v0.148.0

Likely to cause new Flow errors:

• We now error if the RHS of instanceof is not an object, e.g. x instanceof null. This catches 'instanceof' is not an object runtime errors.
• Using super outside of class methods, e.g. in arrow and function properties, is now an error.

Library Definitions:

• Add static from to stream$Readable (thanks @agalatan).

Notable bug fixes:

• Fixed autoimports to not suggest vars already in scope.
• Fixed autoimports to reuse existing imports if they exist.
• Fixed autoimports to correctly sort imports of the same name.
• Fixed null from being a subtype of an empty interface e.g. (null: interface {}) // Error (thanks @mrtnzlml for the report).

Misc:

• flow refactor experimental command removed. Instead, use the LSP textDocument/rename request.
• Removed the experimental.new_signatures flowconfig option as well as the --old-signatures opt-out command line flag.