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Vance Ingalls
cc9403b6bd
## Summary Extract the `frameDirMaxIndexCache` from a private module-scoped Map inside `renderOrchestrator.ts` into its own `frameDirCache.ts` module, then add a 11-test bun:test suite that pins the cross-job isolation contract added in Chunk 5B. ## Why `Chunk 9E` of `plans/hdr-followups.md`. The cache lived as a private Map inside `renderOrchestrator.ts`, which made the cross-job isolation contract from Chunk 5B impossible to unit-test directly. Extracting it both makes the contract testable and reduces orchestrator complexity slightly. ## What changed - New `packages/producer/src/services/frameDirCache.ts` exposes `getMaxFrameIndex` / `clearMaxFrameIndex` / `getMaxFrameIndexCacheSize` (plus a test-only `__resetMaxFrameIndexCacheForTests` helper). Behavior is unchanged: callers still get the same module-scoped sharing inside a job, and `renderOrchestrator`'s outer `finally` still clears every entry it registered so the cache cannot grow monotonically across renders. - `renderOrchestrator.ts`: imports the new helpers, drops the unused `readdirSync` import, updates inline comments, and replaces two `frameDirMaxIndexCache.delete` sites with `clearMaxFrameIndex`. - New `frameDirCache.test.ts` (bun:test, 11 tests) covering: - Reading the max index from a populated directory. - Ignoring filenames that don't match `frame_NNNN.png` (wrong ext, wrong prefix, wrong case, double extension, empty index group, same-named subdirectory). - Empty- and missing-directory paths returning `0` and being cached. - Intra-job invariant: subsequent readdir mutations not observed once cached. - `clearMaxFrameIndex` forcing a re-read; returns `false` for paths that were never cached. - Per-directory isolation when multiple directories are registered. - The cross-job contract from Chunk 5B: cache empty between well-behaved jobs, doesn't grow monotonically across 20 simulated renders with 3 HDR videos each (steady-state cache size stays at 3), and a buggy job that forgets to clear leaks exactly its own entries rather than affecting unrelated jobs. ## Test plan - [x] `frameDirCache.test.ts` 11/11 pass. - [x] Existing producer tests unchanged. - [x] Behavior preserved: same module-scoped sharing inside a job, same outer-`finally` eviction. ## Stack Chunk 9E of `plans/hdr-followups.md`. Test-driven extraction; complements Chunk 5B.