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.

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