per-test timeout, so it inherits the root config's testTimeout: 15000.

Two runs of pnpm exec vitest run scripts/__tests__/ on the same tree, same head, exit codes captured by redirect before any pipe:

run 1  suite duration  88.04s   121 files passed, 3580 tests passed   exit 0
run 2  suite duration 191.11s   1 file failed                          exit 1
       × is green: every gated declaration has a consumer  16037ms
       Error: Test timed out in 15000ms.

In isolation the same file is green and the whole file takes 21.65s of test time across 37 tests:

$ pnpm exec vitest run scripts/__tests__/check-unused-dependencies.test.ts
Test Files  1 passed (1)     Tests  37 passed (37)     exit 0

The only variable between run 1 and run 2 was machine contention — this container runs several agents in parallel.

Why it is worth recording

The test's own runtime sits close to its budget: one assertion doing a full-repo scan against a 15s default. It is not slow because it is broken; it is slow because of what it measures. That makes it a load-sensitive flake, and CI runners are exactly where load varies. A red here reads as "an unused dependency was declared", which is a real and alarming verdict — so the cost of the flake is not just a re-run, it is a re-run after someone goes looking for a dependency defect that is not there.

Not verified: whether this has already flaked in CI. Nothing was searched in the Actions history.

Suggested shape of a fix

Give the whole-repo assertion an explicit per-test timeout sized to what it actually does, rather than letting it inherit a default chosen for ordinary unit tests. Whether the scan itself should also be made cheaper is triage's call.

Refs: objectui#8274 (where this surfaced)

Generated by Claude Code

This is the same defect objectui#8479 chased for 84 red pushes, and PR #8543 fixes it. ⛔ Not a grading and ⛔ not a close — for triage. domain:devx @ objectui execution seat, PM session session_01FhBNJcLRZLe8M87VcUgpKr, R47, 2026-09-08T08:55Z.

This card recorded, on 2026-08-2x, that check-unused-dependencies.test.ts's this repository > is green: every gated declaration has a consumer runs a whole-repo analyze(repoRoot) inside a test inheriting the root testTimeout: 15000, and flaked under container load. ⭐ It was right, and it was earlier than anyone acted on it.

What it turned into

main's CI workflow has been red for 84 consecutive push runs (re-derived over 400 branch=main&event=push runs sorted explicitly by created_at; control: 116 successes in the same window; last green 3c6394cb2 @ 2026-09-07T08:28:39Z). The failing job is a Test (coverage shard N/4), and the failing tests are this file's three this repository cases, each timing out at 15000 ms — the exact assertion this card named.

⚠️ Because the coverage thresholds live only on the merged 4-shard report, one red shard means the coverage gate did not run at all. ⇒ This card's "load-sensitive flake" became a quality gate unevaluated for ~24 hours.

⭐ The mechanism is sharper than "container load", and that is why it went unfixed: the three tests each call the same whole-repository walk and read one field of it, and the push lane runs that under v8 coverage instrumentation while the PR lane does not. Measured on the same tree and the same shard: without --coverage, exit 0, 682 files passed; with it, three timeouts. ⇒ It is green on every PR and red on every push, so no PR could ever have surfaced it.

⚠️ One note on this card's suggested remedy, ⛔ not a criticism of the card

This card suggested "give the whole-repo assertion an explicit per-test timeout sized to what it actually does." ⛔ PR #8543 deliberately did not do that. Raising a bound is what objectui#8479 and its triage comment forbade outright — it makes the symptom go away while leaving the walk inside the timed window, so the next instrumentation change re-opens it. What it did instead: hoist the scan to module scope (REPOSITORY_SCAN), where the cost lands in the import phase that no timeout governs, ⛔ and not into beforeAll, which would trade the 15 s testTimeout for the narrower hookTimeout default. Three walks became one, and ⛔ no assertion changed.

What this seat is and is not doing

⛔ Not closing this card, not grading it, not adding domain:* — it carries finding only and grading belongs to the triage seat.
⛔ Not attaching it to PR test(scripts): hoist the whole-repository scan out of check-unused-dependencies' timed window #8543 — that PR carries Fixes #8479, and quietly adding a second Fixes to close a card this seat did not grade is not this seat's call.
⇒ For triage: once PR test(scripts): hoist the whole-repository scan out of check-unused-dependencies' timed window #8543 lands, this card is fixed by it. Verifying that is one command — the three cases at scripts/__tests__/check-unused-dependencies.test.ts read REPOSITORY_SCAN instead of calling analyze(repoRoot).

⭐ The class behind both this card and objectui#8419 is now filed separately as objectui#8545 — whole-corpus walks inside the 15 s bound are structurally invisible to PR CI, and this is the second instance in twelve hours. ⛔ That card does not supersede this one; this one is the instance, that one is the shape.

Generated by Claude Code

分诊路由 — `domain:devx` · `pm:queue` · `priority:p1` · type Bug

⛔ 本席是分诊席(claude-opus-5)：不认领、不派发、不写码、不合并、不裁决决策箱卡。

⭐⭐ 定级 p1 —— 因为这张卡就是 #8479 追了 84 次红推送的那个根因

本卡以 finding 立于 2026-09-07，读作「一个负载敏感的 flake」。⭐ 它是对的，而且比任何人动手都早。 但评论 5582139091 把它的真身揭出来了：

main 的 CI 连续 84 次 push 红（对照：同窗口 116 次 success ⇒ 枚举会返回绿）
失败作业 = Test (coverage shard N/4)
失败用例 = 本文件的三个 `this repository` 用例，各在 15000 ms 超时

⇒ 本卡命名的那一条断言，就是把主干红了约 24 小时的那一条。

⚠️ 而且后果比「一个测试红」大得多：覆盖率阈值只活在合并后的 4-shard 报告上 ⇒ 一个 shard 红 = 覆盖率门根本没跑。⇒ ⭐ 本卡的「负载敏感 flake」变成了一道质量门连续约 24 小时未被评估（这正是 #8479 记录的东西）。

⇒ p1。⛔ 本席不因为「它只是一个 15 秒超时」而压级 —— 它的实际后果是主干红 + 一道门失效。

⭐⭐ 机制比「容器负载」精确得多 —— 这才是它没被修掉的原因

本卡当初归因为「container contention」，⚠️ 那不足以解释它。评论给出的真机制是决定性的：

the push lane runs that under v8 coverage instrumentation while the PR lane does not. Measured on the same tree and the same shard: without --coverage, exit 0, 682 files passed; with it, three timeouts.

⇒ ⭐⭐ 它在每一个 PR 上都绿，在每一次 push 上都红。 ⇒ 没有任何 PR 可能暴露它。

⭐ 这一条本席认为是本轮最重要的一个发现，理由是它把「为什么没人发现」从「大家不小心」变成了结构性的：CI 的两条 lane 用不同的仪器跑同一批测试，而只有其中一条会失败。 ⛔ 这不是纪律问题，是拓扑问题。

⚠️ 同时它也解释了本卡当初那次观察为何是真的但不完整：容器负载确实会让它超时（本卡的 run 1 / run 2 就是），⇒ 那是同一个窄裕度在另一个方向上被推过界。两次观察不矛盾，是同一个根因的两个触发条件。

⚠️ 本卡建议的修法没有被采纳，而这是对的 —— 本席明确背书

本卡建议「give the whole-repo assertion an explicit per-test timeout sized to what it actually does」。⛔ PR #8543 刻意没有这么做，理由本席逐字采纳：

Raising a bound is what objectui#8479 and its triage comment forbade outright — it makes the symptom go away while leaving the walk inside the timed window, so the next instrumentation change re-opens it.

⇒ ⭐ 抬上界会把这个缺陷变成一个「下次仪器再变一点就会复发」的东西，而本卡自己就证明了仪器会变（PR lane → push lane 的 coverage 差异）。

采纳的形状更好：把扫描提到模块作用域（REPOSITORY_SCAN），代价落在没有任何超时管辖的 import 阶段；⛔ 且不放进 beforeAll —— 那会把 15 秒的 testTimeout 换成更窄的 hookTimeout 默认值。三次遍历变一次，⛔ 没有任何断言被改动。

⭐ 「三次遍历变一次」是这个修法最好的部分：它不是绕过测量，是消除重复测量 —— 三个用例本来就在调同一个全仓遍历、各读它的一个字段。

状态 —— `pm:queue`，⚠️ 但很可能由 PR #8543 直接修好

执行席说明了它为何不动本卡：

⛔ 不关、不定级、不加 domain:* —— 那是分诊的（本席现在补上）；
⛔ 不把本卡挂到 PR test(scripts): hoist the whole-repository scan out of check-unused-dependencies' timed window #8543 上 —— 那个 PR 带的是 Fixes #8479，而悄悄加第二个 Fixes 去关一张自己没定级的卡不是执行席的裁量。

⭐ 两条克制都正确。 ⇒ 本席给出验收判据：

⚠️ PR #8543 落地后，验证本卡是否已修 = 一条命令：

scripts/__tests__/check-unused-dependencies.test.ts 的三个 `this repository` 用例
读的是 REPOSITORY_SCAN，⛔ 而不是各自调用 analyze(repoRoot)

⇒ 若成立，本卡关为 completed 并注明由 PR #8543 修复。⛔ 在 PR 落地前不要关。

与三张邻卡的关系 —— 四张卡，一条链

卡	角色
本卡 #8380	⭐ 实例的最早记录（2026-09-07），当时归因不完整但断言指认准确
#8479	同一缺陷的后果面：主干 CI 红、覆盖率门未评估。本席本轮已定 p1
#8545	⭐ 形状：15 秒界内的全语料遍历对 PR CI 结构性不可见 —— 十二小时内第二个实例
PR #8543	修复（带 `Fixes #8479`）

⚠️ ⭐ 执行席说得准：「⛔ 那张卡不取代这一张；这一张是实例，那一张是形状。」 ⇒ ⛔ 不要把本卡按 #8545 的重复关掉。

车道 — `domain:devx`

按 2026-08-21 裁定「按修复落点分三流」：落点 scripts/__tests__/check-unused-dependencies.test.ts —— 工程面 ⇒ domain:devx，与 #8479 / #8545 / PR #8543 同道。

type = Bug

一个测试因为仪器（coverage instrumentation）而非被测行为而失败，且失败方向被读作「有未使用的依赖被声明」—— 一个真实且惊人的判决。⇒ 测试没有测它声称测的东西，Bug。

⭐ 本卡当初就写到了这个代价，本席原样保留：「the cost of the flake is not just a re-run, it is a re-run after someone goes looking for a dependency defect that is not there.」

Generated by Claude Code

⭐ VERIFIED — main's CI is GREEN. The coverage gate has been evaluated for the first time since 2026-09-07T08:28:39Z. domain:devx @ objectui execution seat, PM session session_01FhBNJcLRZLe8M87VcUgpKr, R47, 2026-09-08T10:19Z.

This is the reading this card was owed. ⛔ The merge was not the proof; this run is.

Run `34209955709`, `main` push on `83d4fda16` — every job

Test (coverage shard 1/4)          success     ← the shard that was red
Test (coverage shard 2/4)          success
Test (coverage shard 3/4)          success
Test (coverage shard 4/4)          success
Test (coverage)                    success     ← ⭐ THE SENTINEL
Build & E2E                        success
Build Docs                         success
Type Check                         success
Changeset Fixed Group Check        success
Test (shard ${{ matrix.shard }}/4) skipped

⭐ Test (coverage) passing is the load-bearing row, ⛔ not the four green shards. That is the sentinel whose whole job is to distinguish "the gate ran and said no" from "the gate did not run", and for 84 consecutive push runs it had been reporting the second:

##[error]shards=failure blobs=skipped merge=skipped report=skipped —
no complete merged report was produced for … ,
so the coverage thresholds were never evaluated on this commit

⇒ It is now producing a merged report and evaluating the thresholds. The streak — 84 consecutive failures, last green 3c6394cb2 @ 2026-09-07T08:28:39Z, control 116 successes in the same 400-run window — is broken at 83d4fda16.

⚠️ The outcome that did NOT happen, recorded because it was named in advance

The prediction posted here before this run completed listed two outcomes, and the second was: still red ⇒ there is a second failure behind the one that was fixed. The dev flagged the specific candidate — Test (coverage shard 2/4) was red across much of the streak, including its first four runs where it was the only red shard, and it was never reproduced, so nobody had a name for it.

⇒ Shard 2/4 is green on this run. ⛔ That does not prove the shard-2 case is gone — it was intermittent by nature and one green run cannot retire an intermittent failure. What it does mean is that ⛔ no new card is owed today, and that if shard 2 reds again it is a new name to read, ⛔ not this card re-opened.

One correction to the LANDED note above

That note said "this card does not close on it". The card was already closed by Fixes #8479 at merge — the correct behaviour for ending A, where the failing test turned out to be in this lane and was fixed here. ⇒ The sentence was wrong about the card's state; what it was reaching for, and what stands, is that the merge was not the proof. This comment is that proof.

⭐ objectui#8380 records the same instance — same file, same assertion — filed weeks before anyone acted on it. It is fixed by 83d4fda16 and this reading applies to it too; ⛔ closing and grading it remain the triage seat's.

Generated by Claude Code

⛔ Skipped at candidate selection for the third time — this card is graded p1 and sits at the head of the lane's queue, and it is already fixed. domain:devx @ objectui execution seat, PM session session_01FhBNJcLRZLe8M87VcUgpKr, R47, 2026-09-08T15:35Z. ⛔ Not a re-raise and ⛔ not a grading — a request that triage close it.

The proof is already on this card (comment 5583597145): 83d4fda16 landed the repair, and main's CI run 34209955709 came back completed/success with all four coverage shards and the Test (coverage) sentinel green — the first evaluated coverage gate since 2026-09-07T08:28:39Z.

Why one more comment is worth it

⭐ priority:p1 + pm:queue puts this card first in the type-Bug level of the lane's selection order. ⇒ Every enumeration this seat runs surfaces it at the top, and the premise check has now discarded it three times — 10:19Z, 13:17Z and 15:32Z. ⛔ The skip is correct, but it is a cost paid on every round, and a card that is fixed cannot be worked.

⚠️ The failure mode this creates is the one this repository keeps filing cards about: a queue whose head is permanently unworkable trains its reader to skip rather than to check. ⇒ Better to close it than to keep proving it.

⛔ What this seat will not do

⛔ Close it, ⛔ re-grade it, ⛔ attach it to a PR of its own — it carries finding and grading belongs to the triage seat. And this card's own recorded remedy (raise the per-test timeout) is not what PR #8543 did, so a reader closing it should know the fix took the other route: the whole-repository scan was hoisted to module scope, where no timeout governs it.

⇒ For triage: this is fixed by 83d4fda16. Verifying it is one command — the three this repository cases in scripts/__tests__/check-unused-dependencies.test.ts read a hoisted REPOSITORY_SCAN instead of each calling analyze(repoRoot).

Generated by Claude Code

Closing — the premise is falsified on `origin/main`: this was fixed by another card

domain:devx @ objectui execution seat, session session_01FhBNJcLRZLe8M87VcUgpKr, R51. Reading taken 2026-09-09T12:10Z against origin/main 0eaed83cf. This is the pre-dispatch premise check, run because this card was the highest-priority item in the lane (p1) and therefore first in the selection order — ⛔ not a drive-by close.

What the card asked for

scripts/__tests__/check-unused-dependencies.test.ts → "is green: every gated declaration has a consumer" runs a whole-repo analyze(repoRoot) scan inside a test that declares no per-test timeout, so it inherits testTimeout: 15000.

What the tree says now

83d4fda16 — "test(scripts): hoist the whole-repository scan out of check-unused-dependencies' timed window (#8543)" — landed for objectui#8479 and did exactly this:

scripts/__tests__/check-unused-dependencies.test.ts:396
const REPOSITORY_SCAN = analyze(repoRoot);        ← module scope, outside every timed window

and all three describe('this repository') tests now read it rather than scanning:

:399  it('is green: every gated declaration has a consumer', …)   → const { findings } = REPOSITORY_SCAN;
:416  it('scans a population big enough …', …)                    → const { counters } = REPOSITORY_SCAN;
:423  it('keeps the non-gated fields VISIBLE …', …)               → const { measured } = REPOSITORY_SCAN;

⇒ the named test no longer performs the whole-repo scan at all, so the 15 s testTimeout cannot reach it.

Controls, because a clean reading needs them

Firing control: the same analyze( grep still returns 5 hits in the file, so the query is live rather than dead. The three that remain inside test bodies — :113, :282, :367 — take a fixture root, ⛔ not repoRoot: they walk small synthetic trees, which is not this card's subject.
Nonsense control: a fabricated symbol returns 0, exit 1.

Disposition

Closed as completed — the defect is gone from the tree and the fix is attributable to a specific commit. ⛔ Not not_planned: this was a real defect that was really repaired, just not here. pm:queue stripped in the same write; domain:devx, bug, priority:p1 and the type labels stay, because ownership is not state.

⚠️ The class this belonged to is still open and is NOT closed by this. objectui#8545 records the shape — two whole-corpus walks crossed the 15 s window twelve hours apart, each time green on every PR and red on every push, and the second held main's coverage gate unevaluated for 84 consecutive runs. Repairing the two known instances does not stop the third. ⇒ read #8545 for the structural half; ⛔ do not read this close-out as the class being handled.

Generated by Claude Code

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finding(tests): `check-unused-dependencies.test.ts` whole-repo scan flakes on the 15s default `testTimeout` under container load #8380

What was measured

Why it is worth recording

Suggested shape of a fix

What it turned into

⚠️ One note on this card's suggested remedy, ⛔ not a criticism of the card

What this seat is and is not doing

分诊路由 — `domain:devx` · `pm:queue` · `priority:p1` · type Bug

⭐⭐ 定级 p1 —— 因为这张卡就是 #8479 追了 84 次红推送的那个根因

⭐⭐ 机制比「容器负载」精确得多 —— 这才是它没被修掉的原因

⚠️ 本卡建议的修法没有被采纳，而这是对的 —— 本席明确背书

状态 —— `pm:queue`，⚠️ 但很可能由 PR #8543 直接修好

与三张邻卡的关系 —— 四张卡，一条链

车道 — `domain:devx`

type = Bug

Run `34209955709`, `main` push on `83d4fda16` — every job

⚠️ The outcome that did NOT happen, recorded because it was named in advance

One correction to the LANDED note above

Why one more comment is worth it

⛔ What this seat will not do

Closing — the premise is falsified on `origin/main`: this was fixed by another card

What the card asked for

What the tree says now

Controls, because a clean reading needs them

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finding(tests): check-unused-dependencies.test.ts whole-repo scan flakes on the 15s default testTimeout under container load #8380

Description

What was measured

Why it is worth recording

Suggested shape of a fix

Activity

claude commented on Sep 8, 2026

What it turned into

⚠️ One note on this card's suggested remedy, ⛔ not a criticism of the card

What this seat is and is not doing

os-zhuang commented on Sep 8, 2026

分诊路由 — domain:devx · pm:queue · priority:p1 · type Bug

⭐⭐ 定级 p1 —— 因为这张卡就是 #8479 追了 84 次红推送的那个根因

⭐⭐ 机制比「容器负载」精确得多 —— 这才是它没被修掉的原因

⚠️ 本卡建议的修法没有被采纳，而这是对的 —— 本席明确背书

状态 —— pm:queue，⚠️ 但很可能由 PR #8543 直接修好

与三张邻卡的关系 —— 四张卡，一条链

车道 — domain:devx

type = Bug

claude commented on Sep 8, 2026

Run 34209955709, main push on 83d4fda16 — every job

⚠️ The outcome that did NOT happen, recorded because it was named in advance

One correction to the LANDED note above

claude commented on Sep 8, 2026

Why one more comment is worth it

⛔ What this seat will not do

claude commented on Sep 9, 2026

Closing — the premise is falsified on origin/main: this was fixed by another card

What the card asked for

What the tree says now

Controls, because a clean reading needs them

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finding(tests): `check-unused-dependencies.test.ts` whole-repo scan flakes on the 15s default `testTimeout` under container load #8380

分诊路由 — `domain:devx` · `pm:queue` · `priority:p1` · type Bug

状态 —— `pm:queue`，⚠️ 但很可能由 PR #8543 直接修好

车道 — `domain:devx`

Run `34209955709`, `main` push on `83d4fda16` — every job

Closing — the premise is falsified on `origin/main`: this was fixed by another card