facebook/flow v0.212.0

on GitHub

Likely to cause new Flow errors:

• Flow is now stricter with regards to type checking of spreads, $NonMaybeType, and $ReadOnly. You might see new errors revealed as a result.
• Experimental utility types $Pred and $Refine have been deleted. These are replaced by type guards.

New Features:

• Updated Pick and Omit to work on interfaces and instances.
• Conditional types, mapped types, type guards, and tuple enhancements are now enabled by default.

Notable bug fixes:

• Prevented hover and go-to-definition requests that infinitely loop.

IDE:

• For imported names using require, go-to-definition will now jump to the location of the original definition's name.