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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
95 lines
3.6 KiB
Markdown
95 lines
3.6 KiB
Markdown
---
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phase: 08-frontend-performance-ux
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plan: 01
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subsystem: frontend
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tags: [lit, queueMicrotask, debounce, css-custom-properties, design-tokens]
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# Dependency graph
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requires: []
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provides:
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- queueMicrotask-based notification coalescing in library store
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- debounced search input (150ms) with instant clear
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- design token CSS custom properties for icon sizes and type scale
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affects: [08-02, 08-03, 08-04]
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# Tech tracking
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tech-stack:
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added: []
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patterns: [queueMicrotask coalescing, debounced input propagation, design tokens via Lit css tagged templates]
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key-files:
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created:
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- frontend/src/styles/tokens.css.ts
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modified:
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- frontend/src/store/library-store.ts
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- frontend/src/components/search-bar/search-bar.ts
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key-decisions:
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- "queueMicrotask coalescing over setTimeout for synchronous-batch notification"
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- "150ms debounce with instant clear on empty input for responsive UX"
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- ":host scoped design tokens for component-level adoption"
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patterns-established:
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- "queueMicrotask coalescing: coalesce multiple notify() calls per microtask tick into one subscriber notification"
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- "Design token import pattern: import { designTokens } from styles/tokens.css and include in static styles array"
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requirements-completed: [PERF-05, UX-01]
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# Metrics
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duration: 1min
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completed: 2026-03-05
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---
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# Phase 08 Plan 01: Performance Plumbing & Design Tokens Summary
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**queueMicrotask notification coalescing in library store, 150ms debounced search input, and design token CSS custom properties for icon/type sizing**
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## Performance
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- **Duration:** 1 min
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- **Started:** 2026-03-05T04:13:30Z
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- **Completed:** 2026-03-05T04:15:16Z
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- **Tasks:** 2
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- **Files modified:** 3
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## Accomplishments
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- Library store notify() coalesces 8+ notifications during scan invalidation into a single subscriber notification per microtask tick
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- Search input debounces store propagation by 150ms while maintaining instant visual feedback and instant clear
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- Design token file defines --yj-icon-sm/md/lg and --yj-text-xs/sm/md/lg/xl CSS custom properties for consistent sizing
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## Task Commits
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Each task was committed atomically:
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1. **Task 1: Add queueMicrotask debouncing to library store and search input debounce** - `3bf66ed` (perf)
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2. **Task 2: Define design token CSS custom properties for icon sizes and type scale** - `1444a66` (feat)
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## Files Created/Modified
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- `frontend/src/store/library-store.ts` - Added notifyScheduled flag and queueMicrotask coalescing in notify()
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- `frontend/src/components/search-bar/search-bar.ts` - Added 150ms debounce timer for search store propagation
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- `frontend/src/styles/tokens.css.ts` - New design token file with icon sizes and type scale custom properties
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## Decisions Made
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- Used queueMicrotask over setTimeout for notification coalescing — synchronous microtask batching is more predictable and lower latency than macrotask scheduling
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- 150ms debounce with instant clear on empty input — balances responsiveness with avoiding unnecessary computation; empty clears are immediate for snappy UX
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- Design tokens scoped to :host — each component that imports the stylesheet gets its own token scope, matching Lit's shadow DOM encapsulation model
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## Deviations from Plan
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None - plan executed exactly as written.
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## Issues Encountered
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None
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## User Setup Required
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None - no external service configuration required.
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## Next Phase Readiness
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- Performance plumbing and design tokens in place
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- Ready for Plan 02 (subsequent frontend work can import designTokens)
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- Library store subscribers will automatically benefit from coalesced notifications
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---
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*Phase: 08-frontend-performance-ux*
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*Completed: 2026-03-05*
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