Heavy bundle dependency in serverless route

What it is

A serverless route imports a heavy dependency, inflating the function bundle.

Why it matters

Bundle size is cold-start latency, and cold starts land on real users during traffic ramps. On duration-billed functions you also pay for the initialisation every time a new instance starts.

How to fix it

Import the specific submodule rather than the package root, or load the dependency behind a dynamic import on the code path that needs it. Check the build output for what is actually in the bundle.