SPA Routes and Features Guide

SPA structure:

• src/spa/ – Entry points (entry.web.tsx, entry.mobile.tsx, entry.desktop.tsx) and router config (router/). Router lives here to avoid confusion with src/routes/.
• src/routes/ – Page segments only (roots).
• src/features/ – Business logic and UI by domain.

This project uses a roots vs features split: src/routes/ only holds page segments; business logic and UI live in src/features/ by domain.

Agent constraint — shared desktop router: Common Web/Electron paths, nesting, metadata, lazy loaders, and preload groups belong in src/spa/router/desktopRouter.shared.tsx. The two desktopRouter.config* files are thin platform adapters; change them only for genuine runtime differences. Do not duplicate a common route in both adapters.

When to Use This Skill

• Adding a new SPA route or route segment
• Defining or refactoring layout/page files under src/routes/
• Moving route-specific components or logic into src/features/
• Deciding where to put a new component (route folder vs feature folder)

---

1. What Belongs in src/routes/ (roots)

Each route directory should contain only:

File / folder	Purpose
_layout/index.tsx or layout.tsx	Layout for this segment: wrap with <Outlet />, optional shell (e.g. sidebar + main). Should be thin: prefer re-exporting or composing from @/features/*.
index.tsx or page.tsx	Page entry for this segment. Only import from features and render; no business logic.
[param]/index.tsx (e.g. [id], [cronId])	Dynamic segment page. Same rule: thin, delegate to features.

Rule: Route files should only import and compose. No new features/ folders or heavy components inside src/routes/.

---

2. What Belongs in src/features/

Put domain-oriented UI and logic here:

• Layout building blocks: sidebars, headers, body panels, drawers
• Hooks and store usage for that domain
• Domain-specific forms, lists, modals, etc.

Organize by domain (e.g. Pages, Home, Agent, PageEditor), not by route path. One route can use several features; one feature can be used by several routes.

Each feature should:

• Live under src/features/<FeatureName>/
• Export a clear public API via index.ts or index.tsx
• Use @/features/<FeatureName>/... for internal imports when needed

---

3. How to Add a New SPA Route

1. Choose the route group

   • (main)/ – desktop main app
   • (mobile)/ – mobile
   • (desktop)/ – Electron-specific
   • onboarding/, share/ – special flows

2. Create only segment files under src/routes/

   • e.g. src/routes/(main)/my-feature/_layout/index.tsx and src/routes/(main)/my-feature/index.tsx (and optional [id]/index.tsx).

3. Implement layout and page content in src/features/

   • Create or reuse a domain (e.g. src/features/MyFeature/).
   • Put layout (sidebar, header, body) and page UI there; export from the feature’s index.

4. Keep route files thin

   • Layout: export { default } from '@/features/MyFeature/MyLayout' or compose a few feature components + <Outlet />.
   • Page: import from @/features/MyFeature (or a specific subpath) and render; no business logic in the route file.

5. Register the route in the correct definition layer

   • Shared Web/Electron route: add the segment once in desktopRouter.shared.tsx with dynamicElement / dynamicLayout. Put its preloadId there as part of the shared lazy-loader definition.
   • Web-only or Electron-only route: add it to the corresponding thin desktopRouter.config.tsx adapter. Keep platform-only differences explicit and small.
   • Mobile-only flow: use mobileRouter.config.tsx; mobile does not consume the shared desktop tree.

6. Register a route skeleton (REQUIRED for every lazy route)

   • Every lazy route inside the main area renders RouteSegmentSkeleton (src/components/Skeleton/RouteSegment.tsx) while its chunk loads. It resolves via handle.meta.Skeleton only (deepest match wins, walking up through parent routes). Omitting Skeleton renders a blank pane — use NoRouteSkeleton when that is intentional.
   • Pick the skeleton when adding or restructuring a route:

---

3a. Shared desktop route definition and platform adapters

File	Role
desktopRouter.shared.tsx	Single source of truth for common paths, nesting, metadata, lazy imports, and prioritized route preload groups.
desktopRouter.config.tsx	Thin Web adapter: mounts the common content tree at / and adds Web-only routes.
desktopRouter.config.desktop.tsx	Thin Electron adapter: injects per-tab Home behavior, TabHost root stubs, and Electron-only onboarding.

Add or remove common routes only in desktopRouter.shared.tsx. Keep desktopRouter.sync.test.tsx passing so path behavior, lazy boundaries, preload ownership, and the intentional platform differences remain verified.

---

3b. Other .desktop.{ts,tsx} variants inside src/routes/

The thin router adapters are not duplicated trees. Other route modules may still colocate a <name>.desktop.{ts,tsx} next to a base <name>.{ts,tsx}; Vite's resolver swaps in the .desktop file for Electron builds. Those paired module implementations still carry a drift risk.

Known variants today:

Base file (web)	Desktop file (Electron)	Purpose
src/features/Settings/features/componentMap.ts	src/features/Settings/features/componentMap.desktop.ts	Settings tab → component map. Web uses dynamic import(); desktop uses sync imports. componentMap.sync.test.ts enforces identical keys.
src/routes/(main)/agent/index.tsx	src/routes/(main)/agent/index.desktop.tsx	Page entry. Desktop variant overrides the web page wholesale (e.g. extra popup guards).
src/routes/(main)/group/index.tsx	src/routes/(main)/group/index.desktop.tsx	Same pattern as agent.

Rules:

1. After editing any .ts/.tsx under src/routes/, glob the same directory for a <filename>.desktop.{ts,tsx} sibling. If one exists, apply the equivalent change there in the same commit.
2. When adding a new SettingsTab, register it in both componentMap.ts (with dynamic(...)) and componentMap.desktop.ts (with a sync import). componentMap.sync.test.ts will fail the build otherwise.
3. When adding a new desktop-only page wholesale-override, prefer a single base file with platform-aware code over introducing a new .desktop.tsx variant — only add a new variant when the two trees genuinely diverge (different store wiring, different popup guards, etc.).
4. When deleting, remove both files together.

---

4. How to Divide Files (route vs feature)

Question	Put in src/routes/	Put in src/features/
Is it the route’s layout wrapper or page entry?	Yes – _layout/index.tsx, index.tsx, [id]/index.tsx	No
Does it contain business logic or non-trivial UI?	No	Yes – under the right domain
Is it a reusable layout piece (sidebar, header, body)?	No	Yes
Is it a hook, store usage, or domain logic?	No	Yes
Is it only re-exporting or composing feature components?	Yes	No

Examples

• Route (thin):
  src/routes/(main)/page/_layout/index.tsx → export { default } from '@/features/Pages/PageLayout'
• Feature (real implementation):
  src/features/Pages/PageLayout/ → Sidebar, DataSync, Body, Header, styles, etc.
• Route (thin):
  src/routes/(main)/page/index.tsx → Import PageTitle, PageExplorerPlaceholder from @/features/Pages and @/features/PageExplorer; render with <PageTitle /> and placeholder.
• Feature:
  Page list, actions, drawers, and hooks live under src/features/Pages/.

---

5. Progressive Migration (existing code)

Existing routes follow this structure unevenly: some are already thin segment files (e.g. src/routes/(main)/page/, src/routes/(main)/settings/), while others still hold logic or a features/ folder under src/routes/. Check the route's current state instead of assuming.

When touching an old route that still has logic or features/ inside src/routes/:

1. Prefer adding new code in src/features/<Domain>/ and importing from routes.
2. For larger refactors, move existing route-only logic into the right feature and then thin out the route files (re-export or compose from features).
3. Use git mv when moving files so history is preserved.

---

6. Reference Structure (after Phase 1)

Route (thin):

src/routes/(main)/page/
├── _layout/index.tsx   → re-export or compose from @/features/Pages/PageLayout
├── index.tsx          → import from @/features/Pages, @/features/PageExplorer
└── [id]/index.tsx     → import from @/features/Pages, @/features/PageExplorer

Feature (implementation):

src/features/Pages/
├── index.ts            → export PageLayout, PageTitle
├── PageTitle.tsx
└── PageLayout/
    ├── index.tsx       → Sidebar + Outlet + DataSync
    ├── DataSync.tsx
    ├── Sidebar.tsx
    ├── style.ts
    ├── Body/           → list, actions, drawer, etc.
    └── Header/         → breadcrumb, add button, etc.

Router config continues to point at route paths (e.g. @/routes/(main)/page, @/routes/(main)/page/_layout); route files then delegate to features.