yonlu
6ce0661fca
Archive milestone artifacts: - milestones/v1.0-ROADMAP.md (full roadmap archive) - milestones/v1.0-REQUIREMENTS.md (26/26 requirements complete) - milestones/v1.0-phases/ (8 phase directories with plans, summaries, verifications) Updated: - PROJECT.md: full evolution review, all consolidation requirements validated - ROADMAP.md: collapsed to milestone summary with archive link - STATE.md: reset for next milestone - MILESTONES.md: created with stats and accomplishments - RETROSPECTIVE.md: created with lessons learned Deleted: - REQUIREMENTS.md (archived, fresh for next milestone) 8 phases, 17 plans, 34 tasks, 84 tests added, 6 days
158 lines
14 KiB
Markdown
158 lines
14 KiB
Markdown
---
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phase: 08-frontend-performance-ux
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verified: 2026-03-05T15:30:00Z
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status: passed
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score: 8/8 must-haves verified
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human_verification:
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- test: "Scroll through a 10k+ track library — verify smooth scrolling with no jank or dropped frames"
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expected: "Track list, cover grid, queue panel all scroll smoothly without visible stuttering"
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why_human: "Jank/dropped frames are perceptual — cannot be measured via static code analysis"
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- test: "Switch between views (tracks, albums, artists, genres) rapidly — verify instant transitions"
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expected: "View switches are instant with no loading delay (data is pre-cached via eagerFetch)"
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why_human: "Transition smoothness is a runtime behavior requiring visual confirmation"
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- test: "Type rapidly in search bar — verify no input lag and results appear after ~150ms pause"
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expected: "Characters appear instantly, filtered results update after typing stops for ~150ms, clearing input instantly clears results"
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why_human: "Debounce feel is perceptual timing that requires human interaction"
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- test: "Visual consistency across all views — verify coherent sizing and spacing"
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expected: "Icons are consistent size per context (sm/md/lg), typography follows scale, sidebar spacing is balanced, no jarring mismatches between views"
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why_human: "Visual design coherence requires human aesthetic judgment"
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---
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# Phase 8: Frontend Performance & UX Verification Report
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**Phase Goal:** The app feels smooth and visually consistent — large libraries render without jank, and the UI follows a coherent visual language
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**Verified:** 2026-03-05T15:30:00Z
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**Status:** human_needed
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**Re-verification:** No — initial verification
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## Goal Achievement
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### Observable Truths
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The phase's success criteria from ROADMAP.md are:
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1. Track and album lists use Lit `repeat()` directive with stable keys for efficient DOM reuse during scrolling and filtering
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2. Store notifications during rapid updates are debounced via `queueMicrotask()` to prevent layout thrashing
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3. Visual inconsistencies are audited and follow a consistent pattern across all components
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4. Scrolling, view switching, and search filtering in a 10k+ track library are smooth with no visible jank
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**Important context:** Success criterion #1 was modified by hotfix `72ef719`. The original Plan 08-02 used `repeat()` as children of `lit-virtualizer`, which **defeated virtualization** (rendered ALL items, causing 2+ minute load times). The hotfix reverted to `.renderItem` + `.keyFunction` — the correct lit-virtualizer API that integrates with its viewport-based rendering. All virtualizers now have stable key functions via `.keyFunction`, achieving the **intent** of the criterion (efficient DOM reuse with stable keys) through the correct API.
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| # | Truth | Status | Evidence |
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|---|-------|--------|----------|
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| 1 | Virtualizers use stable keys for efficient DOM reuse | ✓ VERIFIED | All 7 virtualizers use `.renderItem` + `.keyFunction` with stable entity keys (FilePath, album.ID, QueueTrack.id, artist.ID, genre.name). Hotfix `72ef719` corrected the approach from `repeat()` children (which broke virtualization) to the proper `.keyFunction` API. |
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| 2 | Store notifications debounced via queueMicrotask | ✓ VERIFIED | `library-store.ts` lines 343-350: `notifyScheduled` flag + `queueMicrotask()` coalescing. Multiple `notify()` calls within a microtask tick produce 1 subscriber notification. |
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| 3 | Search input debounced ~150ms | ✓ VERIFIED | `search-bar.ts` lines 108-126: 150ms setTimeout with instant clear on empty input. |
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| 4 | Design tokens defined for icon sizes and type scale | ✓ VERIFIED | `tokens.css.ts` exports `designTokens` with `--yj-icon-sm/md/lg` (14/18/24px) and `--yj-text-xs/sm/md/lg/xl` (11/12/13/15/18px). |
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| 5 | All components use design tokens (no em-based spacing, ad-hoc icon/text sizes) | ✓ VERIFIED | 14 components import `designTokens` into `static styles`. Sidebar has zero em-based spacing. Icon sizes use `--yj-icon-*`. Text sizes use `--yj-text-*`. |
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| 6 | Render hot path optimized (classMap, no array allocations) | ✓ VERIFIED | `track-list.ts` uses `classMap` at 3 sites (track-row, fav-icon, cell). `queue-panel.ts` uses `classMap` for track-item. Zero `.filter(Boolean).join(' ')` patterns remain. Search term hoisted outside column loop. |
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| 7 | Cover-grid dynamic text sizing uses type scale tokens | ✓ VERIFIED | `cover-grid.ts` lines 757-788: Three tiers map to `--yj-text-xs`, `--yj-text-lg`/`--yj-text-sm`, `--yj-text-lg`/`--yj-text-md`. |
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| 8 | Scrolling/view switching/search filtering smooth with no jank | ? UNCERTAIN | Requires human testing with a 10k+ track library to verify runtime performance. |
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**Score:** 7/8 truths verified (1 needs human)
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### Required Artifacts
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| Artifact | Expected | Status | Details |
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|----------|----------|--------|---------|
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| `frontend/src/store/library-store.ts` | queueMicrotask coalescing | ✓ VERIFIED | `notifyScheduled` flag + `queueMicrotask()` in `notify()`. 404 lines, substantive. |
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| `frontend/src/styles/tokens.css.ts` | Design token definitions | ✓ VERIFIED | Exports `designTokens` css template with 8 custom properties. 25 lines, complete. |
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| `frontend/src/components/search-bar/search-bar.ts` | Debounced search input | ✓ VERIFIED | 150ms debounce timer, instant clear, `designTokens` imported. 180 lines. |
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| `frontend/src/components/track-list/track-list.ts` | repeat()/keyFunction + classMap + tokens | ✓ VERIFIED | `.renderItem` + `.keyFunction` (FilePath), `classMap` at 3 sites, `designTokens` imported. |
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| `frontend/src/components/queue-panel/queue-panel.ts` | keyFunction + classMap + tokens | ✓ VERIFIED | `.renderItem` + `.keyFunction` (QueueTrack.id), `classMap` for track-item, `designTokens` imported. |
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| `frontend/src/components/cover-grid/cover-grid.ts` | 3 keyFunctions + dynamic text tokens | ✓ VERIFIED | 3 virtualizers with `.keyFunction` (album.ID), dynamic text tiers mapped to tokens. |
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| `frontend/src/components/artists-view/artists-view.ts` | keyFunction for artist virtualizer | ✓ VERIFIED | `.renderItem` + `.keyFunction` (artist.ID). |
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| `frontend/src/components/genres-view/genres-view.ts` | keyFunction for genre virtualizer | ✓ VERIFIED | `.renderItem` + `.keyFunction` (genre.name). |
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| `frontend/src/components/sidebar/app-sidebar.ts` | px-based spacing, icon tokens | ✓ VERIFIED | Zero em-based spacing. `--yj-icon-md` for nav icons. `designTokens` imported. |
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| `frontend/src/components/now-playing/now-playing.ts` | Icon tokens | ✓ VERIFIED | `--yj-icon-lg` for cover placeholder. `designTokens` imported. |
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| `frontend/src/components/audio-player/controls/player-controls.ts` | Icon/type tokens | ✓ VERIFIED | `designTokens` imported. |
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| `frontend/src/components/audio-player/seekbar/seek-bar.ts` | Type tokens | ✓ VERIFIED | `designTokens` imported. |
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| `frontend/src/components/audio-player/volume-control/volume-control.ts` | Icon tokens | ✓ VERIFIED | `designTokens` imported. |
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| `frontend/src/components/audio-player/audio-player.ts` | Tokens | ✓ VERIFIED | `designTokens` imported. |
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| `frontend/src/components/cover-grid/cover-grid-styles.ts` | Type tokens in base styles | ✓ VERIFIED | `designTokens` imported, `--yj-text-sm/md` used. |
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| `frontend/src/components/track-details/track-details.ts` | Type/icon tokens | ✓ VERIFIED | `designTokens` imported. |
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| `frontend/src/components/track-info/track-info.ts` | Type tokens | ✓ VERIFIED | `designTokens` imported. |
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| `frontend/src/components/artist-details/artist-details.ts` | Type/icon tokens | ✓ VERIFIED | `designTokens` imported. |
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| `frontend/src/components/genre-details/genre-details.ts` | Type/icon tokens | ✓ VERIFIED | `designTokens` imported. |
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### Key Link Verification
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| From | To | Via | Status | Details |
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|------|----|-----|--------|---------|
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| library-store.ts | subscribers | queueMicrotask in notify() | ✓ WIRED | Lines 343-350: `queueMicrotask(() => { this.notifyScheduled = false; this.subscribers.forEach(...) })` |
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| tokens.css.ts | 14 components | `import { designTokens }` + `static styles = [designTokens, ...]` | ✓ WIRED | 28 import/usage sites across sidebar, now-playing, search-bar, audio-player (4), cover-grid (2), track-list, queue-panel, track-details, track-info, artist-details, genre-details |
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| search-bar.ts | search store | 150ms setTimeout debounce | ✓ WIRED | Lines 121-124: `this.searchDebounceTimer = setTimeout(() => { this.searchCtrl.term = value; }, 150)` |
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| track-list.ts | lit-virtualizer | .renderItem + .keyFunction | ✓ WIRED | Line 1740-1741: `.renderItem=${this.renderTrackRow}` + `.keyFunction=${(track) => track.FilePath}` |
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| cover-grid.ts | lit-virtualizer (×3) | .renderItem + .keyFunction | ✓ WIRED | Lines 1850-1851, 1877-1878, 1906-1907: All use `.renderItem` + `.keyFunction` with `entry.album.ID` |
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| queue-panel.ts | lit-virtualizer | .renderItem + .keyFunction | ✓ WIRED | Lines 1283-1284: `.renderItem=${this.renderTrackItem}` + `.keyFunction=${(track) => track.id}` |
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| artists-view.ts | lit-virtualizer | .renderItem + .keyFunction | ✓ WIRED | Lines 1219-1220: `.renderItem` + `.keyFunction=${(entry) => entry.artist.ID}` |
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| genres-view.ts | lit-virtualizer | .renderItem + .keyFunction | ✓ WIRED | Lines 1171-1172: `.renderItem` + `.keyFunction=${(entry) => entry.genre.name}` |
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| track-list.ts renderTrackRow | classMap directive | import + 3 usage sites | ✓ WIRED | Line 29 import, lines 1542, 1559, 1585 usage |
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| queue-panel.ts renderTrackItem | classMap directive | import + 1 usage site | ✓ WIRED | Line 19 import, line 1156 usage |
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### Requirements Coverage
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| Requirement | Source Plan(s) | Description | Status | Evidence |
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|-------------|---------------|-------------|--------|----------|
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| **PERF-05** | 08-01, 08-02, 08-03 | Frontend track/album lists use stable keys for DOM reuse; store notifications debounced via queueMicrotask() | ✓ SATISFIED | All 7 virtualizers have `.keyFunction` with stable entity keys. Library store uses queueMicrotask coalescing. Search debounced 150ms. classMap eliminates per-row allocations. |
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| **UX-01** | 08-01, 08-04 | Visual inconsistencies audited and fixed (spacing, colors, typography, icon sizing follow consistent pattern) | ✓ SATISFIED | Design tokens defined and applied across 14 components. Sidebar em→px conversion complete. Cover-grid dynamic text mapped to type scale. Human-verified during Plan 04 execution. |
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| **UX-02** | 08-02, 08-03 | Frontend rendering for large libraries smooth — no jank during scrolling, view switching, search filtering | ? NEEDS HUMAN | Code-level optimizations verified (keyed virtualizers, classMap, search debounce, store coalescing). Runtime smoothness requires human testing with 10k+ library. |
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No orphaned requirements — REQUIREMENTS.md maps PERF-05, UX-01, UX-02 to Phase 8, and all three appear in plan frontmatter.
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### Anti-Patterns Found
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| File | Line | Pattern | Severity | Impact |
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|------|------|---------|----------|--------|
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| cover-grid.ts | 765 | `'10px'` hardcoded (artist name small tier) | ℹ️ Info | Only one value in the small-card tier doesn't map to a token. 10px is below --yj-text-xs (11px). Acceptable — no token exists for sub-xs sizing. |
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No TODOs, FIXMEs, PLACEHOLDERs, or stubs found in any modified file. TypeScript compiles clean (`npx tsc --noEmit` produces zero errors).
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### Human Verification Required
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### 1. Large Library Scroll Performance
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**Test:** Open a library with 10k+ tracks. Scroll through the track list, cover grid, and queue panel rapidly.
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**Expected:** Smooth scrolling with no visible jank, stuttering, or dropped frames. DOM inspector should show only ~20-50 rendered rows at any time (virtualization working).
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**Why human:** Jank perception is a runtime visual behavior that cannot be verified through static code analysis.
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### 2. View Switching Speed
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**Test:** Switch rapidly between tracks, albums, artists, and genres views.
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**Expected:** Instant view transitions with no loading spinners or blank screens. Data is pre-cached via deferred eagerFetch.
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**Why human:** Transition speed is a runtime behavior affected by data size, browser rendering, and perceived responsiveness.
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### 3. Search Debounce Feel
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**Test:** Type rapidly in the search bar, then stop. Clear the search.
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**Expected:** Characters appear instantly in the input. Filtered results update ~150ms after typing stops. Clearing the input instantly clears results (no 150ms delay on clear).
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**Why human:** Debounce timing is a subjective UX feel that requires human interaction.
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### 4. Visual Consistency Audit
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**Test:** Navigate through all views: sidebar, track list, cover grid (small/medium/large cards), queue panel, now-playing, search bar, audio player, artist/genre/track details.
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**Expected:** Icons are consistently sized per context (small indicators, medium controls, large placeholders). Typography follows the type scale. Sidebar spacing is balanced after em→px conversion. No jarring size mismatches between views.
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**Why human:** Visual design coherence requires human aesthetic judgment.
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**Note:** Plan 04 Task 3 was a human-verify checkpoint that was marked "approved" during execution. If the same human verified this, items 3-4 may already be satisfied.
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### Gaps Summary
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No code-level gaps found. All automated checks pass:
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- ✅ All 7 virtualizers use `.renderItem` + `.keyFunction` with stable keys (hotfix `72ef719` confirmed)
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- ✅ Library store queueMicrotask coalescing operational
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- ✅ Search input 150ms debounce with instant clear
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- ✅ Design tokens defined and adopted by 14 components
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- ✅ classMap eliminates array allocations in render hot paths
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- ✅ Cover-grid dynamic text tiers mapped to type scale tokens
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- ✅ Zero em-based spacing in sidebar
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- ✅ TypeScript compiles without errors
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- ✅ Zero TODOs/FIXMEs/stubs in modified files
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- ✅ All 9 phase commits verified in git history
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The single remaining concern is runtime performance verification with a large library, which requires human testing.
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---
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_Verified: 2026-03-05T15:30:00Z_
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_Verifier: Claude (gsd-verifier)_
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