feat: upgrade deps — React 19, Vite 8, TS 6, ESLint 9 flat config, Re…#29
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…act Router v7
- React 18 → 19, react-dom 18 → 19, @types/react/react-dom updated
- Vite 6 → 8, @vitejs/plugin-react 4 → 6
- TypeScript 4.6 → 6.0 (fix: esModuleInterop=true, moduleResolution=Bundler,
JSX.Element → React.ReactElement)
- ESLint 8 + .eslintrc.cjs → ESLint 9 + eslint.config.mjs flat config
(typescript-eslint@8, @eslint/js, globals, @vitest/eslint-plugin;
drop eslint-plugin-react@7 — incompatible with ESLint 9 API)
- Prettier 2 → 3, eslint-config-prettier 8 → 10
- eslint-plugin-react-hooks 4 → 7 (flat config support)
- TailwindCSS 3.0 → 3.4 (latest v3)
- React Router v7 wired up in SPA mode (createBrowserRouter in main.tsx)
- Fix unused count/setCount state in App.tsx, empty test → test.todo,
sum type {} → number, clear empty setupTests.ts
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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…act Router v7