Migrating to Next.js 15: big wins, small gotchas
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TL;DR Next.js 15 delivers massive developer-velocity wins (stable Turbopack in dev, React 19 support, Partial Prerendering) but introduces two migration hotspots: async request-scoped APIs (cookies(), headers(), params, searchParams) and inverted fetch/GET caching defaults. Enable Turbopack, audit request-scoped APIs for awaits, and make caching explicit route-by-route. Why we upgraded: measurable dev experience gains We flipped our monorepo to Next.js 15 and felt an immed