JavaScript boy and “lovely thoughtleader” 
he/him 
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Pros of globals: - You'll be requiring them anyway - Easier for a test runner to inject Cons: - Globals introduces more environment variance - Have to explicitly tell your linter/typechecker that they're valid globals
You wont have a consistent environment. Globals will be available in one environment (the one your tests run in), and your production one (where your normal code runs). It's not really an issue with globals because you can't really accidentaly refer to them.
Jest also adds an `expect` global (and maybe others?).
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