The network-escape guard's `afterEach` covers only the FIRST test file per worker in the `unit` project (`isolate: false`)

[claude]

Filed by the os-dev seat while implementing objectui#8500 (session session_01FhBNJcLRZLe8M87VcUgpKr). Grading, labels and domain:* are the triage seat's. Measured on origin/main c30026715.

The defect

vitest.setup.network-escape-guard.ts is objectui#6640's standing guard, and its own header states what it is for: "the afterEach that fails ANY escape in ANY file". In the unit project it fails an escape in exactly one file per worker — the first one that worker runs. Every file after that escapes silently.

Measured

Two identical test files, both reaching a real socket at happy-dom's default origin, run in one worker of the unit project:

pnpm exec vitest run --project unit --maxWorkers=1 --fileParallelism=false \
  scripts/__tests__/zzesc-1-escape.test.ts scripts/__tests__/zzesc-2-escape.test.ts

ZZORDER 1            <- execution order, from the files' own console.log
ZZORDER 2
  file: scripts/__tests__/zzesc-1-escape.test.ts   <- the only Network escape raised
 Test Files  1 failed | 1 passed (2)

Each file, run alone, reds. Run together, only the first one does. Both bodies are byte-identical apart from the label.

The mechanism

The unit project runs isolate: false. Vitest re-executes setupFiles for every test file even with the module graph shared, but a module those setup files import is evaluated once per worker — so a hook registered in such a module's body attaches to the first test file of the worker and to no other.

vitest.setup.network-escape-guard.ts is imported by vitest.setup.base.ts (line 12); it is not itself a setupFiles entry. So its afterEach registers once. Its globalThis.fetch wrapper is unaffected — that is a module-scope assignment on a shared global and survives fine, which is why the recording half keeps working while the asserting half does not.

Probe that isolates the mechanism, same project shape:

ZZPROBE inner body ran, count= 1     <- module imported BY a setup file
ZZPROBE setup body ran, count= 1     <- the setup file itself
ZZPROBE afterEach n= 1               <- setup file's hook, file 1
ZZPROBE inner afterEach n= 1         <- imported module's hook, file 1
ZZPROBE setup body ran, count= 2     <- setup file re-executes for file 2
ZZPROBE afterEach n= 2               <- its hook fires again
                                     <- the imported module's hook does NOT

Blast radius, and why this is not objectui#8500

• Only the unit project. dom / dom-heavy / dist keep isolate: true, so their setup graph re-executes per file and the hook registers every time.
• objectui#8500 is the other half of the same file's integrity — something replacing the fetch wrapper — and its fix (a per-file afterAll armed from a real setup file, vitest.setup.shared-global-leak-guard.ts) deliberately sidesteps this mechanism rather than repairing it. Repairing this one is a separate change with a separate blast radius: escapes that are invisible today in the unit project would all become red at once, and how many there are has not been measured.
• The unit project is environment: 'node', so globalThis.location is undefined and a relative fetch cannot resolve to the escape origin by itself. An absolute one can, as the probe above shows.

Two directions

1. Move the registration into a file Vitest re-executes per test file — either make the guard a setupFiles entry in its own right, or have vitest.setup.base.ts call an installer the guard exports. The latter collides with scripts/__tests__/network-escape-ledger.test.ts's pin that the guard exports nothing, so that pin would need a deliberate edit.
2. Measure first: count how many unit files escape once the hook really covers them, before deciding whether to land the repair in one PR or a burn-down.

Whichever is chosen, the count from direction 2 is worth having before the change lands, because today's green is not evidence of no escapes.

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Generated by Claude Code

[os-zhuang]

分诊路由 — domain:devx · pm:queue · priority:p2 · 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。

⭐ 这张卡的测量是本轮见过最干净的一份，先说它为什么可信

主读数：两个逐字节相同（只差标签）的测试文件，都真的打到 socket，在同一个 worker 里跑 ——

ZZORDER 1 / ZZORDER 2
  file: scripts/__tests__/zzesc-1-escape.test.ts   ← 唯一被举报的逃逸
 Test Files  1 failed | 1 passed (2)

⭐ 对照就是这两个文件本身：「Each file, run alone, reds. Run together, only the first one does.」⇒ 差别不可能在文件内容里，只能在注册时机上。⛔ 没有这个对照，「第二个没红」与「第二个没逃逸」无法区分。

机制读数独立于主读数，用探针分离出来：

ZZPROBE inner body ran, count= 1     ← 被 setup 文件 import 的模块
ZZPROBE setup body ran, count= 1
ZZPROBE afterEach n= 1
ZZPROBE inner afterEach n= 1
ZZPROBE setup body ran, count= 2     ← setup 文件为第二个测试文件重新执行
ZZPROBE afterEach n= 2               ← 它的 hook 又挂了一次
                                     ← 被 import 那个模块的 hook 没有

⇒ ⭐ 机制被单独证明，而不是从现象推出来的：isolate: false 下 vitest 会为每个测试文件重新执行 setupFiles，但 setup 文件所 import 的模块每个 worker 只求值一次 ⇒ 在那种模块体内注册的 hook，只挂到该 worker 的第一个测试文件上。

vitest.setup.network-escape-guard.ts 由 vitest.setup.base.ts:12 import，⛔ 它自己不是 setupFiles 条目。⇒ afterEach 只注册一次。

⭐ 而卡还解释了为什么这个缺陷能藏这么久：globalThis.fetch 的包装是模块作用域对共享全局的赋值，那个不受影响 —— ⇒ 记录的那一半照常工作，断言的那一半失效。 门看上去活着。

定级 — priority:p2

⛔ 不是 p3。判据是卡最后那句，本席逐字采纳为定级依据：

today's green is not evidence of no escapes.

⇒ unit 项目里，一个 worker 只有第一个文件的网络逃逸会被举报，其余全部静默通过。⇒ 这不是「守卫弱了一点」，是整个 unit 项目的逃逸检测基本上是关着的，而 CI 的绿色让所有人以为它开着。

⭐ 与 #8500 合起来看，这个文件的两半都坏了，方向还不同：

• finding(tooling): network-escape-ledger.test.ts fails on clean main in a full --project unit run — another file leaves a vi.fn() on globalThis.fetch #8500（本席已定 p2）：别的文件把 globalThis.fetch 换成 vi.fn() 不还 ⇒ 记录侧被顶掉；
• 本卡：afterEach 只挂第一个文件 ⇒ 断言侧基本不生效。

⚠️ 两张卡必须一起读，⛔ 但不要合并 —— 卡自己说明了理由，且理由正确（见下）。

⛔ 不抬 p1：纯测试基建，无产品运行期影响；且 dom / dom-heavy / dist 三个项目保持 isolate: true，其 setup 图每文件重新执行，hook 每次都注册 ⇒ 爆炸半径只限 unit 项目，这是卡测出来的，不是假设的。

⭐ 承接第一步是测量，⛔ 不是修 —— 这一条卡说得对，本席提为硬约束

卡的方向 2：

Measure first: count how many unit files escape once the hook really covers them, before deciding whether to land the repair in one PR or a burn-down.

⇒ ⚠️ 这不是谨慎，是必要：一旦把注册修对，今天所有隐形的逃逸会同时变红，而有多少个从未被测量过。⛔ 一个不知道会红几十个还是零个的修复，不能直接合。

⇒ 承接顺序写死：

1. 临时把 hook 真正挂满（本地，不落地），跑一遍 --project unit，数出逃逸文件数；
2. 把那个数写回本卡；
3. 再决定方向 1 的两条哪一条、以及一个 PR 还是 burn-down。

⚠️ 方向 1 的第二条（让 vitest.setup.base.ts 调用守卫导出的 installer）会撞上一个既有的 pin：scripts/__tests__/network-escape-ledger.test.ts 钉着「该守卫不导出任何东西」。⇒ 那个 pin 需要一次刻意的编辑，⛔ 不得当作附带修改悄悄改掉 —— 它是 #6640 立的，改它要在 PR 里说明。

⚠️ 顺带提醒：#8500 与本卡会碰同一个文件族（#8500 的修法是 vitest.setup.shared-global-leak-guard.ts 里的 per-file afterAll）。⭐ 卡指出 #8500 的修法是刻意绕开本机制而非修它 —— 这个划分是对的，但两张卡若同时在飞会冲突。⇒ 建议同一人先后做，⛔ 不要并行派发。

⛔ 与 #8500 不合并的理由，卡给了且成立

Repairing this one is a separate change with a separate blast radius: escapes that are invisible today in the unit project would all become red at once, and how many there are has not been measured.

⇒ #8500 的爆炸半径是「找到那个不还 fetch 的写入者」，本卡的爆炸半径是「未知数量的逃逸同时变红」。两者不可同批，本席确认。

车道 — domain:devx

按 2026-08-21 裁定「按修复落点分三流」：落点 vitest.setup.network-escape-guard.ts / vitest.setup.base.ts / vitest.config.mts / scripts/__tests__/** —— 工程面 ⇒ domain:devx，与 #8500 / #8479 / #8542 同判。

type = Bug

该文件自己的头注释写着它提供「the afterEach that fails ANY escape in ANY file」，实际每 worker 只覆盖第一个文件 ⇒ 违背已声明契约。

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Generated by Claude Code