React 16.6.0 bug

[dlebedynskyi]

There seems to be an issue with react 16.6.0 -1 context api on server side render

getting following errors during render

Warning: Rendering <Context.Consumer.Provider> is not supported and will be removed in a future major release. Did you mean to render <Context.Provider> instead?
Warning: Rendering <Context.Consumer.Consumer> is not supported and will be removed in a future major release. Did you mean to render <Context.Consumer> instead?
Warning: Failed prop type: The prop `context` is marked as required in `Dispatcher`, but its value is `undefined`.
    in Dispatcher

TypeError: Cannot read property 'helmetInstances' of undefined

• Dispatcher.js:70 Dispatcher.init
  [id-portal-web]/[react-helmet-async]/lib/Dispatcher.js:70:48

• Dispatcher.js:116 Dispatcher.render
  [id-portal-web]/[react-helmet-async]/lib/Dispatcher.js:116:12

this seems to be happening because  of context consumer is initialized on first run with null values 

return _react2.default.createElement(
_Provider.Context.Consumer,
null,
function (context) {
// 👇 here
return _react2.default.createElement(_Dispatcher2.default, _extends({}, newProps, { context: context }));
}
);

I had similar issues on other Context using packages with server sider render. 

[dlebedynskyi]

after additional investigation, I found that problem is actually in react-async-component. Closing PR as not relevant

[mschipperheyn]

@dlebedynskyi Any suggestions on how you fixed the issue? Running into it myself

[dlebedynskyi]

@mschipperheyn
I just ripped off react-async-component and replaced with https://github.com/smooth-code/loadable-components.

Core issues for me was null passed to provider on SSR. that was a bug in react-async-component.

[mschipperheyn]

I did the same and I still have the same error :-(

The error is caused I think by react-async-bootstrapper

[mschipperheyn]

You should reference ctrlplusb/react-async-bootstrapper#14

[aseem2625]

Similar issue:
I tried integrating with repo and development built is working fine, however, while serving the production built app, throws at server itself.

Warning: Failed prop type: The prop `context` is marked as required in `Dispatcher`, but its value is `undefined`.
    in Dispatcher
UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'helmetInstances' of undefined

[kishankanugula]

@aseem2625 I am also facing the same issue. Did you find any solution? Thank you for any help.