- If your code base utilizes dependency injection to make the code more "testable" with mocks, you are making the code 10x worse. There are other ways to make your code more modular without injecting new scope, logic and apis into an object.
Dependency Injection is one form of composition. One perspective to look at it, is that objects are like tiny scoped programs with variables and methods. To do a dependency injection is to put a program within a program.
Is this a good way to compose primitives? It's like parsing a python program inside a java program inside javascript. What are other ways to manage complexity and compose primitives without dependencies everywhere? What is a programming primitive? Is the most fundamental primitive of computing a function? Should we be composing bricks to form buildings or compose buildings to form bigger buildings?