I almost shipped a small feature-flag helper that worked on my laptop and crashed in the clean Docker image. The generated source looked self-contained, and my local smoke test gave the exact boolean I expected, so I assumed the problem was the deployment environment. It was not.
Source: [Dev.to](https://dev.to/codepy_1473/the-generated-helper-passed-locally-then-died-in-a-clean-container-because-it-read-a-global-i-1l4l)