facebook/flow v0.162.0

on GitHub

Likely to cause new Flow errors:

• As part of our work on Local Type Inference, unannotated variables now require a non-null value to be assigned to them at some point in the program. If a variable is intentionally only null, it can be annotated with null (let x: null = null); if only undefined, then it can be annotated with void (let x: void;).
• Function and class names can no longer be reassigned, even when not exported
• Fix positioning of [missing-type-arg] errors

New Features:

• Add $Partial utility type. This utility converts all of an object's or interface's named fields to be optional, while maintaining all the object's other properties (exactness, sealedness, etc).

Notable bug fixes:

• Improve performance of strict_es6_import_export
• Fix an infinite recheck loop when deleting a file when using saved state
• Fix a bug where the server would stop after running a CLI command if the server was starting with --autostop

Misc:

• Type import.meta as object
• Fix jsdoc support on imported declare function
• Make string literal autocomplete obey format.single_quotes setting
• Improve reliability of "refactor" code actions