113 lines
2.3 KiB
Markdown
113 lines
2.3 KiB
Markdown
# ADR-003: Leptos CSR-Only para Frontend
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**Status**: Accepted | Implemented
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**Date**: 2024-11-01
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**Deciders**: Frontend Architecture Team
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**Technical Story**: Selecting WASM framework for client-side Kanban board UI
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---
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## Decision
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Usar **Leptos 0.8.12 en modo Client-Side Rendering (CSR)** para frontend WASM, sin SSR.
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## Rationale
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1. **Fine-Grained Reactivity**: Similar to SolidJS (not virtual DOM), updates only affected nodes
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2. **WASM Performance**: Compiles to optimized WebAssembly
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3. **Deployment Simplicity**: CSR = static files + API, no server-side rendering complexity
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4. **VAPORA is a Platform**: Not a content site, so no SEO requirement
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---
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## Alternatives Considered
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### ❌ Yew
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- Virtual DOM model (slower updates)
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- Larger bundle size
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### ❌ Dioxus
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- Promising but less mature ecosystem
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### ✅ Leptos CSR (CHOSEN)
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- Fine-grained reactivity, excellent performance
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- No SEO needed for platform
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---
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## Trade-offs
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**Pros**:
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- ✅ Excellent WASM performance
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- ✅ Simple deployment (static files)
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- ✅ UnoCSS integration for glassmorphism styling
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- ✅ Strong type safety in templates
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**Cons**:
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- ⚠️ No SEO (not applicable for platform)
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- ⚠️ Smaller ecosystem than React/Vue
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- ⚠️ Leptos SSR available but adds complexity
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---
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## Implementation
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**Leptos Component Example**:
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```rust
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#[component]
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fn ProjectBoard() -> impl IntoView {
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let (projects, set_projects) = create_signal(vec![]);
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view! {
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<div class="grid grid-cols-3 gap-4">
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<For each=projects key=|p| p.id let:project>
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<ProjectCard project />
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</For>
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</div>
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}
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}
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```
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**Key Files**:
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- `/crates/vapora-frontend/src/main.rs` (app root)
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- `/crates/vapora-frontend/src/pages/` (page components)
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- `/crates/vapora-frontend/Cargo.toml` (dependencies)
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---
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## Verification
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```bash
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# Build WASM
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trunk build --release
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# Serve and test
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trunk serve
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# Check bundle size
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ls -lh dist/index_*.wasm
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```
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**Expected**: WASM bundle < 500KB, components render reactively
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---
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## Consequences
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- Team must learn Leptos reactive system
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- SSR not available (acceptable trade-off)
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- Maintenance: Leptos updates follow Rust ecosystem
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---
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## References
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- [Leptos Documentation](https://leptos.dev/)
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- `/crates/vapora-frontend/src/` (source code)
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---
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**Related ADRs**: ADR-001 (Workspace)
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