[lidge-jun]

Summary

tests/codex-integration/codex-write-lock.test.ts failed twice on dev (ci.yml lane=all run 35953803435, windows 1/9, attempts 1 and 2) with the same error: one OS user and one home take ONE lock, case 0 timed out after 15000 ms waiting for the holder child's marker, with the child still running. No product code changed; #5730 added a test file, which shifted this file to the front of its batch on that shard.

The cause is in the fixture. The home-environment cases give each child a brand-new fake HOME/USERPROFILE, and Bun keeps its runtime transpiler cache under the user's home cache directory unless BUN_RUNTIME_TRANSPILER_CACHE_PATH is set: HOME on macOS/Linux and USERPROFILE on Windows (Bun 1.4.0). A child started with a fresh home writes a new @t@ cache (261 files, 4.1 MB, measured on macOS), so every holder in those cases re-transpiled the whole lock graph, and the describe's beforeAll warm-up did not help. The Windows logs show the split: in the same describe, children with the ambient home booted in 1.2-3.7 s, while the fake-home cases took 5-19 s.

This PR pins BUN_RUNTIME_TRANSPILER_CACHE_PATH to one per-process temp directory for the warm-up and for every child in the describe, and removes it in afterAll. The explicit override takes precedence on every platform. The lock identity under test is derived only from HOME/USERPROFILE, so every assertion is unchanged and no budget is raised.

Verification

• Probe: a fresh HOME without the pin created 261 cache files under it; two fresh homes with the pin created none (all 261 went to the shared directory).

• bun test tests/codex-integration/codex-write-lock.test.ts: 20 pass, 0 fail (case 0/1/2 in about 0.3 s each on macOS); the shared cache directory is removed afterwards.

• bun run typecheck: pass.

• The Windows proof is ci.yml lane=all on dev after merge (the owner verifies on dev).

• Review: gpt-6-sol adversarial review NEAR-PASS (assertions unchanged; cache sharing and cleanup sound; Windows cache-home precision folded into the comment and this description).

Checklist

• Scope stays focused and avoids unrelated cleanup.
• Docs or release notes were updated when needed.
• Security-sensitive changes were reviewed for secrets, auth, and unsafe defaults.

[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-24T04:44:55.615138Z	edbaa81	PR opened

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ℹ️ Recent review info

⚙️ Run configuration

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Run ID: a942ba1f-c276-45f7-854f-a7d5f019bcc5

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• tests/codex-integration/codex-write-lock.test.ts

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📝 Walkthrough

Walkthrough

The lock integration test now uses a temporary shared transpiler cache for spawned child processes. It warms the cache before the tests and removes it afterward.

Changes

Lock test cache

Layer / File(s)	Summary
Cache setup and child spawning tests/codex-integration/codex-write-lock.test.ts	The test creates a temporary transpiler cache, warms the child module graph, and passes the cache path to both child-spawning helpers. An afterAll hook removes the cache.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Other

Merge Risk: ⚪ Minimal · up to edbaa

The cache change appears mergeable after normal checks. Windows verification remains planned, but the supplied evidence does not establish a failure that should block merging.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 2 functions across 1 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the change: the test now shares one Bun transpiler cache across write-lock child processes. It is concise, specific, and directly matches the pull request changes.

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