v0.97.0

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.

Misc:

• 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.

Parser:

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