A Hidden Circular Dependency Broke Our Production System — Here’s How We Prevented It Forever

A production deploy broke our entire order processing system. Error logs were filled with this: ReferenceError: OrderClass is not defined The strange part? The class clearly existed. The code had worked for months. After hours of debugging, we discovered the real problem: A circular dependency between multiple modules. Even worse — nothing in our code review process caught it. So I built an automated system to detect circular dependencies before they reach production. Medium Blog Link