IE11 React 15.4 issue

[DimitryDushkin]

On IE11 I got error:

 Objects are not valid as a React child (found: object with keys {$$typeof, type, key, ref, props, _owner, _store}). If you meant to render a collection of children, use an array instead or wrap the object using createFragment(object) from the React add-ons. Check the render method of `RedBoxError`.

Wonder why it's problem only in IE...

[davidpfahler]

Do you understand what that error is supposed to mean in context of Redbox?

[DimitryDushkin]

Looks like for some reason https://github.com/commissure/redbox-react/blob/master/src/index.js#L72 returns object
I really do not understand why.

Possible problem is in react-hot-load.

[davidpfahler]

Weird. IE11 is kind of hard for me to debug, but I am happy to review PRs.

[nickw444]

Also having this same issue

Nevermind, I was running "react": "^15.0.2", updated to 15.4.0, and it's all good now.

And I just restarted webpack and i'm back in the same situation...

[gaearon]

Appears related: facebook/react#8379.
Can you share a reproducing example?

[DimitryDushkin]

It's not redbox related. Adding Symbol polyfill is the fix — https://github.com/thejameskyle/babel-react-optimize/issues/16#issuecomment-263519239

[davidpfahler]

@DimitryDushkin Thanks!

[gaearon]

As for IE11 problem, also see this: facebook/react#8379 (comment).