Previously our automatic React injection approach injected `import React from 'react'` automatically whenever JSX was detected. The new official JSX transform solves this by enforcing importing `React` when it is used.
This codemod automatically converted files that are using a "global React variable" to use `import React from 'react'`
Largely based on the code @threepointone wrote for react-codemod.
Co-Authored-By: Sunil Pai <threepointone@gmail.com>
Co-authored-by: Sunil Pai <threepointone@gmail.com>
