111 of 122 top-level src/utils/ files move into 16 topic folders (audio,
cache, cover, share, server, playback, playlist, deviceSync, waveform,
mix, format, export, changelog, ui, perf, componentHelpers). True
singletons with no cluster stay at the utils/ root.
Pure file-move: a path-aware codemod rewrote 539 relative-import
specifiers across 275 files; no logic touched. The hot-path coverage
gate list (.github/frontend-hot-path-files.txt) is updated to the new
paths for the 11 gated utils files — a mechanical consequence of the
move, not a CI change. tsc is green.
Three domain-eng modules peel ~316 LOC of fetch/mapping out of
`api/subsonic.ts`:
- `subsonicLibrary.ts` — browse + random + per-song fetch
(`getMusicDirectory`, `getMusicIndexes`, `getMusicFolders`,
`getRandomAlbums`, `getAlbumList`, `getRandomSongs`,
`getRandomSongsFiltered`, `getSong`, `getAlbum`,
`filterSongsToActiveLibrary`, `similarSongsRequestCount`, plus
the private `albumIdsInActiveLibraryScope` cache).
- `subsonicArtists.ts` — artist endpoints (`getArtists`, `getArtist`,
`getArtistInfo`, `getTopSongs`, `getSimilarSongs2`,
`getSimilarSongs`). Uses Library's `filterSongsToActiveLibrary` and
`similarSongsRequestCount` for the per-library scoping fallback.
- `subsonicRatings.ts` — `parseSubsonicEntityStarRating` parser plus
`prefetchArtistUserRatings` and `prefetchAlbumUserRatings` workers
with the shared 7-min cache. Calls back into Library/Artists for
the per-id fetch.
51 external call sites migrated to direct imports. No re-export
shims in `subsonic.ts`. Statistics endpoints still in `subsonic.ts`
keep their `RATING_CACHE_TTL` constant locally (same 7-min window).
subsonic.ts: 1078 → 762 LOC (−316).
Move the ~180-LOC `next` action body into `runNext(set, get, manual)`
in `src/store/nextAction.ts`, following the helper-with-thin-wrapper
pattern from E.37–E.39.
Covers all three top-level outcomes:
- Has next slot → playTrack + proactive infinite-queue / radio top-up
when ≤ 2 of each remain ahead. Both top-ups skipped inside an
Orbit session (host owns the queue).
- Queue exhausted, repeat=all → wrap to index 0.
- Queue exhausted, repeat=off → stop, unless radio-flagged or
infinite queue is enabled (each fetches a fresh batch + continues),
or an Orbit session is active (stop locally, let useOrbitGuest sync).
Pure code-move. playerStore.ts: 702 → 515 LOC (−187).
Frank Stellmacher