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@facebook-github-bot facebook-github-bot released this Apr 12, 2019 · 64 commits to master since this release

Likely to cause new Flow errors:

  • Refining a variable of type mixed with instanceof A produces type A instead empty which was produced before.
  • Types imported in a declare module are no longer automatically exported from that module as well.

New Features:

  • #7518 Adds support for LSP function parameter completion (thanks @vicapow)

Notable bug fixes:

  • Return a better error message when flow coverage is passed an invalid input path.
  • Fixed a bug in which Flow crashed on very long directory paths.
  • Fixed type-at-pos results when reporting the type of a callable object.


  • Improvements in AST utilities: The differ got improved support in several kinds of type annotations (literals, generic identifiers, typeof, tuples and interface types). The mapper got support for qualified identifiers.
  • Introduces a resizable array data structure that is used in union-find.
  • Improved error messages around callable and indexer.
  • Type-at-pos now shows results without evaluating type destructors like object spread, $Diff, etc. This should lead to more compact results.
  • Various refactorings in the internal type language and environment.

Library definition improvements:

  • Updates in Node definitions. The stream definitions were updated to the latest version, and the readline.createInterface definitions were also updated.


  • #7471 Adds support for parsing of BigInt (Arbitrary precision integers) (thanks @goodmind)
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