Add May 26 notes

2016-05/may-26.md

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+## May 26 ([discuss](https://github.com/reactjs/core-notes/pull/17))
+
+### Attendees
+
+* [Ben](https://twitter.com/soprano) (React)
+* [Christopher](https://twitter.com/vjeux) (React Native)
+* [Dan](https://twitter.com/dan_abramov) (React)
+* [Jim](http://github.com/jimfb) (React)
+* [Keyan](https://twitter.com/keyanzhang) (React, intern)
+* [Paul](https://twitter.com/zpao) (React)
+* [Sebastian](https://twitter.com/sebmarkbage) (React)
+* [Shayne](https://github.com/shayne) (React Native)
+* [Tom](https://twitter.com/tomocchino) (React)
+
+### ES2016 Classes
+
+#### Class Property Initializers ([proposal](https://github.com/jeffmo/es-class-fields-and-static-properties))
+
+* ES classes for React components don’t feel good without them.
+* We haven’t used them internally at Facebook enough to push externally.
+* For now, we’ll push for more internal adoption of ES classes.
+* We don’t want to hinder the proposal by pushing too hard for it now.
+* After the proposal is further along, we can update our internal code and start pushing externally.
+
+#### Documentation and Tutorial
+
+* We need to figure out how to make the docs reflect the fact that you can use either `createClass` or ES classes.
+* Proposal: the docs will continue to show `createClass` as the default, but will include a switcher to show examples using classes.
+* Eventually, we will flip the default.
+* In the tutorial we’ll start out introducing functional components (using function declarations).
+* [Dan](https://twitter.com/dan_abramov) and [Paul](https://twitter.com/zpao) will work on this.
+
+#### What About Mixins?
+
+* Technically you can use [this approach](https://www.npmjs.com/package/es6-react-mixins) for mixins with ES classes.
+* We won’t officially recommend it though because we think existing use cases for mixins have better solutions.
+* We’ll start by getting rid of mixins in the Facebook codebase.
+* Then we’ll write a page detailing how to get rid of different kinds of mixins.
+
+#### Higher Order Components ([article](https://medium.com/@dan_abramov/mixins-are-dead-long-live-higher-order-components-94a0d2f9e750))
+
+* They solve some of the mixin use cases.
+* We should post about them in the official React blog and/or documentation.
+* They have their own problems, such as not proxying methods.
+* One solution would be to [allow forwarding callback refs](https://github.com/facebook/react/issues/4213).
+* Not clear if we want this, but it would make higher order components more convenient to use.
+
+### `ReactTestUtils` and Incremental Reconciler
+
+* [Incremental reconciler](https://github.com/facebook/react/issues/6170) is going to be asynchronous.
+* However `ReactTestUtils.renderIntoDocument()` is synchronous.
+* It is not entirely clear if test utils should emulate a simpler always-sync environment, or real world.
+
+### Error Codes
+
+* [Keyan](https://twitter.com/keyanzhang) continues work on the PRs that let people decode error messages:
+  - [#6874](https://github.com/facebook/react/pull/6874)
+  - [#6882](https://github.com/facebook/react/pull/6882)
+
+------------
+
+Please feel free to discuss these notes in the [corresponding pull request](https://github.com/reactjs/core-notes/pull/17).