Thought I'd post my React Conf notes here for anyone who is interested!
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New! Prerelease channels: In order to support other library and framework devs, and to enlist early feedback, the React team is debuting 3 new prerelease channels: Latest (stable), Next (on-deck for stable release, but doesn't adhere to semver and may intro breaking changes), and Experimental (caution! likely to contain large and breaking changes). Latest is the only channel recommended for user-facing applications.
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New! Experimental release of Concurrent Mode: Concurrent Mode supports interruptible rendering, including suspending render in components whose data has not yet returned (Suspense API). I got a glimpse of SuspenseList in action in the context of rendering a list of photos from a remote source and it was pretty neat - I think there's a lot to be excited for here, especially for mobi