Next.js (packages/next)

Control surfaces

Primary surface: Runtime Surface

• Runtime Surfacehigh

  86% of observed concentration

  src/server/config-shared · src/shared/lib/app-router-types · src/shared/lib/segment

• Data Surfacelow

  14% of observed concentration

  src/types

• Execution Flow Surfacelow

  0% of observed concentration

• Identity Surfacelow

  0% of observed concentration

• Messaging Surfacelow

  0% of observed concentration

Pay attention first

Top modules by fan-in — where engineering attention should go.

1. src/server/config-shared
2. src/shared/lib/app-router-types
3. src/shared/lib/segment
4. src/types