SubMiner/backlog/tasks/task-71 - Split-main.ts-into-domain-runtime-modules-round-2.md

id, title, status, assignee, created_date, updated_date, labels, dependencies, priority

id	title	status	assignee	created_date	updated_date	labels	dependencies	priority
TASK-71	Split main.ts into domain runtime modules round 2	Done	codex	2026-02-18 11:35	2026-02-21 04:57	architecture refactor maintainability		high

Description

src/main.ts remains >3k LOC and still mixes composition, runtime state mutation, domain workflows (Jellyfin, AniList), tray/UI setup, and IPC wiring. This creates high cognitive load and broad change blast radius.

Progress Notes

• Added runtime domain barrels under src/main/runtime/domains/* and composed registry entrypoint at src/main/runtime/registry.ts.
• Migrated src/main.ts runtime imports from per-file runtime modules to domain barrel import paths.
• Added scripts/check-main-runtime-fanin.ts guardrail and package scripts (check:main-fanin, check:main-fanin:strict).
• 2026-02-21: extracted jellyfin/anilist deps-builder clusters into composer modules (src/main/runtime/composers/jellyfin-remote-composer.ts, src/main/runtime/composers/anilist-setup-composer.ts) and replaced inline main.ts orchestration with composer invocations.
• 2026-02-21: tightened fan-in guard defaults to import lines <= 110 and unique runtime paths <= 11; strict mode passing.
• Remaining TASK-71 scope: finish startup/overlay/ipc/shortcuts composer extraction to fully thin src/main.ts.

Action Steps

1. Extract cohesive runtime modules:
   • AniList runtime orchestration
   • Jellyfin runtime orchestration
   • tray runtime
   • MPV event binding/runtime hooks
2. Keep main.ts as composition root only (state wiring + module registration).
3. Define narrow service/deps interfaces per module to reduce closure capture.
4. Add/adjust unit tests for extracted modules.
5. Preserve existing CLI/IPC behavior exactly.
6. Update architecture docs with new ownership boundaries.

Acceptance Criteria

• #1 src/main.ts responsibilities reduced to composition/wiring concerns
• #2 Extracted runtime modules have focused interfaces and isolated tests
• #3 No CLI/IPC regressions in existing test suite
• #4 Docs reflect new module boundaries

Implementation Plan

1. Extract AniList tracking composition from src/main.ts (refresh/guess/probe/retry/update handler assembly) into src/main/runtime/composers/anilist-tracking-composer.ts with focused seam tests.
2. Extract MPV runtime composition from src/main.ts (bind event handlers, MPV client factory, subtitle render metrics, tokenizer warmups) into src/main/runtime/composers/mpv-runtime-composer.ts with focused seam tests.
3. Rewire src/main.ts to consume both composers while preserving existing local helper contracts and downstream behavior.
4. Update architecture docs to reflect composition boundary under src/main/runtime/composers/*.
5. Run verification gate (build + check:main-fanin + test:core:dist), then record TASK-71 notes/AC/DoD and finalize if green.

Implementation Notes

2026-02-21: extracted two remaining high-noise main-process composition clusters from src/main.ts into dedicated runtime composers: src/main/runtime/composers/anilist-tracking-composer.ts (AniList media tracking/probe/retry/update assembly) and src/main/runtime/composers/mpv-runtime-composer.ts (MPV event binding/factory/metrics/tokenizer/warmups assembly).

Rewired src/main.ts to consume composer outputs while preserving existing helper contracts/call sites (refreshAnilistClientSecretState, processNextAnilistRetryUpdate, maybeRunAnilistPostWatchUpdate, createMpvClientRuntimeService, updateMpvSubtitleRenderMetrics, tokenizeSubtitle, startBackgroundWarmups).

Added focused seam tests: src/main/runtime/composers/anilist-tracking-composer.test.ts and src/main/runtime/composers/mpv-runtime-composer.test.ts.

Added src/main/runtime/composers/index.ts barrel and updated main imports to keep runtime fan-in strict gate green.

Docs updated for new boundaries in docs/architecture.md and docs/development.md.

Verification: bun run build, bun test src/main/runtime/composers/anilist-tracking-composer.test.ts src/main/runtime/composers/mpv-runtime-composer.test.ts, bun run check:main-fanin:strict (85 import lines / 10 unique runtime paths, pass), and bun run test:fast (pass).

src/main.ts LOC reduced from 2956 to 2875 in this pass.

Final Summary

Completed TASK-71 round 2 by extracting AniList tracking and MPV runtime assembly clusters out of src/main.ts into dedicated composer modules with focused seam tests, then rewiring the composition root to consume those modules without changing runtime behavior. Added a composers barrel to reduce runtime import fan-in and updated architecture/development docs to reflect composer-first boundaries; verification gates (build, check:main-fanin:strict, composer tests, test:fast) all pass.

Definition of Done

• #1 bun run test:fast passes
• #2 Architecture docs updated