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@facebook-github-bot facebook-github-bot released this Jan 31, 2019 · 538 commits to master since this release

Likely to cause new Flow errors:

Some fixes to tagged template literals will surface a new set of pre-existing errors!

New Features:

This release culminates months of hard work on quality of life improvements for IDE support.
Expect your requests to be faster, and your requests to take a bit less time.

  • Several Flow commands can run in parallel now, i.e. you can still get type definitions while rechecking.
    Big props to @gabelevi for this massive QoL improvement!
  • Alongside this change, @gabelevi also released a new lazy-check mode that leverages watchman to reduce the number of checked files.
    Learn about it in the docs.

Notable bug fixes:

Thank you to the opensource community for these fixes!

  • #7354 Fix MouseEvent type definitions
  • #7262 Update types for WeakMap
  • #7100 Add missing crypto.randomFillSync and crypto.randomFill methods
  • #7356 Add definitions for new debug hook useDebugValue
  • #7352 Rename React hook useImperativeMethods -> useImperativeHandle
  • #5665 Fix arity of clearInterval, clearTimeout
  • React.memo now accepts any kind of Component
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