These are musings related to the question what kind of libraries resist the test of time. Some of it is related to issues encountered due to Dependency Hell. Explicit dependency Let us start out by asking the question, what is an explicit dependency in your software? How should we define a dependency? The easiest way to define a dependency would be there is an explicit package reference to a library. If you can remove the package reference, does the code still work? In order to make it clear, let us def[...]