I have a Lerna monorepo that consists of two packages: myapp-web and myapp-core. Each of those packages have top-level src/ dirs to hold their code.
I want to be able to import myapp-core/src/some-subdir as myapp-core/some-subdir (similar to how you'd do an import to lodash/effects or lodash/fp) inside of myapp-web (that is, I want to avoid including the src/ part).
I know you can set the entry point in the main prop of package.json. Can I do something analogous but manifesting the directories I want to make available from outside the package? Do I need to make named exports from the main file and require picks those up as myapp-core/some-export?
The only way to do this is to move the files from src/ to the root of you project. However you can set this up to happen on publish. That way you keep your source files in src/ and exclude them from your published package. That's what lodash and others do.
This is not unique to monorepos.