29 lines
1.6 KiB
Markdown
29 lines
1.6 KiB
Markdown
---
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name: Frontend
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description: Svelte SPA structure and conventions.
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applyTo: "frontend/src/**"
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---
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# Frontend
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- SPA entry point is `frontend/src/index.ts`, main component is `frontend/src/App.svelte`.
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- Component organization: `lib/` for utilities and stores, keep route components in a `routes/` folder when needed, `css/` for styles.
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- Use PascalCase component names and export props at the top of the `<script>` tag; keep code/comments in English.
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- SSR safety: guard browser-only code with `typeof window !== "undefined"`.
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- API behavior: PUT responses return only changed fields; filter by id uses `_id`; API requests reject non-2xx with `{ response, data }` and error payload in `error.data.error`.
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## i18n
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- `svelte-i18n` is configured in `frontend/src/lib/i18n/index.ts` with lazy loading for locale files.
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- Locale files live in `frontend/src/lib/i18n/locales/{lang}.json`.
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- URL-based language routing: `/{lang}/...` (e.g. `/de/`, `/en/about`).
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- Language utilities in `frontend/src/lib/i18n.ts`: `extractLanguageFromPath()`, `localizedPath()`, `getLanguageSwitchUrl()`.
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- Use `$_("key")` from `svelte-i18n` for translations in components.
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## E2E Tests (Playwright)
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- When developing frontend features: extend or create corresponding E2E tests in `tests/e2e/`.
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- Shared fixtures and helpers in `tests/e2e/fixtures.ts`: `waitForSpaReady(page)`, `navigateToRoute(page, path)`, `clickSpaLink(page, selector)`, `authedPage` fixture.
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- After frontend changes, run only the affected E2E tests: `npx playwright test tests/e2e/filename.spec.ts` or `-g "test name"`.
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- When tests fail, clarify whether the frontend or the test needs adjustment – coordinate with the user.
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