Merge pull request #21 from reactjs/gaearon-patch-1

Add notes for June, 23

2016-06/june-23.md

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+## June 23 ([discuss](https://github.com/reactjs/core-notes/pull/21))
+
+### Attendees
+
+* [Ben](https://twitter.com/soprano) (React)
+* [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)
+* [Tom](https://twitter.com/tomocchino) (React)
+
+### Update on `createClass` → ES classes
+
+* [Dan](https://twitter.com/dan_abramov) finished working on a codemod for internal Facebook code that converts 800 files to remove one of the common mixins we used.
+* While doing so, Dan found an issue with inconsistent order of resolving refs during updates.
+* Ideally code should not depend on ref resolution order.
+* Unfortunately some Facebook components rely on it so for now we [fixed this in React](https://github.com/facebook/react/pull/7101).
+
+### JSON Test Renderer
+
+* [Ben](https://twitter.com/soprano) added a [new test renderer intended for snapshot testing](https://github.com/facebook/react/pull/6944).
+* For now, we don’t document it, as we might want to change the API.
+* We *don’t* want people to rely on the renderer output or test against JSON.
+* This renderer is *only* intended for comparing snapshots, not analyzing them.
+* It is also not clear how to dispatch events with it.
+* Jest plans to add a guide on using it later on [its blog](https://facebook.github.io/jest/blog/) after it is more stable.
+
+### Update on 15.2.0
+
+* We cut the RC last week and React Native RC uses it.
+* It contains a lot of commits but not too many substantial changes.
+* Will be released within two weeks.
+
+### Update on Release Process
+
+* [Paul](https://twitter.com/zpao) started writing a maintainer’s guide to document the entire release process.
+* He ran the 15.2.0 RC release using a new tool he’s working on.
+* The process relies on us assigning semver labels (e.g. “major”, “patch”) but not specific milestones.
+* The tool will automate the release process based on those labels.
+* This should enable us to cut releases more often and let other people (e.g. React Native members) do it.
+
+### Fast Path
+
+* This is a hypothetical optimization [Jim](http://github.com/jimfb) wanted to try.
+* What if we took functional components that render only to DOM components and precompiled them to fast path “templates”?
+* This could be an optimization specific to the DOM renderer. It would use `document.createElement` or `cloneNode()`.
+* However most components use other components so it’s unclear if there are any benefits to doing this.
+* [Sebastian](https://twitter.com/sebmarkbage) had a more generic idea about component folding but it requires whole program analysis.
+* There is nothing conclusive here and this is not something we actively investigate.
+
+### Testing with Feature Flags
+
+* We currently test server rendering by enabling the client side renderer to do server side rendering ([we set `useCreateElement` to `false` and re-run the suite](https://github.com/facebook/react/blob/24dfb56113a214d98f29f69e2c26f67d7e947067/.travis.yml#L80-L81)).
+* We’d like to decouple client side from server side rendering.
+* [Sebastian](https://twitter.com/sebmarkbage)’s experimental “Fiber” reconciler does not yet support server rendering.
+* We need to split out server rendering before switching to Fiber.
+
+### Update on [Fiber](https://github.com/facebook/react/pulls?q=is%3Apr+fiber+is%3Aclosed)
+
+* This is [Sebastian](https://twitter.com/sebmarkbage)’s work on [new core algorithm](https://github.com/facebook/react/issues/6170).
+* Its main goal is to render tree in chunks to avoid dropping frames on large updates.
+* It sort of works but far from feature parity.
+* Need to add support for a lot of things: lifecycle, refs, state.
+* It should be possible to keep `ReactDOM` and `ReactDOMFiber` separate.
+* It would be great to test it in isolation on a single product.
+
+### Flow with Property Initializers
+
+[Jeff](https://twitter.com/lbljeffmo) will release a Flow version that infers the types from the initializers so we can write the types inline instead of specifying the type of the whole expression:
+
+```js
+class Foo {
+  doStuff = (x: number): boolean => {
+    return true;
+  };
+}
+```
+
+------------
+
+Please feel free to discuss these notes in the [corresponding pull request](https://github.com/reactjs/core-notes/pull/21).