While working on yet another React project using
As it turns out, React’s practice of having different code for “development mode” and “production” is being used by other projects from community members, but not with the same level of caution – for this tooling to work, the build steps need to use specific configuration: https://facebook.github.io/react/docs/package-management.html.
Not all projects mention this, and more importantly not all projects warn you if you don’t. The solution? Configure your build step to remove those development aids in the entire bundle, and not just your own code.
Other related links for future reference: