How to use an imported package without duplicating imports?

Question

go

2 files: main.go and sum.go.
When importing any third party package in main, I don't see it in sum and vice versa.
How to import 1 time and use in all files of my package?

Answer 1

So intended. An imported package is only visible in the file it is imported into. This is not a bug, but a feature)) This is documented.