In Next.js 15.4 we've added import traces for compiler errors to Turbopack. A big improvement for developer experience as well as coding with AI agents. The import trace is now aware of Server Components and Client Components. It also shows what environment the error happened in like Browser or SSR for Client Components. This makes it easier to know if e.g. a library is failing to compile only in the SSR environment. It's also a big help for AI agents as now it has better awareness of the module graph. For example when it makes edits that introduce `useState` it can now determine the best place to introduce `"use client"`, instead of always putting it on the specific file being edited.
