## Overview
Complete migration from service layer to TanStack Query v6 with
mutations, queries, and automatic cache management.
## What Was Completed
### Phase 1: Entity Queries & Database Pages ✅
- Created `entity.queries.ts` with query options for weapons,
characters, and summons
- Migrated all database detail pages to use TanStack Query with
`withInitialData()` pattern
- SSR with client-side hydration working correctly
### Phase 2: Server Load Cleanup ✅
- Removed PartyService dependency from teams detail server load
- Server loads now use adapters directly instead of service layer
- Cleaner separation of concerns
### Phase 3: Party.svelte Refactoring ✅
- Removed all PartyService, GridService, and ConflictService
dependencies
- Migrated to TanStack Query mutations for all operations:
- Grid operations: create, update, delete, swap, move
- Party operations: update, delete, remix, favorite, unfavorite
- Added swap/move mutations for drag-and-drop operations
- Automatic cache invalidation and query refetching
### Phase 4: Service Layer Removal ✅
- Deleted all service layer files (~1,345 lines removed):
- `party.service.ts` (620 lines)
- `grid.service.ts` (450 lines)
- `conflict.service.ts` (120 lines)
- `gridOperations.ts` (unused utility)
- Deleted empty `services/` directory
- Created utility functions for cross-cutting concerns:
- `localId.ts`: Anonymous user local ID management
- `editKeys.ts`: Edit key management for anonymous editing
- `party-context.ts`: Extracted PartyContext type
### Phase 5: /teams/new Migration ✅
- Migrated party creation wizard to use TanStack Query mutations
- Replaced all direct adapter calls with mutations (7 locations)
- Maintains existing behavior and flow
- Automatic cache invalidation for newly created parties
## Benefits
### Performance
- Automatic request deduplication
- Better cache utilization across pages
- Background refetching for fresh data
- Optimistic updates for instant UI feedback
### Developer Experience
- Single source of truth for data fetching
- Consistent patterns across entire app
- Query devtools for debugging
- Less boilerplate code
### Code Quality
- ~1,088 net lines removed
- Simpler mental model (no service layer)
- Better TypeScript inference
- Easier to test
### Architecture
- **100% TanStack Query coverage** - no service layer, no direct adapter
calls
- Clear separation: UI ← Queries/Mutations ← Adapters ← API
- Automatic cache management
- Consistent mutation patterns everywhere
## Testing
All features verified:
- Party creation (anonymous & authenticated)
- Grid operations (add, remove, update, swap, move)
- Party operations (update, delete, remix, favorite)
- Cache invalidation across tabs
- Error handling and rollback
- SSR with hydration
## Files Modified
### Created (3)
- `src/lib/types/party-context.ts`
- `src/lib/utils/editKeys.ts`
- `src/lib/utils/localId.ts`
### Deleted (4)
- `src/lib/services/party.service.ts`
- `src/lib/services/grid.service.ts`
- `src/lib/services/conflict.service.ts`
- `src/lib/utils/gridOperations.ts`
### Modified (13)
- `src/lib/api/mutations/grid.mutations.ts`
- `src/lib/components/grids/CharacterGrid.svelte`
- `src/lib/components/grids/SummonGrid.svelte`
- `src/lib/components/grids/WeaponGrid.svelte`
- `src/lib/components/party/Party.svelte`
- `src/routes/teams/new/+page.svelte`
- Database entity pages (characters, weapons, summons)
- Other supporting files
## Migration Complete
This PR completes the TanStack Query migration. The entire application
now uses TanStack Query v6 for all data fetching and mutations, with
zero remaining service layer code.
---------
Co-authored-by: Claude <noreply@anthropic.com>
added @tanstack/svelte-query-devtools (dev only)
- shows in dev mode only, tree-shaken from production
- provides visual debugging of queries, cache, and mutations
- accessible via floating icon in bottom-right corner
## Summary
This PR establishes the foundation for migrating from custom Svelte 5
resource classes to TanStack Query v6 for server state management. It
adds:
**Query Options Factories** (in `src/lib/api/queries/`):
- `party.queries.ts` - Party fetching with infinite scroll support
- `job.queries.ts` - Job and skill queries with pagination
- `user.queries.ts` - User profile, parties, and favorites queries
**Mutation Configurations** (in `src/lib/api/mutations/`):
- `party.mutations.ts` - Party CRUD with cache invalidation
- `grid.mutations.ts` - Weapon/character/summon mutations with
optimistic updates
- `job.mutations.ts` - Job and skill update mutations
**Deprecation Notices**:
- Added `@deprecated` JSDoc to `search.resource.svelte.ts` and
`party.resource.svelte.ts` with migration examples
**SSR Integration** (Phase 4):
- Created `+layout.ts` to initialize QueryClient for SSR support
- Updated `+layout.svelte` to receive QueryClient from load function
- Added SSR utilities in `src/lib/query/ssr.ts`:
- `withInitialData()` - for pages using +page.server.ts
- `prefetchQuery()` / `prefetchInfiniteQuery()` - for pages using
+page.ts
- `setQueryData()` - for direct cache population
- Added documentation in `src/lib/query/README.md`
**Component Wiring Examples** (Phase 5):
- `JobSelectionSidebar.svelte` - Migrated from `createJobResource()` to
`createQuery(() => jobQueries.list())`. Demonstrates client-side query
pattern with automatic loading/error states.
- `teams/[id]/+page.svelte` - Added `withInitialData()` pattern for SSR
integration. Server-fetched party data is used as initial cache value
with background refetching support.
**Migration Guide**:
- Added `src/lib/query/MIGRATION.md` with follow-up prompts for
remaining component migrations (JobSkillSelectionSidebar, search modal,
user profile, teams explore, Party mutations, resource class removal)
## Updates Since Last Revision
Fixed TypeScript type errors in the TanStack Query integration:
- `party.queries.ts`: Made `total` and `perPage` optional in
`PartyPageResult` interface to match adapter return type
- `ssr.ts`: Fixed `withInitialData` to properly handle null values using
`NonNullable<TData>` return type
- `job.mutations.ts`: Fixed slot indexing by casting through `unknown`
to `keyof typeof updatedSkills`
Type checks now pass for all files modified in this PR (16 remaining
errors are pre-existing project issues unrelated to this PR - paraglide
modules not generated, hooks.ts implicit anys).
## Review & Testing Checklist for Human
- [ ] **Verify app loads correctly**: The `+layout.ts` and
`+layout.svelte` changes are critical path - confirm the app still
renders
- [ ] **Test JobSelectionSidebar**: Open job selection sidebar and
verify jobs load correctly, search/filter works, and retry button works
on error
- [ ] **Test teams/[id] page**: Navigate to a party detail page and
verify it renders without loading flash (SSR data should be immediate)
- [ ] **Review type casts**: Check `job.mutations.ts:135` - the `as
unknown as keyof typeof` cast for slot indexing is a workaround for
jobSkills having string literal keys ('0', '1', '2', '3') while slot is
a number
- [ ] **Verify withInitialData behavior**: The `NonNullable<TData>`
return type change in `ssr.ts` should work correctly with `data.party`
which can be `Party | null`
**Recommended test plan**:
1. Run `pnpm install` to ensure dependencies are up to date
2. Start dev server and verify the app loads without errors
3. Navigate to a party detail page (`/teams/[shortcode]`) - should
render immediately without loading state
4. Open job selection sidebar (click job icon on a party you can edit) -
verify jobs load and filtering works
5. Test error handling by temporarily breaking network - verify retry
button appears
### Notes
- Pre-existing project issues remain (paraglide modules not generated,
hooks.ts implicit anys) - these are unrelated to this PR
- Local testing could not run due to missing node_modules (vite not
found) - project setup issue
- TanStack Query devtools installation was skipped due to Storybook
version conflicts
- The existing `search.queries.ts` file was used as the pattern
reference for new query factories
- SSR approach uses hybrid pattern: existing `+page.server.ts` files
work with `withInitialData()`, while new pages can use `prefetchQuery()`
in `+page.ts`
- Migration guide includes 6 follow-up prompts for completing the
remaining component migrations
**Link to Devin run**:
https://app.devin.ai/sessions/33e97a98ae3e415aa4dc35378cad3a2b
**Requested by**: Justin Edmund (justin@jedmund.com) / @jedmund
---------
Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Co-authored-by: Justin Edmund <justin@jedmund.com>
- integrate @tanstack/svelte-query into layout
- add query client factory and query keys
- new InfiniteScrollQuery component for paginated data
- search query options for weapons/characters/summons
- update dev port to 5174
- Added beforeNavigate hook to close sidebar when navigating between pages
- Prevents search sidebar from staying open when browsing different sections
- Ensures clean UI state transitions between pages
