The more platforms a Flutter application supports, the more code a project can have that is needed only for one platform and not needed for others. How to make sure that unnecessary code does not get into the final platform-specific build? And how to check that it really did not get?

In Flutter, there is a Tree-shaking mechanism, which is designed exactly for these purposes. Many Flutter developers have heard about it, but not everyone really understands what it is and how it actually works. Let's try to figure it out.