Created by: pugnascotia
I know server-rendering isn't supported, but I was tinkering with loading the production bundle in Nashorn, Java 8's JavaScript engine, and found that the Promise polyfill assumes that window exists. This PR changes the polyfill to attempt to use window first, and global secondly.
For the interested reader, global isn't defined in Nashorn either, but it can be easily defined in order to bring it in-line with Node.
Testing steps:
npm run create-react-app mytestapp
cd mytestapp
npm start
# App starts OK and renders in the browser
npm run build
# App builds successfully.
# Also need to change generated src/index.js to only mount React if document is defined
vim src/index.js
# Start Nashorn interpreter
jjs
> var global = {}
> load('build/static/js/main.26610bf4.js')
# File load without throwing an exception