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v0.31.0
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released this 19 Aug 20:13
v0.31.0
36f9aa4

Likely to cause new Flow errors:

  • Fixed an issue where an any type could actually prevent errors from showing up in places that actually should surface errors
  • Array.isArray() now refines arrays to Array<mixed> instead of Array<any>

New Features:

  • When the munge_underscores option is set, Flow no longer requires annotations on exported classes with munged methods. (thanks @pvolok!)
  • Added a new "magic" type called $PropertyType<T, 'x'>. This utility extracts the type of the property 'x' off of the type T.
  • It is now possible to use leading-| and & on any type annotation, not just in type aliases

Notable bug fixes:

  • Signficant perf improvements on checking disjoint unions
  • Fixed an issue where flow start would sometimes hang on Windows
  • Fixed an issue where flow get-def on a react element would always point to the internal react libdef (rather than the component that defines the element)
  • Error messages for builtin types are now more descriptive in more scenarios
  • Fixed the order in which destructured function params were processed. This previously caused issues with variable references within the destructuring
  • Error messages for union type errors now point to more helpful locations in some cases
  • Fixed a long-standing confusing error message blaming property accesses on the "global object" (when the global object isn't actually involved at all)
  • Improved error message when trying to import a named export from a module that only has a default export
  • Fixed an issue where Promise.resolve(undefined) would not always error as it should
  • Fixed an issue where async functions that return void do not properly enforce their return type
  • Fixed an issue where aliased object types may not error when an invalid property is accessed on them
  • Fix flow coverage when reporting coverage on empty files
  • Printed types in some circumstances (autocomplete, type-at-pos, etc) are now capped on size to prevent overflows in tools that consume them. When the size overflows the cap, ... will be printed as an overflow placeholder
  • Various built-in libdef updates
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