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The Wiki Education Dashboard is a Ruby on Rails / React.js web app for organizing Wikipedia classroom assignments and other group editing activities. Before beginning this task, you should have set up a development environment https://github.com/WikiEducationFoundation/WikiEduDashboard/blob/master/docs/setup.md (see for example the "Set up the Wiki Education Dashboard development environment" task).

The no-undef rule is very useful for catching errors. However, it will require some configuration and/or inline exceptions to handle the globals in the codebase.

You are expected to provide a Pull Request.