Given a snippet like this:
import {Foo} from 'testing-mod';
const bar = new Foo();
bar.method();If this was a real project and you didn't install the package testing-mod using something like yarn add testing-mod
typescript can't know method type. It will report method as any.
This is vital to know if typescript Symbols are related to other symbols.
In this case, if the dependencies were installed, we could easily get the method definition and ask
its parent which will be reported as Foo.
If dependencies were not installed method declaration would be any and you could not get its parent.