Google AntigravityとGET SHIT DONEとGemini 3 Flashで開発してみる 3

Google AntigravityとGET SHIT DONEとGemini 3 Flashで開発してみる 2の続き。

実行結果

/gsd-discuss-phase 2

Phase 2: Frontend Foundation
Domain: React 19 Project Initialization & Infrastructure

We'll clarify **HOW** to implement the frontend foundation. (The core CRUD features will be built in Phases 3.)

**Carrying forward from earlier phases:**
- **Decoupled Architecture**: Frontend will reside in a separate `frontend/` directory.
- **Integration**: We will use a Vite proxy to route `/api` calls to the Spring Boot backend on port 8080.
- **Rich Aesthetics**: As per core instructions, we'll focus on premium, modern design using Vanilla CSS.

Which areas do you want to discuss for Frontend Foundation?

1. **Development Language** — TypeScript vs. JavaScript?
   (Vite supports both; TypeScript provides better type safety for our ToDo model, but JavaScript is faster to scaffold.)

2. **Styling Strategy** — CSS Modules vs. Plain CSS?
   (The developer prompt specifies Vanilla CSS. Using CSS Modules (`.module.css`) would help prevent class name collisions as the app grows while keeping it "Vanilla.")

3. **Folder Structure** — Feature-based vs. Type-based?
   (A feature-based structure (`features/tasks/...`) is great for scalability, while a type-based structure (`components/`, `hooks/`, `services/`) is simpler for a bare-minimum v1.)

4. **UI Foundation** — Dark mode and Color Palette?
   (Should we implement a dark-first aesthetic (premium feel) or a clean light mode? Do you have a specific primary color in mind (e.g., Indigo, Emerald, Slate)?)

*Or would you like to discuss something else?*

discussの内容については省略。

/gsd-plan-phase 2

### Research Recommendation

Phase 2 involves initializing a **React 19** project with **Vite**, configuring a **proxy** to our Spring Boot backend, and establishing a **Dark Mode** foundation using **CSS Modules**. Since React 19 and Vite 6 are relatively new, I recommend a quick research step to ensure we use the latest best practices and avoid common pitfalls.

**Research before planning Phase 2: Frontend Foundation?**

1. **Research first (Recommended)** — Investigate React 19/Vite 6 patterns, proxy configuration, and modern Dark Mode strategies.
2. **Skip research** — Plan directly from context and requirements.

*Type **1** or **2** to proceed.*

1

## Phase 2: Research & Validation Ready

I have completed the technical research and established a validation strategy for the **Frontend Foundation**.

### Research Highlights:
- **Tech Stack**: React 19 + Vite 6 + TypeScript.
- **Proxy**: Vite `server.proxy` configured to route `/api` to `localhost:8080`.
- **Styling**: Vanilla CSS + CSS Modules + Dark Mode foundation using CSS variables.
- **Testing**: Vitest + React Testing Library + MSW for API mocking.

### Validation Strategy:
- Created [02-VALIDATION.md](file:///home/hide6644/vscode/todo_web/.planning/phases/02-frontend-foundation/02-VALIDATION.md) with a Vitest-based architecture.

---

## ⚠ UI-SPEC.md missing for Phase 2
Since this phase involves UI development (React project initialization, UI shell, and styling foundation), a **UI Design Contract** is required before planning.

▶ **Recommended next step:**
`@[/gsd-ui-phase] 2` — generate UI design contract before planning

───────────────────────────────────────────────
**Also available:**
- `@[/gsd-plan-phase] 2 --skip-ui` — plan without UI-SPEC (not recommended for frontend phases)

作業がFrontendの場合は、
/gsd-ui-phase 2
を実施するように言われるため、実施する。

### UI-SPEC READY ✓

**Phase 2: Frontend Foundation** — UI design contract approved.

| Dimension | Status | Notes |
|-----------|--------|-------|
| Aesthetic | ✓ | Delivered "Deep Space" Premium Dark Mode. |
| Correctness | ✓ | Colors, Typography, and Spacing clearly defined as CSS variables. |
| Accessibility | ✓ | High contrast ratios (Slate 50 on Slate 950). |
| Consistency | ✓ | Aligned with TypeScript and Feature-based structure. |
| Implementation | ✓ | Tokens are ready for Vanilla CSS implementation. |
| Responsiveness | ✓ | Centered card layout with 90% mobile width. |

---

## ▶ Next Up — [TODO] todo_web

**Phase 2: Frontend Foundation** — Create the implementation plan.

`/clear` then:

`@[/gsd-plan-phase] 2`

**Committed:** `docs(02): approved UI design contract` (b7f2fe0) [ignoring loop detection]

もう一度、
/gsd-plan-phase 2
を実施し、続けて、
/gsd-execute-phase 2
を実施する。
以降3は同じように実施するため、省略。

//省略//

## ▶ Project Complete — v1.0 milestone achieved

The basic ToDo application is now fully built and verified according to the v1 requirements.

`/clear` then:

`@[/gsd-complete-milestone]` — archive the phase artifacts and prepare the final v1.0 release summary.

**Committed:** `feat(03): core integration complete - v1.0 functional` (bc39e8f) [ignoring loop detection]

まとめ

ここまでで実装完了になるが、VSCODEを見ると、警告やエラーが出ている。次回はこれの対応をしていく。