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.
Two-cut cluster on PlaylistDetail.tsx. 1400 → 1199 LOC (−201). Both
JSX islands lift out cleanly — they own no playlist-level state, they
just consume props plus their own store subscriptions.
PlaylistSongSearchPanel — the song-search overlay that opens behind
the "Add songs" button. Owns its render only; query / results /
selection / playlist-picker-open / context-menu-id all stay as state
in PlaylistDetail (the debounced search useEffect still drives them).
The component pulls `openContextMenu` from playerStore directly so
the parent doesn't have to wire it through. PlaylistSearchResultThumb
moves inline with the new file — it has no other consumers.
PlaylistSuggestions — the discover-more strip rendered below the
tracklist. Subscribes to playerStore (openContextMenu + the
play-next inline action), previewStore (previewingId +
audioStarted), themeStore (showBitrate), and react-router
(navigate). Existing-id filter, hovered-id highlight, contextMenuId
and the load-more callback come in as props from the page.
PL_CENTERED is duplicated in the component because the tracklist
header inside PlaylistDetail still references it; dedup is a
follow-up once the tracklist itself is extracted.
PlaylistDetail's import list drops PlaylistSearchResultThumb (now
unused locally) and picks up the two component imports. Pure code
move otherwise — no behaviour change.
Frank Stellmacher