6 Safe Refactorings for Untested Legacy Code

Refactoring code without tests is risky. But to write tests, you often need to refactor the code first. How do you deal with that paradox?

I will show how to reduce the risk, even when missing tests. We will focus on refactorings I’ve found particularly useful when dealing with legacy codebases. You may know some names but probably don’t know the proper moves. Let me teach you how I do it.

Examples will be in TypeScript.