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kotlinlang

Why does gradle new configurations `api` exposes implementation details and `implementation` hides them? Why are the names confused?

you're understanding the terms in reverse :smile: `api` is the public stuff that should be "visible", `implementation` is private stuff which does not concern outside world, so it "hides them".

This feature was introduces, to avoid making your dependencies transitively public to all libraries which are using your lib.

I understand them corrcectly. If I declare dependency as `api A`, it should only put `A` in my code classpath, not `B` and `C` that `A` depends on, but it isn't the case.

you obviously don't, here are the docs: <https://docs.gradle.org/current/userguide/java_library_plugin.html>
it's not what you import, it's what you export. To avoid importing `B` and `C` you have to use `{ exclude() }`