Upgrade to React 16

This is going to be non-trivial. Hopefully not a big deal either.

For those salivating and pining in anticipating for this, I hope to get it done this month but no promises (I have a family to support).

Also it will come out in v1.2.0. Before then there’ll be a minor release still on React 15.

Edit: Not committing to a timeline but these are the changes:

Changes & Progress

• New render return types
  • arrays
  • strings
  • numbers
  • portals
  • null (how does sjr handle this? should we bother supporting it anyway?) – don’t support; THIS. IS. SCAALAAA!
  • EmptyVdom (Scala version of above)
  • boolean (to support JS syntax bool && expr - should we support this? it’s ≈ null, even when true) – don’t support; THIS. IS. SCAALAAA!
  • Option[_] (Scala version of above)
  • fragments
• Fragments
• Portals
  • ReactDOM.createPortal
  • React.Children support for portals (https://github.com/facebook/react/issues/11373)
• “Error boundaries”
  • componentDidCatch
• React Addons have been discontinued
  • react-addons-test-utils is now react-dom/test-utils
  • perf doesn’t work with 16 - no replacement yet
  • react-addons-css-transition-group is now react-transition-group, a separate lib
• Deprecated now removed
  • createClass
• VDOM
  • Allow on as a custom attribute for AMP. https://github.com/facebook/react/issues/11153
  • Remove VdomElement? – Nope, still needed by ReactDOM
• Other
  • New rules for Keys
  • New rules for Refs
  • getDOMNode should now return Element | Text instead of just Element
  • Refresh vdom builder prod-mode logic
  • Refresh component builder logic
  • componentDidUpdate lifecycle no longer receives prevContext param. See https://github.com/facebook/react/issues/8631 (Don’t think sjr is affected)
  • Remember to test module paths with sjs-bundler – wasted enough time trying to get fragile bundler to even run my tests
  • Depends on requestAnimationFrame (even in test environments). Might need shim: import 'raf/polyfill'

Externalised

• #448 - Calling setState with null no longer triggers an update.
• #449 - Update docs

[japgolly]

Hi all. I’ve setup a patreon page. If you would like to contribute and are able, I’d really appreciate your support. If you know any one else that enjoys this project, my other OSS libraries, or even my programming blog enough to support me and could reach out to them, that would be tremendously helpful too. Thank you! 🙇‍♂️

[japgolly]

Two tasks externalised (#448 #449) but otherwise: done! 🎉