* Improve error message when not providing a value for key
* Update packages/babel-plugin-transform-react-jsx/src/create-plugin.js
Show location of attribute instead of only the path
Co-authored-by: Huáng Jùnliàng <jlhwung@gmail.com>
* Change error message to be less aggressive
* Throw error when runtime is "classic"
Co-authored-by: Huáng Jùnliàng <jlhwung@gmail.com>