CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

Tech Stack

SvelteKit 5 + TypeScript + Bun + Tailwind v4 + better-sqlite3
Auth via Synology SSO Server (OIDC) using Auth.js

Development Commands

bun run dev          # Start dev server
bun run build        # Production build
bun run check        # TypeScript type-check
bun run lint         # ESLint (must pass with 0 errors)
bun run format       # Prettier formatting
bun run test         # Run unit tests (must all pass)
bun run test:watch   # Run tests in watch mode
bun run test:coverage # Run tests with coverage report

Code Quality

Linting and tests must pass before considering any task complete

After making changes, always verify:

bun run lint — must exit with 0 errors (warnings are acceptable)
bun run test — all tests must pass

Write unit tests after every major feature

When adding or significantly modifying server-side business logic (files under src/lib/server/), write corresponding unit tests in a .test.ts file alongside the module (e.g. src/lib/server/lodgings.test.ts).

Tests use Vitest with an in-memory SQLite database. Use the setupTestDb() helper from src/tests/helpers.ts to get a fresh DB per test:

import { setupTestDb } from '../../tests/helpers.js';
import type { Database } from './db/types.js';

let db: Database;
beforeEach(() => { db = setupTestDb(); });
afterEach(() => { db.close(); });

Test coverage should include the happy path, optional fields, ownership/authorisation checks, and any relationship linking (e.g. guests, travellers).

ESLint notes

svelte/require-each-key is set to warn — keyless {#each} blocks are acceptable where keys are not meaningful
@typescript-eslint/no-unused-expressions is off — the value; reactivity-tracking pattern used in Svelte 5 $effect blocks is intentional
Prefix unused variables/args/catch bindings with _ to satisfy the no-unused-vars rule
Use // eslint-disable-next-line svelte/prefer-svelte-reactivity for new URLSearchParams() used as local temporaries (not reactive state)

DB / Testing Architecture

All server modules import db from $lib/server/db/index.ts. In tests, _setDb() is used to inject an in-memory SQLite instance, bypassing the $env/dynamic/private SvelteKit virtual module entirely. Never call _setDb in production code.

SvelteKit virtual modules ($env/dynamic/private, $app/paths) are stubbed via path aliases in vitest.config.ts.

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