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Phase 39: Quality, Performance & Packaging

Summary

Final phase of Block 4 and the entire project roadmap. Closed test coverage gaps from Phases 34-36, virtualized event lists for large runs, typed analysis responses, and packaged the application for single-command startup via uv run python -m api and Docker.

Tests: 22 new (6 Python + 16 vitest), ~7,833 total (~7,561 Python + 272 vitest)

What Was Built

39a: Test Coverage Gaps

  • useBatchProgress tests (4 tests): null batchId, connect/open, parse messages, cleanup on unmount
  • useViewportControls tests (4 tests): initial defaults, zoom in/out, fitToExtent computation
  • RunDetailPage error states (2 tests): cancelled badge, multi-line traceback in <pre> block
  • Typed analysis responses: frontend/src/types/analysis.ts with CompareResult, SweepResult, MetricComparison, MetricStat, SweepPoint
  • API analysis functions: runCompare() and runSweep() return typed results instead of Record<string, unknown>
  • useAnalysis hooks: Updated mutation types from Record<string, unknown> to typed results
  • ComparisonCharts: Rewrote to use result.metrics array with grouped bar chart (mean ± std error bars) and statistical table (p-value, effect size, significance highlighting). Previous implementation was broken — accessed non-existent result.a/result.b fields.
  • SweepPanel: Fixed data extraction from Object.entries(sweep.data) (iterated SweepResult fields) to sweep.data.points.map(...) (iterates sweep data points)
  • Event type constants: Exported DESTRUCTION_EVENTS, REINFORCEMENT_EVENTS, ENGAGEMENT_EVENTS, MORALE_EVENTS from eventProcessing.ts
  • RunDetailPage: Error messages wrapped in <pre> for traceback formatting

39b: Performance

  • Configurable frame capture interval: RunSubmitRequest.frame_interval field (default None = auto ~500 frames). Passed through submit() -> _execute_run() -> _run_sync().
  • Virtualized event list: @tanstack/react-virtual for EventsTab — renders only visible rows in a scrollable container. Pagination still works for data fetching. Fixed header stays above scroll area.

39c: Startup & Packaging

  • api/__main__.py: Enables uv run python -m api single-command startup
  • Static file serving: create_app() detects frontend/dist/ and mounts /assets + SPA fallback catch-all route. API routes take precedence (registered first).
  • Dev scripts: scripts/dev.sh (bash) and scripts/dev.ps1 (PowerShell) start both API and frontend dev servers with cleanup on exit
  • Docker: Multi-stage Dockerfile (Node 22 alpine frontend build + Python 3.12 slim + uv). .dockerignore excludes dev files.
  • README Quick Start: Added development, production, and Docker startup instructions

39d: Minor Polish

  • Terrain types from enum: GET /api/meta/terrain-types returns LandCover enum member names instead of hardcoded list
  • ConfigDiff component: Recursive diff view in scenario editor showing field: oldValue -> newValue entries. Collapsible Headless UI Disclosure panel.

Design Decisions

  1. Virtualizer in jsdom: @tanstack/react-virtual requires non-zero scroll element dimensions. Tests mock HTMLElement.prototype.offsetHeight/scrollHeight for the virtualizer to render items.
  2. SPA fallback ordering: API routers are included before the catch-all /{full_path:path} route, ensuring /api/* always takes precedence.
  3. Frame interval passthrough: Added as optional parameter through 4 layers: schema -> router -> manager.submit -> _execute_run -> _run_sync. No breaking changes (default None preserves existing auto-calculation).

Files Changed

Action File Sub-phase
NEW frontend/src/__tests__/hooks/useBatchProgress.test.ts 39a
NEW frontend/src/__tests__/hooks/useViewportControls.test.ts 39a
NEW frontend/src/__tests__/pages/RunDetailPage.error.test.tsx 39a
NEW frontend/src/types/analysis.ts 39a
NEW frontend/src/__tests__/tabs/EventsTab.test.tsx 39b
NEW frontend/src/__tests__/pages/editor/ConfigDiff.test.tsx 39d
NEW frontend/src/pages/editor/ConfigDiff.tsx 39d
NEW api/__main__.py 39c
NEW scripts/dev.sh 39c
NEW scripts/dev.ps1 39c
NEW Dockerfile 39c
NEW .dockerignore 39c
NEW tests/api/test_phase_39_packaging.py 39b/39c/39d
MODIFY frontend/src/api/analysis.ts 39a
MODIFY frontend/src/hooks/useAnalysis.ts 39a
MODIFY frontend/src/lib/eventProcessing.ts 39a
MODIFY frontend/src/pages/runs/RunDetailPage.tsx 39a
MODIFY frontend/src/components/charts/ComparisonCharts.tsx 39a
MODIFY frontend/src/pages/analysis/SweepPanel.tsx 39a
MODIFY frontend/src/pages/runs/tabs/EventsTab.tsx 39b
MODIFY frontend/src/__tests__/pages/EventsTab.test.tsx 39b
MODIFY frontend/package.json + lock 39b
MODIFY api/schemas.py 39b
MODIFY api/run_manager.py 39b
MODIFY api/routers/runs.py 39b
MODIFY api/main.py 39c
MODIFY api/routers/meta.py 39d
MODIFY frontend/src/pages/editor/ScenarioEditorPage.tsx 39d
MODIFY README.md 39c

Deficit Resolution

Deficit Origin Resolved
useBatchProgress no dedicated test Phase 34 39a
RunDetailPage tests don't cover error states Phase 34 39a
Analysis API responses untyped Phase 34 39a
Hardcoded morale/event strings Phase 34 39a
useViewportControls no dedicated test Phase 35 39a
Frame capture interval not configurable Phase 35 39b
GET /api/meta/terrain-types hardcoded Phase 32 39d

Known Limitations

  • Docker image not tested on CI (no Docker in dev environment)
  • scripts/dev.ps1 uses Start-Process -NoNewWindow which may not propagate signals cleanly on all Windows versions
  • Virtualizer row heights are estimated at 40px — very long event data may overflow

Lessons Learned

  • @tanstack/react-virtual needs real DOM dimensions to determine visible range — jsdom returns 0 for all layout properties. Must mock offsetHeight/scrollHeight on HTMLElement.prototype.
  • TypeScript interfaces with explicit fields can't be assigned to Record<string, unknown> — the index signature is missing. When tightening types from Record<string, unknown> to a concrete interface, must update all consumers in the chain (hooks, components, tests).
  • SPA fallback route ordering in FastAPI: routes registered via include_router() take precedence over later @app.get() catch-all routes, so API routes naturally win.

Postmortem

1. Delivered vs Planned

All planned items delivered: 39a (test gaps, typed responses, event constants), 39b (frame interval, virtualized events), 39c (__main__, SPA, Docker, dev scripts, README), 39d (terrain enum, ConfigDiff). Two unplanned fixes discovered and resolved during postmortem (ComparisonCharts rewrite, SweepPanel data fix). Scope well-calibrated — no items dropped or deferred.

2. Integration Audit

  • All new files are imported/used: types/analysis.ts imported by api/analysis.ts, useAnalysis.ts, ComparisonCharts.tsx; ConfigDiff.tsx imported by ScenarioEditorPage.tsx; exported event constants available to consumers; api/__main__.py enables python -m api.
  • Pre-existing bugs found and fixed: ComparisonCharts accessed non-existent result.a/result.b — rewrote to use result.metrics array with proper bar chart + statistical table. SweepPanel used Object.entries(sweep.data) iterating SweepResult fields — fixed to use sweep.data.points.map(...).
  • No dead modules. No orphaned imports.

3. Test Quality Review

  • Coverage: Mix of unit (vitest component tests) and integration (Python API tests via httpx TestClient). Edge cases covered: null batchId, empty metrics, cancelled/failed states.
  • Realistic data: Tests use scenario-representative mock data (metric names, p-values, effect sizes).
  • jsdom limitation: Virtualizer tests require offsetHeight/scrollHeight mocks — test setup documents this clearly.
  • No implementation-detail tests: All tests verify behavior (rendered output, API responses), not internal state.

4. API Surface Check

  • Type hints on all new public functions. ConfigDiff props properly typed.
  • frame_interval parameter properly typed as int | None through all layers.
  • No functions that should be private but aren't.

5. Deficit Discovery

No new deficits introduced. 7 pre-existing deficits resolved. 2 pre-existing bugs found and fixed (ComparisonCharts, SweepPanel) that were not tracked as formal deficits.

6. Documentation Freshness

  • CLAUDE.md: Phase 39 status updated, test counts accurate
  • README.md: Badges, phase table, Quick Start section all current
  • MEMORY.md: Status and phase summary table updated
  • devlog/index.md: Phase 39 complete, 7 deficits marked resolved
  • development-phases-block4.md: Phase 39 marked COMPLETE
  • docs/index.md: Test count badge updated
  • mkdocs.yml: Phase 39 devlog in nav

7. Performance Sanity

Python test suite: ~142s. No regression from Phase 38 (~140s). Frontend vitest: ~14s. No performance concerns.

8. Summary

  • Scope: On target (all planned items + 2 bonus bug fixes)
  • Quality: High — typed interfaces catch errors at compile time, virtualized rendering handles large datasets
  • Integration: Fully wired — no gaps found
  • Deficits: 0 new, 7 resolved, 2 pre-existing bugs fixed
  • Action items: None — ready for final commit