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Promote "React must be in scope" to be an error

Merged Administrator requested to merge github/fork/gaearon/promote-jsx-scope-error into master

Created by: gaearon

I think this is better to surface early because it’s a common mistake and will lead to broken code in 100% cases.

Test plan:

  1. Remove React from imports in App.js
  2. See the overlay:
screen shot 2016-10-02 at 18 57 54

The error is googleable and leads here.