Next.js Advanced Routing

Overview

Provide comprehensive guidance for advanced Next.js App Router features including Route Handlers (API routes), Parallel Routes, Intercepting Routes, Server Actions, error handling, draft mode, and streaming with Suspense.

TypeScript: NEVER Use any Type

CRITICAL RULE: This codebase has @typescript-eslint/no-explicit-any enabled. Using any will cause build failures.

❌ WRONG:

function handleSubmit(e: any) { ... }
const data: any[] = [];