Module Code Organization
Learn efficient module code organization with protocol buffer APIs, composition root files, and internal packages to prevent unintended imports.
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Each of the modules that makes up our application exposes a protocol buffer API and a small module file that contains the composition root for the module code. The modules also have their internal packages to keep unintentional imports from being made between the modules.
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Internal package import rules
The above figure illustrates how the multiple internal packages help us manage our relationships and control the dependencies between the modules:
/root/internal: This package can be imported by/rootand any package found in the directory tree under it./root/pkg-b/internal: This package can only be imported by ...