Exmaple repo, showing a tree-shaking issue of internal files.

• ./api.js creates two api interfaces, one user server side serverApi and another one for client side clientApi
• server side api interface should not be exposed in the client side bundle
• looking at ./.next/static/chunks/pages/index-f70e66cea4cef052.js, both serverApi and clientApi are bundled in the client side code

I've noticed this issue when using axios, but this example replicates the issue without.

p.s. The ./api.js file has some commented out code that helped analyzing the issue.

Try out yourself

• Do changes (or not)
• Run npm run build
• Search for your "server-needle" in the ./.next/static/chuunks/ directory. (E.g. in my case i searched for the I should only be available server side. text)