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Next.js 16 stabilizes instrumentation.ts, removing the need for custom init wrappers. Learn how to wire OpenTelemetry, Sentry, and custom spans with direct SDK initialization, lifecycle guarantees, and production-ready patterns.

Most Claude Code refactors burn tokens on sequential file edits that wait for confirmation after each change. MultiEdit and Write tools eliminate the round-trip tax by bundling coordinated changes into a single transaction that preserves atomicity and cuts latency.

The `using` keyword eliminates resource leak footguns in production TypeScript. Learn how to implement disposable database connections, file handles, and async cleanup patterns that replace brittle try/finally blocks.