How to safely use React context

Context is a very powerful feature in React, with lots of disclaimers around it. A bit like the forbidden fruit in paradise. That should be enough to keep you far away from context right? Well of course not, it is a (unsupported) React feature, and forbidden features will be used for the mere fact that they exist! Context makes it possible to pass data to components deep in the component tree with

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React Contextを安全に使う方法。