The mm:ss track-time formatter was hand-rolled in 11 places and the
h:mm:ss total-duration formatter in 4 — extract two tested functions:
- formatTrackTime(seconds, fallback='0:00') — m:ss, used for track /
playback times. fallback param covers the '–' placeholder rows.
- formatLongDuration(seconds) — h:mm:ss when >=1h, else
m:ss, used for album / queue totals.
Behaviour preserved per call site: the unified guard
(!seconds || !isFinite || <0 -> fallback) produces identical output to
every prior variant for all real inputs; SongRow keeps its '–' via the
fallback arg. Removes the formatter exports from 6 componentHelpers
files (playerBarHelpers / fullscreenPlayerHelpers deleted — they only
exported the formatter) and 7 inline component copies.
+ formatDuration.test.ts
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.
* refactor(fullscreen-player): H5 — extract FsLyricsApple + FsLyricsRail + useWordLyricsSync
The two lyrics views become own files under components/fullscreenPlayer/.
Their identical word-sync imperative DOM-update useEffect (only differing in
the .fsa-/.fsr- class prefix) collapses into the shared useWordLyricsSync
hook with a classPrefix arg.
FullscreenPlayer.tsx: 911 → 613 LOC.
* refactor(fullscreen-player): H5 — extract FsArt + FsPortrait + FsSeekbar
The three visual subcomponents move into own files. formatTime moves into
utils/fullscreenPlayerHelpers.ts so FsSeekbar keeps using it.
FullscreenPlayer.tsx: 613 → 421 LOC.
* refactor(fullscreen-player): H5 — extract FsLyricsMenu + FsPlayBtn
The lyrics-settings popover and the isolated play/pause button move into
own files. FullscreenPlayer drops the now-unused lucide-react icons
(Play/Pause/Moon/Sunrise/Music) and the PlaybackDelayModal +
PlaybackScheduleBadge imports — both used only by FsPlayBtn now.
FullscreenPlayer.tsx: 421 → 304 LOC.
* refactor(fullscreen-player): H5 — extract useFsDynamicAccent + useFsArtistPortrait + useFsIdleFade
Pulls three state+effect islands out of FullscreenPlayer:
- useFsDynamicAccent owns the cover-blob fetch + extractCoverColors call
plus the module-level artKey → accent cache that makes same-album song
switches instant.
- useFsArtistPortrait fetches getArtistInfo().largeImageUrl for the right-
side portrait, returning '' until resolved (or when no artistId).
- useFsIdleFade flips isIdle true after 3 s of inactivity, exposes a
throttled mousemove handler, and binds Escape to the provided callback.
FullscreenPlayer.tsx: 304 → 228 LOC.
Frank Stellmacher