IE8-10: Warning: Component(...): React component classes must extend React.Component.

[syranide]

Transpiled with babeljs. Not observed in modern browsers.

class Example extends React.Component {
  render() {
    return null;
  }
}

ReactDOM.render(
  React.createElement(Example),
  document.body
);

// Warning: Component(...): React component classes must extend React.Component.

It's possible this is actually an issue with babeljs, I'm not really sure.

cc @spicyj

[sophiebits]

I realized this last week and didn't get a chance to test it. Glad to know it's not entirely in my head. We'll figure out a fix.

[sophiebits]

Merging into #4990.

[jimfb]

@spicyj Merging into self? Is there a different issue you intended to link?

[sophiebits]

Thanks, I meant #4836.

[dtothefp]

@syranide @spicyj did this end up being an issue with Babel or React? I'm seeing the same warnings in IE9 using 0.14.0-rc1

PS I'm putting this issue here because my question is not related to scala-js

[sophiebits]

It hasn't been fixed. #4836 will have updates when it is (which will happen before 0.14).

[dtothefp]

@spicyj will this currently have any negative effect on production code or is it only a warning in NODE_ENV="development"?

I'm using the syntax

import React, {Component} from 'react';

class Whatevsss extends Component {

not sure if it is effected by just doing

class Whatevsss extends React.Component {

[sophiebits]

Both of those are fine. In prod mode we skip the check but your code will break in 0.15 if it's triggering the warning now.

[dtothefp]

@spicyj but the warning is due to issue resolved here #4836 correct? Any plan for release soon?