facebook/flow v0.163.0

on GitHub

New Features:

• The deprecated * type is now an alias to any. You can use flow codemod replace-existentials, which is available in previous versions of Flow, to upgrade your codebase to not use *. This codemod command will not be available in the current or future versions of Flow.
• Add (experimental) codemod to annotate variables that cause constrained write errors in future Flow versions.
• Add (experimental) codemod rename variable names that are reused with different types.
• Add --include-comments and --include-locs flags to the flow ast command.
• Add $ObjMapConst<O, T> builtin type, alias for $ObjMap<O, () => T>.

Notable bug fixes:

• Fix bug in $KeyMirror so that it respects the optionality of its arguments.
• Type JSON as object rather than a class. This prevents code such as new JSON() which is a runtime error.

Library Definitions:

• Add InputEvent.dataTransfer
• Declare AggregateError class - fixes #8764 (thanks @lachlanhunt).
• Improve UIEvent, InputEvent and KeyboardEvent types.

Misc:

• Fix typo in CONTRIBUTING.md (thanks @jereef).
• Clarify comments for ConcretizeTypeAppsT logic after Subtyping_kit refactor (thanks gnprice).

Parser:

• Fix a bug that allowed comments after the # in private identifiers.