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CLAUDE.md

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

Project Overview

Next SEO is a plugin that makes managing SEO easier in Next.js projects. It's built with TypeScript and provides components for structured data (JSON-LD) and SEO management.

Critical Rules

You must check these after coming up with a plan [ ] Your plan adheres to the guide found in @ADDING_NEW_COMPONENTS.md [ ] Your plan adheres to the guidelines found below

Development Commands

Installation

pnpm install

Build & Development

pnpm dev          # Watch mode with tsup
pnpm build        # Build library code

Code Quality

pnpm lint         # Run ESLint
pnpm lint:fix     # Fix ESLint issues
pnpm format       # Format with Prettier
pnpm typecheck    # Type checking with TypeScript

Testing

pnpm test         # Run typecheck + lint only
pnpm test:unit    # Run unit tests with Vitest
pnpm test:unit:watch  # Watch mode for unit tests
pnpm coverage     # Generate coverage report
# Requires pnpm build to run first
pnpm test:e2e     # Run E2E tests with Playwright
pnpm test:e2e:ui  # Run E2E tests with UI

Example App

pnpm example:dev    # Run example app at localhost:3001
pnpm example:build  # Build example app
pnpm example:start  # Start example app

Utilities

pnpm clean        # Clean build artifacts

Project Architecture

Core Structure

  • /src - Library source code
    • /core - Core components like JsonLdScript
    • /types - TypeScript type definitions
    • /utils - Utility functions like stringify
  • /examples/app-router-showcase - Example Next.js app for testing
  • /tests - Test files
    • /unit - Unit tests (Vitest)
    • /e2e - E2E tests (Playwright)

Build Configuration

  • tsup - For building the library (see tsup.config.ts)
  • Outputs both CommonJS and ESM formats
  • Path alias: ~ maps to ./src

Testing Setup

  • Vitest - Unit testing with React Testing Library
  • Playwright - E2E testing running against example app on port 3001
  • Tests use ~ alias for imports

Development Notes

  1. All library code is in /src directory
  2. The project uses pnpm workspaces with the example app
  3. When developing, the example app auto-starts on port 3001 for E2E tests
  4. Lint and format are automatically run on staged files via Husky
  5. The library exports both CommonJS and ESM formats with TypeScript definitions
  6. When adding a new component ALWAYS refer to the guide found in ADDING_NEW_COMPONENTS.md

Key Patterns

@type Optional Pattern

Next SEO provides excellent developer experience by never requiring developers to manually specify @type properties. This is achieved through intelligent type definitions and process functions.

How It Works:

  1. Type Definitions: Component props use Omit<Type, "@type"> to make @type optional
  2. Process Functions: Automatically add the correct @type based on the input
  3. Flexible Inputs: Accept strings, objects with/without @type, and arrays

Example:

// Developers can write this:
<ArticleJsonLd
  author="John Doe"  // Simple string
  publisher={{ name: "ACME Corp", logo: "logo.jpg" }}  // No @type needed
/>

// Process functions transform it to valid Schema.org:
{
  author: { "@type": "Person", name: "John Doe" },
  publisher: { "@type": "Organization", name: "ACME Corp", logo: {...} }
}

Benefits:

  • Better DX: No need to remember Schema.org type names
  • Less Boilerplate: Cleaner, more readable code
  • Type Safety: Full TypeScript support maintained
  • Flexibility: Still accepts objects with @type if provided

Implementation Rules:

  1. Always use process functions for properties accepting flexible types
  2. Never require @type in component props
  3. Use intelligent detection (e.g., logo property → Organization)
  4. Provide sensible defaults in process functions

This pattern is fundamental to the library's design and must be maintained in all components.