EXCEL2JSON/CLAUDE.md

CLAUDE.md

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

Project Overview

excel2json — a SvelteKit web application for converting Excel files to JSON. Built with Svelte 5, SvelteKit 2, TypeScript, and Tailwind CSS 4.

Commands

• npm run dev — start dev server
• npm run build — production build
• npm run preview — preview production build
• npm run check — type-check with svelte-check
• npm run test — run all tests once
• npm run test:unit — run tests in watch mode
• npm run test:unit -- --run --testNamePattern="pattern" — run a single test by name

Architecture

• Framework: SvelteKit 2 with Svelte 5 (runes API: $state, $props, $derived, etc.)
• Styling: Tailwind CSS 4 with @tailwindcss/forms and @tailwindcss/typography plugins, configured via src/routes/layout.css
• Adapter: @sveltejs/adapter-auto
• TypeScript: strict mode enabled

Testing

Two Vitest project configurations in vite.config.ts:

• client — browser tests using Playwright (headless Chromium). Files matching src/**/*.svelte.{test,spec}.{js,ts}. Uses vitest-browser-svelte for component rendering.
• server — Node.js unit tests. Files matching src/**/*.{test,spec}.{js,ts} (excluding .svelte. test files).

All tests require assertions (expect.requireAssertions: true).

Key Conventions

• Svelte components use lang="ts" in script tags
• Shared library code goes in src/lib/ (aliased as $lib)
• Use Svelte 5 runes syntax, not legacy Svelte 4 patterns

Svelte MCP Server

A Svelte MCP server is available for Svelte 5 / SvelteKit documentation lookup and code validation. When writing Svelte code:

1. Use list-sections first to discover relevant documentation
2. Use get-documentation to fetch needed sections
3. Use svelte-autofixer to validate Svelte code before finalizing — keep calling until no issues remain
4. Offer playground-link only if code was NOT written to project files