ReactDOM undefined with React 16

[cristianrosu]

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Hey there!
I've been successfully using react-rails but I'm now trying to use the gem with React 16 directly from master. Calling react_component in my views throws an error in react_ujs, more specifically in ReactDOM.render because ReactDOM is undefined.

I've been able to fix this by manually requiring react-dom before react_ujs but this should be handled by the gem.

Anyone else has this issue and maybe ideas how to properly fix it? Thanks ✌️

[BookOfGreg]

Yep agreed. If possible could you write a failing test? I recently wrote a test in #802 that checked for a JS error within the ruby test suite, if possible could you follow that example? https://github.com/reactjs/react-rails/blob/master/test/react/rails/react_rails_ujs_test.rb#L104-L107

[BookOfGreg]

Is this related to #747 ?
So far I've been unable to replicate it.

@cristianrosu and @yhkang95 can you provide a failing test or reproduction steps?

[BookOfGreg]

Closing for now. I'll reopen if I hear back. Thank you.