Nextjs Validator

What it does

This skill validates Next.js projects to ensure adherence to Next.js 16 best practices and prevent the use of deprecated patterns found in earlier versions (v15 and below). It analyzes project configuration files and directory structures, flagging inconsistencies that could lead to issues or hinder performance. The tool helps maintain a modern and efficient Next.js development environment by enforcing current standards.

When to use it

• When setting up a new Next.js project.
• Before starting any significant development work on a Next.js application.
• During audits of existing Next.js projects to identify outdated patterns.
• After an AI assistant generates Next.js code, to ensure compatibility and adherence to best practices.
• As part of a CI/CD pipeline for automated validation.

Key capabilities

• Checks the next package version (must be v16 or higher).
• Validates the use of proxy.ts instead of deprecated middleware.ts.
• Ensures correct App Router directory structure (app/) and flags usage of the deprecated pages/ directory.
• Verifies proper implementation of caching using 'use cache'.
• Confirms Server Actions are implemented correctly with 'use server'.
• Checks for Turbopack configuration (default in Next.js 16).
• Prefers TypeScript config files (next.config.ts) over JavaScript (next.config.js).

Example prompts

• "Validate my Next.js project against version 16 standards."
• "Run the Next.js validator on this directory: ./src/app"
• "Check for deprecated patterns in my Next.js code."

Tips & gotchas

• The skill requires Python 3 to be installed and accessible.
• It is intended to enforce Next.js 16 compatibility, so projects using older versions may receive numerous warnings or errors.
• Use the --strict flag for a more thorough validation process.